Beatty Lab

J. Thomas Beatty

Professor Emeritus


 

Emailj.beatty@ubc.ca
Publications: J. Thomas Beatty's Publications

Lab Tel: 604-822-9307
Lab Rm #: 4540 - 2350 Health Sciences Mall, Life Sciences Centre

Office Tel: 604-822-6896
Office Rm #: 4557 - 2350 Health Sciences Mall, Life Sciences Centre

 




 

Associated Departments

Research Groups

  • Bacterial Physiology
     

Research Interests

My laboratory's research activities are centered on the general areas of bacterial molecular biology, physiology and genetics, with an emphasis on the regulation of gene expression, and protein structure and function. Some of the techniques used are molecular cloning, gene fusions, site-directed mutagenesis, RNA analyses, and purification of proteins.


Most of the research in my laboratory is on photosynthetic bacteria. These organisms use membrane proteins that bind chlorophylls and other cofactors to capture light energy in the form of photons. In one such protein called the reaction center, the light energy excites chlorophyll electrons, which hop to nearby cofactors that form a chain across the membrane domain of the protein. The chain ends at a quinone where the acquisition of an electron is coupled with the uptake of a proton from the cytoplasm. These protons eventually accumulate outside the cytoplasmic membrane and drive ATP synthesis.


The crystal structures of several photosynthetic reaction centers and light-harvesting complexes have been solved and shown to be highly conserved. We are using this structural information to design site-directed mutagenesis experiments to address questions about how individual proteins bind to each other and to cofactors, and pathways of electron and proton transfer within and between protein complexes. The fundamental information gained from such studies can be used to inform approaches to harness photosynthetic protein electron transfer in applied electrical devices.


In collaboration with others, such as John Madden's group in the Department of Electrical and Computer Engineering http://www.ece.ubc.ca/~jmadden/, we are investigating the feasibility of using photosynthetic reaction centers in biophotovoltaic devices, in the hopes of creating inexpensive solar cells whose production consumes carbon dioxide. Such solar cells may be able to harvest and store energy in one simple device.


We are investigating the diversity and activities of photosynthetic bacteria in aquatic environments ranging from stratified lakes to deep ocean hydrothermal vents. The genetic potential of such organisms is exploited in synthetic biology approaches to engineer novel combinations of proteins with new light-harvesting properties.


Finally, we are also studying a novel bacteriophage-like genetic exchange element called the "gene transfer agent", or GTA. The production of GTA is controlled by changes in environmental conditions that are sensed by cellular signal transduction systems, which produce a burst of GTA production in the stationary phase of laboratory cultures. Production of GTA is lethal for the individual producing cell, but the percentage of producing cells in a population is strictly limited to about 1%. The bulk of the population differentiates to become competent to acquire DNA carried by GTA, which may change the phenotype of the recipient cell. The nature of the signal(s), and the identities and activities of regulatory factors are of great interest to us.

 

Gene Regulation

One area of research in our laboratory is on gene structure and expression in photosynthetic bacteria. We study changes in transcription initiation, mRNA processing and protein-protein interactions in response to environmental factors such as oxygen concentration and light intensity, and a newly discovered quorum sensing pathway.


The genomes of several species of purple photosynthetic bacteria are being sequenced, with complete or nearly complete sequences available at this time. We are using these and other DNA sequences to discover new genes, to investigate their regulation of expression, and the function of their protein products.

 

Photosynthetic Reaction Center

The crystal structures of several purple bacterial photosynthetic reaction centers and light-harvesting complexes have been solved and shown to be highly conserved. We are using this structural information to design and interpret site-directed mutagenesis experiments to address questions about how individual proteins bind to each other and to cofactors, and pathways of proton transfer within and between protein complexes.

 

Phototaxis

Phototaxis is an adaptive response that allows cells to move with respect to light. This oriented photoresponsive motility depends on the direction and wavelengths of incident light. R. capsulatus is known to be capable of photosensory flagellum-driven movements in liquid media in response to changes in light intensity. These movements, independent of light orientation, are not phototactic. Recently we have identified a novel form of solid-substrate photoresponsive motility in R. capsulatus resembling phototaxis. We are currently using computational, biochemical, and genetics techniques to investigate this phenomenon and characterize the components responsible for photoreception, signal transduction, and motility.

 

Gene Transfer Agent

We are also studying a novel bacteriophage-like genetic exchange element called the "gene transfer agent", or GTA. The production of GTA is controlled by changes in environmental conditions that are sensed by a cellular signal transduction system, which produces a burst of GTA production in the stationary phase of laboratory cultures. The nature of the signal(s), and the identities and activities of regulatory factors are of great interest to us.

 

Ecology of Purple Bacteria

Finally, we are investigating the diversity and ecological activities of photosynthetic bacteria in aquatic environments ranging from stratified lakes to deep ocean hydrothermal vents.

 

Funding Sources

Research in the Beatty group is supported by funding from the Candian Institutes of Health Research (CIHR) and the Natural Sciences and Engineering Research Council (NSERC).  Cedric Brimacombe is supported by a 4 year doctoral fellowship from UBC. Rafael Saer is supported by an NSERC PGS D scholarship. 

 


The membrane-bound purple bacterial photosystem


Purple bacterial photosynthetic membrane vesicles


The purple non-sulphur bacteria are not just purple. The picture shows how different strains and growth conditions can affect color (pigmentation) of the purple non-sulphur bacterium Rhodobacter capsulatus. Also included is the bacterium Rhodopseudomonas palustris. Cultures were grown in test tubes, and placed in a plastic rack for photography. From left to right: R. capsulatus strains SB1003 (aerobic), SB1003 (anaerobic), DE442 (aerobic), SB1003-Ph6 (anaerobic, unknown mutation), SB1003-Ph4 (aerobic, unknown mutation) and R. palustris strain CGA001 (anaerobic).
 


Beatty Lab Links

Arizona State University Photosynthesis Center

Department of Microbiology and Immunology (UBC)

Light-Harvesting in Bacterial Photosynthesis

Rhodopseudomonas palustris genome

The Purple Phototrophic Bacteria eBook

http://photobiology.info/Jones.html
 


Publications
 

2022

Roman Kogay, Sonja Koppenhöfer, J Thomas Beatty, Jens H Kuhn, Andrew S Lang, Olga Zhaxybayeva, Formal recognition and classification of gene transfer agents as viriforms, Virus Evolution, Volume 8, Issue 2, 2022, veac100, https://doi.org/10.1093/ve/veac100
 

2020

Bárdy P, Füzik T, Hrebík D, Pantůček R, Beatty JT, Plevka P (2020.) Structure and mechanism of DNA delivery of a gene transfer agent. Nat Commun. 2020;11(1):3034.

Jun, D, T Richardson-Sanchez, A Mahey, MEP Murphy, RC Fernandez, and JT Beatty (2020). Introduction of the menaquinone biosynthetic pathway into Rhodobacter sphaeroides and de novo synthesis of menaquinone for incorporation into heterologously expressed integral membrane proteins. ACS Synth Biol, doi: 10.1021/acssynbio.0c00066.


2019

Ding, H., M. P. Grüll, M. E. Mulligan, A. S. Lang, and J. T. Beatty (2019). Induction of Rhodobacter capsulatus gene transfer agent (RcGTA) gene expression is a bistable stochastic process repressed by an extracellular calcium-binding RTX protein homologue. J Bacteriol  e00430-19; doi: 10.1128/JB.00430-19.

Jun, D, JT Beatty, D Bizotto (2019). A highly-sensitive method to isolate photocurrent signals from large background redox currents on protein-modified electrodes. ChemElectroChem 6:2870–2875.  doi: 10.1002/celc.201900249.

Ding, H, R Saer, JT Beatty (2019). Porphyrin excretion resulting from mutation of a gene encoding a class I fructose 1,6-bisphosphate aldolase in Rhodobacter capsulatus. Frontiers Microbiol 10:301. doi: 10.3389/fmicb.2019.00301.


2018

Martin, W.F.  D.A. Bryant, J.T. Beatty (2018). A physiological perspective on the origin and evolution of photosynthesis. FEMS Microbiol Rev 42:205-231.

Jun, H. Singh, A. Mahmoudzadeh, F. Duong, J.D.W. Madden, J.T. Beatty (2018). In vivo assembly of a truncated H subunit mutant of the Rhodobacter sphaeroides photosynthetic reaction centre and direct electron transfer from the QA quinone to an electrode. Photosynth Res 137:227–239   PMID: 29524035.

AB Westbye, L Kater, C Wiesmann, H Ding, CK Yip and JT Beatty (2018). The protease ClpXP and the PAS-domain protein DivL regulate CtrA and gene transfer agent production in Rhodobacter capsulatus. Appl Environ Microbiol 84: e00275-18.

Carlson, M, JW Young, Z Zhao, L Fabre, D Jun, J Li, J Li, HS Dhupar, I Wason, AT Mills, JT Beatty, JS Klassen, I Rouiller, F Duong (2018). The Peptidisc, a simple method for stabilizing membrane proteins in detergent-free solution.  eLife;7:e34085 DOI: 10.7554/eLife.34085


2017

D. Jun, V. Huang, and JT Beatty (2017). Heterologous production of the photosynthetic reaction center and light harvesting 1 complexes of the thermophile Thermochromatium tepidum in the mesophile Rhodobacter sphaeroides and thermal stability of a hybrid core complex. Appl. Environ. Microbiol. 83: e01481-17.

Westbye, AB, JT Beatty, and AS Lang (2017). Guaranteeing a captive audience: coordinated regulation of gene transfer agent (GTA) production and recipient capability by cellular regulators. Curr Opin Microbiol 38:122-129.

Westbye, AB, ZR O’Neill, TR Schellenberg-Beaver, and JT Beatty (2017). Rhodobacter capsulatus gene transfer agent induction by nutrient depletion and the RNAP omega subunit. Microbiology 163:1355-136.

Lang, AS, AB Westbye, and JT Beatty (2017). The distribution, evolution, and roles of gene transfer agents (GTAs) in prokaryotic genetic exchange. Annu Rev Virology 4:87–104.

Takshi, A, H Yaghoubi, J Wang, D Jun, JT Beatty (2017). Electrochemical field-effect transistor utilization to study the coupling success rate of photosynthetic protein complexes to cytochrome c. Biosensors 7(2), 16; PMID: 28358305.

Yaghoubi, H, M Schaefer, S Yaghoubi, D Jun, R Schlaf, JT Beatty, A Takshi (2017). A ZnO nanowire bio-hybrid solar cell. Nanotechnology 28: PMID: 28029108.


2016

Pan JSaer RGLin SGuo ZBeatty JT, and NW Woodbury (2016). Electron transfer in bacterial reaction centers with the photoactive bacteriopheophytin replaced by a bacteriochlorophyll through coordinating ligand substitution. Biochemistry 55:4909−4918 PMID: 27478991.

Jankowiak, R, O Rancova, J Chen, A Kell, RG Saer, JT Beatty, and D Abramavicius (2016). Mutation-induced changes in the protein environment and site energies in the (M)L214G mutant of the Rhodobacter sphaeroides bacterial reaction center. J Phys Chem B, 120:7859-7871; PMID: 27458891 DOI: 10.1021/acs.jpcb.6b06151.

Kuchinski K, CA Brimacombe, AB Westbye, H Ding , JT Beatty (2016). The SOS response master regulator LexA regulates the gene transfer agent of Rhodobacter capsulatus and represses transcription of the signal transduction protein CckA. J Bacteriol. 2016 Feb 1. pii: JB.00839-15. [Epub ahead of print].

Westbye, AB, K Kuchinski, CK Yip, JT Beatty (2016). The gene transfer agent RcGTA contains head spikes needed for binding to the Rhodobacter capsulatus polysaccharide cell capsule. J Molec Biol 428(2 Pt B):477-91. doi: 10.1016/j.jmb.2015.12.010. Epub 2015 Dec 19.


2015

Brimacombe, CA, H Ding, JA Johnson, JT Beatty (2015). Homologues of genetic transformation DNA import genes are required for Rhodobacter capsulatus gene transfer agent recipient capability regulated by the response regulator CtrA. J. Bacteriol 197: 2653-2663

Yaghoubi, H, Lafalce, E, Jun, D, Jiang, X, Beatty, JT, Takshi, A (2015). Large photocurrent response and external quantum efficiency in bio-photoelectrochemical cells incorporating reaction center plus light harvesting complexes. Biomacromolecules 16:1112-1118    


2014

Cedric A. Brimacombe, Hao Ding and J. Thomas Beatty (2014). Rhodobacter capsulatus DprA is essential for RecA-mediated Gene Transfer Agent (RcGTA) recipient capability regulated by quorum-sensing and the CtrA response regulator. Molec Microbiol, accepted manuscript online | DOI: 10.1111/mmi.12628

Seyed M. Mirvakili, Joanna E. Slota, Ashwin R. Usgaocar, Ali Mahmoudzadeh, Daniel Jun, Mehr Negar Mirvakili, J. Thomas Beatty and John D. W. Madden (2014). Photoactive Electrodes Incorporating Electrosprayed Bacterial Reaction Centers. Advanced Funct published online: DOI: 10.1002/adfm.201400350

Dutta PK, Lin S, Loskutov A, Levenberg S, Jun D, Saer R, Beatty JT, Liu Y, Yan H, Woodbury NW. (2014). Reengineering the optical absorption cross-section of photosynthetic reaction centers. J Am Chem Soc. 4599-604 dx.doi.org/10.1021/ja411843k |.
 
Ding H, Moksa MM, Hirst M, Beatty JT (2014). Draft Genome Sequences of Six Rhodobacter capsulatus Strains, YW1, YW2, B6, Y262, R121, and DE442.  Genome Announc. 2. pii: e00050-14. doi: 10.1128/genomeA.00050-14.

Fixen, K. R., A. W. Baker, E. A. Stojković, J. T. Beatty, and C. S. Harwood (2014). Apo-bacteriophytochromes modulate bacterial photosynthesis in response to low light. Proc. Natl. Acad. Sci. USA 111:E237-44. doi: 10.1073/pnas.1322410111.

Saer, RG, Pan J, Hardjassa, A., Lin S., F.I. Rosell, A.G. Mauk, N.W. Woodbury, M.E. Murphy, and J.T. Beatty (2014). Structural and kinetic properties of Rhodobacter sphaeroides photosynthetic reaction centers containing exclusively Zn-coordinated bacteriochlorophyll as bacteriochlorin cofactors. Biochim Biophys Acta, 1837:366–374

Jun, D., Saer, R.G., Madden, J.D., and J.T. Beatty (2014). Use of new strains of Rhodobacter sphaeroides and a modified simple culture medium to increase yield and facilitate purification of the reaction centre.  Photosynth Res 120:197-205.    


2013

Westbye, A.B., Leung, M.M., Florizone, S., Taylor, T.A., Johnson, J.A., Fogg P.C., Beatty, J.T. (2013). Phosphate concentration and the putative sensor kinase protein CckA modulate cell lysis and release of the Rhodobacter capsulatus gene transfer agent.  J Bacteriol 195:5025-5040.

 Pan JSaer RGLin SGuo ZBeatty JT, and NW Woodbury (2013). The protein environment of the bacteriopheophytin anion modulates charge separation and charge recombination in bacterial reaction centers. J Phys Chem B. 117:7179–7189.

 Brimacombe CA, Stevens A, Jun D, Mercer R, Lang AS, and JT Beatty. (2013) Quorum-sensing regulation of a capsular polysaccharide receptor for the Rhodobacter capsulatus gene transfer agent (RcGTA). Mol Microbiol. 87:802-817.

 Saer, RG, A. Hardjasa, F.I. Rosell, A.G. Mauk, M.E. Murphy, J.T. Beatty (2013). Role of Rhodobacter sphaeroides photosynthetic reaction center residue M214 in the composition, absorbance properties, and conformations of HA and BA cofactors. Biochemistry 52:2206-2217.

 Vasilev, Cvetelin, Amanda A. Brindley, John D. Olsen, Rafael G. Saer, J. T. Beatty, and C. N. Hunter (2013). Nano-mechanical mapping of the interactions between surface-bound RC-LH1-PufX core complexes and cytochrome c2 attached to an AFM probe. Photosynth. Res. Published online 29 Mar.

 Leung, M.M., C.A. Brimacombe, and J. T. Beatty (2013). Transcriptional regulation of the Rhodobacter capsulatus response regulator ctrA gene. Microbiology 159:96-106 


2012

Yaghoubi H, Li Z, Jun D, Saer R, Slota JE, Beerbom M, Schlaf R, Madden JD, Beatty JT, and Takshi A. 2012. The role of gold-adsorbed photosynthetic reaction centers and redox mediators in the charge transfer and photocurrent generation in a bio-electrochemical cell. J. Phys. Chem. C. 116(47): 24868-77. http://pubs.acs.org/doi/abs/10.1021/jp306798p

Neupane B, Jaschke P, Saer R, Beatty JT, Reppert M, and Jankowiak R. 2012. Electron transfer in Rhodobacter sphaeroides reaction centers containing Zn-bacteriochlorophylls: a hole-burning study. J. Phys. Chem. B. 116(10): 3457-66 http://pubs.acs.org/doi/abs/10.1021/jp300304r

Leung, M.M., C.A. Brimacombe, and J. . Beatty (2012). Transcriptional regulation of the Rhodobacter capsulatus response regulator ctrA gene. In press, Microbiology

Lang, A.S., O. Zhaxybayeva, and J.T. Beatty (2012). Prokaryotic gene transfer agents. Nature Rev. Microbiol. 10:472-482.

Fogg, P.C.M., A. B. Westbye, and J.T. Beatty (2012). One for all or all for one: Heterogeneous expression and host cell lysis are key to gene transfer agent activity in Rhodobacter capsulatus. PLoS One, 7(8): e43772. doi:10.1371/journal.pone.0043772.

Mercer, R.G., M. Quinlan, A.R. Rose, S. Noll, J.T.Beatty and A.S. Lang (2012). Regulatory systems controlling motility and gene transfer agent production and release in Rhodobacter capsulatus. FEMS Microbiol Lett  331:53-62.

Zheng, Q., R. Zhang P.C.M. Fogg, J.T. Beatty and N. Jiao (2012). Gain and loss of phototrophic genes revealed by comparison of two Citromicrobium bacterial genomes. PLoS One 7(4): e35790. doi:10.1371/journal.pone.0035790.

Leung, M.M., C.A. Brimacombe, G. B. Spiegelman and J.T. Beatty (2012).The GtaR protein negatively regulates transcription of the gtaRI operon and modulates gene transfer agent (RcGTA) expression in Rhodobacter capsulatus. Molec. Microbiol. 83:759-774.


2011

Mahmoudzadeh A, Saer R, Jun D, Mirvakili SM, Takshi A, Iranpour B Oullet E, Lagally ET, Madden JDW, and Beatty JT. 2011. Photocurrent generation by direct electron transfer using photosynthetic reaction centres. Smart Mater. Struct. 20: 094019 http://iopscience.iop.org/0964-1726/20/9/094019

Fogg, P.C.M, A.P. Hynes, E. Digby; A.S. Lang; J.T. Beatty (2011). Characterization of a newly discovered Mu-like bacteriophage, RcapMu, in Rhodobacter capsulatus strain SB1003. Virology 421: 211–221.

Halsey,C.M, J. Xiong, O.O. Oshokoya, J.A. Johnson, S. Shinde, J.T. Beatty, G. Ghirlanda, R.D. JiJi, and J.W. Cooley (2011). Simultaneous observation of peptide backbone lipid solvation and a-helical structure by deep-UV resonance Raman spectroscopy. ChemBioChem 12:2125-2128.

Jaschke, P.R., A. Hardjasa, E.L. Digby, C.N. Hunter and J.T. Beatty. (2011) A BchD (Mg-chelatase) mutant of Rhodobacter sphaeroides synthesizes zinc-bacteriochlorophyll through novel zinc-containing intermediates. J. Biol. Chem. 286: 20313–20322.

Mahmoudzadeh, A. , R. Saer, D. Jun, S.M. Mirvakili, A. Takshi, B. Iranpour, J.D.W. Madden and J.T. Beatty (2011). Direct electron transfer in photosynthetic reaction center-based photovoltaic devices. Smart Material Struct. 20:094019.

Jaschke, P.R., R.G. Saer, S. Noll and J.T. Beatty (2011). Modification of the genome of Rhodobacter sphaeroides and construction of synthetic operons. Meth. Enzymol. 497:519-538.

Shelswell, K. and J.T. Beatty (2011). Coordinated, long-range, solid-substrate movement of the purple photosynthetic bacterium Rhodobacter capsulatus. PLoS ONE 6:e19646.


2010

Takshi A, Madden JDW, Mahmoudzadeh A, Saer R, and Beatty JT. 2010. A photovoltaic device using an electrolyte containing photosynthetic reaction centers. Energies 3(11): 1721-7 http://www.mdpi.com/1996-1073/3/11/1721

Takshi, A., J.D.W. Madden, A. Mahmoudzadeh, R. Saer and J.T. Beatty (2010). A photovoltaic device using an electrolyte containing photosynthetic reaction centers. Energies 3:1721-1727.

Mercer, R.G., S.J. Callister, M.S. Lipton, L. Pasa-Tolic, H. Strnad, V. Paces, J.T Beatty and A.S. Lang (2010). Loss of the response regulator CtrA causes pleiotropic effects on gene expression in Rhodobacter capsulatus but does not affect growth phase regulation.  J. Bacteriol. 192: 2701-2710.

Lang, A.S., C. Harwood, and J.T. Beatty (2010).  Evolutionary relationships among antenna proteins of purple phototrophic bacteria. In "Functional genomics and evolution of photosynthetic systems"; Burnap, R. and Vermaas, W. (eds), Springer, in press.

Leung, M.M., S.M. Florizone, T.A. Taylor, A.S. Lang and J.T. Beatty (2010). The gene transfer agent of Rhodobacter capsulatus. In "Recent Advances in Phototrophic Prokaryotes"; P.C. Hallenbeck (ed), Springer.

Lang, A.S. and J.T. Beatty (2010). Gene transfer agents and defective bacteriophages as sources of extracellular prokaryotic DNA.  In "Extracellular Nucleic Acids"; Y. Kikuchi and E. Rykova (eds), Springer.

Li, M., S. Noll and J.T. Beatty (2010).  Bacteriophytochrome-dependent regulation of light-harvesting complexes in Rhodopseudomonas palustris anaerobic cultures.  Curr. Microbiol. 61: 429-434.


2009

Lin, S., P.R. Jaschke, H. Wang, M. Paddock, A. Tufts, J.P. Allen, F.I. Rosell, G.A. Mauk, M. Okamura, N.W. Woodbury, and J.T. Beatty (2009). Electron transfer in the Rhodobacter sphaeroides reaction center assembled with zinc bacteriochlorophyll. Proc. Natl. Acad. Sci. USA. 106:8537-8542.

Jaschke, P.R., I. Drake and J.T. Beatty (2009). Modification of a French pressure cell to improve microbial cell disruption. Photosynth. Res. 102:95-97.

Hunter, C.N., F. Daldal, M. Thurnauer and J.T. Beatty (2009). Preface. In "The Purple Phototrophic Bacteria"; C.N. Hunter, F. Daldal, M. Thurnauer and J.T. Beatty (eds), Springer

Takshi, A., J.D. Madden and J.T. Beatty (2009).  Diffusion model for charge transfer from a photosynthetic reaction center to an electrode in a photovoltaic device. Electrochim. Acta 54:3806-3811.


2008

Oda, Y., F.W. Larimer, P.S.G. Chain, S. Malfatti, M.V. Shin, L.M. Vergez, L.Hauser, M.L. Land, S. Braatsch, J.T. Beatty, D.A. Pelletier, A.L. Schaefer and C.S. Harwood (2008). Multiple genome sequences reveal adaptations of a phototrophic bacterium to sediment microenvironments. Proc. Natl. Acad. Sci. USA 105:18543–18548.

Rathgeber, C., M. Lince, J. Alric, A.S. Lang, E. Humphrey, R.E. Blankenship, A. Verméglio, F.G. Plumley, C.L. Van Dover, J.T. Beatty, and V. Yurkov (2008). Vertical distribution and characterization of aerobic phototrophic bacteria at the Juan de Fuca Ridge in the Pacific Ocean. Photosynth. Res. 97:235-244.


2007

Jaschke, P. R., and J. T. Beatty (2007). The photosystem of Rhodobacter sphaeroides assembles with zinc-bacteriochlorophyll in a bchD (magnesium-chelatase) mutant. Biochemistry, 46:12491-12500.

Jaschke, P. R., H. N. LeBlanc, A. S. Lang, and J. T. Beatty (2007). The PucC protein of Rhodobacter capsulatus mitigates an inhibitory effect of light-harvesting 2 a and b proteins on light-harvesting complex 1. Photosynth. Res. 95:279-284.

Rathgeber, C., N. Yurkova, E. Stackebrandt, P. Schumann, E. Humphrey, J.T. Beatty, and V. Yurkov (2007). Porphyrobacter meromictus sp. nov., an appendaged bacterium that produces bacteriochlorophyll a. Curr Microbiol. 55:356-361.

Braatsch, S., J.A. Johnson, K. Noll, and J.T. Beatty (2007). The O2-responsive repressor PpsR2 but not PpsR1 transduces a light signal sensed by the BphP1 phytochrome in Rhodopseudomonas palustris CGA009. FEMS Microbiol. Lett. 272:60-64.

Lang, A.S., and J.T. Beatty (2007). Importance of widespread gene transfer agent genes in the a-proteobacteria. Trends Microbiol. 15:54-62.

Swingley, W.D, G. Sumedha, S.D. Mastrian, H.J.. Matthies,  Ji. Hao, H. Ramos, C.R. Acharya, A.L. Conrad, H.L. Taylor, L.C. Dejesa, M.K. Shah, M.E. O’Huallachain, M.T. Lince, R.E. Blankenship, J.T. Beatty, and J.W. Touchman (2007). The complete genome sequence of Roseobacter denitrificans reveals a mixotrophic as opposed to photosynthetic metabolism. J. Bacteriol. 189:683-690.


2006

Rathgeber, C., N. Yurkova, E. Stackebrandt, E. Humphrey, J.T. Beatty, and V. Yurkov (2006).  Metalloid reducing bacteria isolated from deep ocean hydrothermal vents of the Juan de Fuca Ridge,  Pseudoalteromonas telluritireducens sp. nov. and Pseudoalteromonas spiralis sp. nov. Current Microbiol. 53:449-456.

Aklujkar, M., R.C. Prince, and J.T. Beatty (2006). The photosynthetic deficiency due to puhC gene deletion in Rhodobacter capsulatus suggests a PuhC protein-dependent  process of RC/LH1/PufX complex reorganization. Arch. Biochem. Biophys. 454:59-71.

Braatsch, S., J. Bernstein, F. Lessner, J. Morgan, J. Liao, C. Harwood, and J.T. Beatty (2006). Rhodopseudomonas palustris CGA009 has two functional ppsR genes that each encodes a repressor of photosynthesis gene expression. Biochemistry 45:14441-14451.

VerBerkmoes, N. C., M. B. Shah, P. K. Lankford, D. A. Pelletier, M. B. Strader, D. L., Tabb, W. H. McDonald, J. W. Barton, G. B. Hurst, L. Hauser, B . H. Davison, J. T. Beatty, C. S. Harwood, F. R. Tabita, R. L. Hettich, and F. W. Larimer (2006). Determination and comparison of the baseline proteomes of the versatile microbe Rhodopseudomonas palustrisunder its major metabolic states. J. Proteome Res. 5:287-298.

Aklujkar, M., and J.T. Beatty (2006).  Investigation of Rhodobacter capsulatus PufX interactions in the core complex of the photosynthetic apparatus. Photosynth. Res. 88:159-171.

Beatty, J.T. (2006). On the natural selection and evolution of the aerobic phototrophic bacteria. In “Discoveries in Photosynthesis”; Govindjee, J.T. Beatty, H. Gest, and J.F. Allen (eds.), Springer Publishers.

Gest, H., Beatty, J.T., J.F. Allen, and Govindjee (2006). The encyclopedia of photosynthesis research. In “Discoveries in Photosynthesis”; Govindjee, H. Gest, J.T. Beatty, and J.F. Allen (eds.), Springer Publishers.


2005

Beatty, J.T., Overmann, J., Lince, M.T., Manske, A.K., Lang, A.S., Blankenship, R.E., Van Dover, C.L., Martinson, T.A., and G.F. Plumley (2005). An obligately photosynthetic bacterial anaerobe from a deep-sea hydrothermal vent.  Proc. Natl. Acad. Sci. USA 102: 9306-9310.

Aklujkar, M., and J.T. Beatty (2005).  The PufX protein of Rhodobacter capsulatus affects the properties of bacteriochlorophyll a and carotenoid pigments of light-harvesting complex 1. Arch Biochem. Biophys. 443:21-32.

Tuschak, C., M.M. Leung, J.T. Beatty, and J. Overmann (2005). The puf operon of the purple sulfur bacterium Amoebobacter purpureus: structure, transcription and phylogenetic analysis. Arch. Microbiol. 183:431–443.

Abresch, E.C., H.L.A. Axelrod, J.T. Beatty, J.A. Johnson, R. Nechushtai, and M.L. Paddock (2005). Characterization of a highly purified, fully active, crystallizable RC-LH1-PufX core complex from Rhodobacter sphaeroides.  Photosyn. Res. 86:61–70.

Shelswell, K.J, T.A. Taylor, and J.T. Beatty (2005). Photoresponsive flagellum-independent motility of the purple phototrophic bacterium Rhodobacter capsulatus. J. Bacteriol. 187:5040-5043.

Aklujkar, M., R.C. Prince, and J.T. Beatty (2005). The puhE gene of Rhodobacter capsulatus is needed for optimal transition from aerobic to photosynthetic growth and encodes a putative negative modulator of bacteriochlorophyll production. Arch. Biochem. Biophys 437:186-198.

Rathgeber, C., N. Yurkova, E. Stackebrandt, P. Schumann, J.T. Beatty, and V. Yurkov (2005). Roseicyclus mahoneyensis gen. nov., sp nov., an aerobic phototrophic bacterium isolated from a meromictic lake. Int. J. Syst. Evol. Biol. 55:1597-1603.

Aklujkar, M., R.C. Prince, and J.T. Beatty (2005). The PuhB protein of Rhodobacter capsulatus functions in photosynthetic reaction center assembly with a secondary effect on light-harvesting complex 1. J. Bacteriol. 182:5440-5447.


2004

Rathgeber, C., Beatty, J.T., and V. Yurkov (2004). Aerobic phototrophic bacteria: new evidence for the diversity, ecological importance and applied potential of this previously overlooked group. Photosyn. Res. 81:113–128.

Tuschak, C., Beatty, J.T., and J. Overmann (2004). Photosynthesis genes and LH1 proteins of Roseospirillum parvum 930I, a purple non-sulfur bacterium with unusual spectral properties. Photosyn. Res. 81:181 - 199.

Larimer, F., P. Chain, L. Hauser, J. Lamerdin, S. Malfatti, L. Do, M.L. Land, D.A. Pelletier, J.T. Beatty, A.S. Lang, F. R. Tabita, J.L. Gibson, T.E. Hanson, C. Bobst, J. Torres y Torres, C. Peres, F. Harrison, J. Gibson, and C. S. Harwood (2004). Complete genome sequence of the metabolically versatile phototrophic bacterium Rhodopseudomonas palustris.  Nature Biotechnol. 22:55-61.

Tehrani, A., and J.T. Beatty (2004). Effects of precise deletions in Rhodobacter sphaeroides reaction center genes on steady-state levels of reaction center proteins: A revised model for reaction center assembly. Photosyn. Res. 79:101-108.

Govindjee, Allen, J.F., and  J.T. Beatty (2004). Celebrating the millennium: historical highlights of photosynthesis research.  Photosyn. Res. 80:1-13

Abresch, E.C., Axelrod, H.L.A., Beatty, J.T., Johnson, J.A., Okamura, M.Y., Feher, G., and R. Nechustai (2004) Isolation and characterization of an active RCLH1 complex from Rhodobacter sphaeroides. Biophys. J. .86:146a.