Proteomic Analysis of Stationary Phase in the Marine Bacterium “Candidatus Pelagibacter ubique”

ABSTRACT “Candidatus Pelagibacter ubique,” an abundant marine alphaproteobacterium, subsists in nature at low ambient nutrient concentrations and may often be exposed to nutrient limitation, but its genome reveals no evidence of global regulatory mechanisms for adaptation to stationary phase. High-resolution capillary liquid chromatography coupled online to an LTQ mass spectrometer was used to build an accurate mass and time (AMT) tag library that enabled quantitative examination of proteomic differences between exponential- and stationary-phase “Ca. Pelagibacter ubique” cells cultivated in a seawater medium. The AMT tag library represented 65% of the predicted protein-encoding genes. “Ca. Pelagibacter ubique” appears to respond adaptively to stationary phase by increasing the abundance of a suite of proteins that contribute to homeostasis rather than undergoing a major remodeling of its proteome. Stationary-phase abundances increased significantly for OsmC and thioredoxin reductase, which may mitigate oxidative damage in “Ca. Pelagibacter,” as well as for molecular chaperones, enzymes involved in methionine and cysteine biosynthesis, proteins involved in ρ-dependent transcription termination, and the signal transduction enzyme CheY-FisH. We speculate that this limited response may enable “Ca. Pelagibacter ubique” to cope with ambient conditions that deprive it of nutrients for short periods and, furthermore, that the ability to resume growth overrides the need for a more comprehensive global stationary-phase response to create a capacity for long-term survival.

[1]  R. Guillard,et al.  Relative value of ten genera of microorganisms as foods for oyster and clam larvae , 1958 .

[2]  R. R. Colwell,et al.  Viable but Non-Culturable Vibrio cholerae and Related Pathogens in the Environment: Implications for Release of Genetically Engineered Microorganisms , 1985, Bio/Technology.

[3]  R. Kolter,et al.  surA, an Escherichia coli gene essential for survival in stationary phase , 1990, Journal of bacteriology.

[4]  L. Sun,et al.  Escherichia coli ribonucleotide reductase expression is cell cycle regulated. , 1992, Molecular biology of the cell.

[5]  C. Georgopoulos,et al.  The ClpX heat‐shock protein of Escherichia coli, the ATP‐dependent substrate specificity component of the ClpP‐ClpX protease, is a novel molecular chaperone. , 1995, The EMBO journal.

[6]  C. Gutierrez,et al.  Growth‐phase‐dependent expression of the osmotically inducible gene osmC of Escherichia coli K‐12 , 1996, Molecular microbiology.

[7]  R. Kolter,et al.  SurA assists the folding of Escherichia coli outer membrane proteins , 1996, Journal of bacteriology.

[8]  T. Takemoto,et al.  Different mechanisms of thioredoxin in its reduced and oxidized forms in defense against hydrogen peroxide in Escherichia coli. , 1998, Free radical biology & medicine.

[9]  S. Foster,et al.  The Staphylococcus aureus alternative sigma factor sigmaB controls the environmental stress response but not starvation survival or pathogenicity in a mouse abscess model. , 1998, Journal of bacteriology.

[10]  S. Foster,et al.  The Staphylococcus aureus Alternative Sigma Factor ςB Controls the Environmental Stress Response but Not Starvation Survival or Pathogenicity in a Mouse Abscess Model , 1998 .

[11]  P. Reichard,et al.  Ribonucleotide reductases. , 1998, Annual review of biochemistry.

[12]  J. Seol,et al.  ATP‐dependent degradation of SulA, a cell division inhibitor, by the HslVU protease in Escherichia coli , 1999, FEBS letters.

[13]  M. Ehrmann,et al.  A Temperature-Dependent Switch from Chaperone to Protease in a Widely Conserved Heat Shock Protein , 1999, Cell.

[14]  K. Tanaka,et al.  The HslU ATPase acts as a molecular chaperone in prevention of aggregation of SulA, an inhibitor of cell division in Escherichia coli , 2000, FEBS letters.

[15]  A. Gruss,et al.  Lactococcus lactis, a bacterial model for stress responses and survival. , 2000, International journal of food microbiology.

[16]  D. Barofsky,et al.  An exponential dilution gradient system for nanoscale liquid chromatography in combination with MALDI or Nano-ESI mass spectrometry for proteolytic digests , 2001, Journal of the American Society for Mass Spectrometry.

[17]  A. F. Kelly,et al.  Survival of Campylobacter jejuniduring Stationary Phase: Evidence for the Absence of a Phenotypic Stationary-Phase Response , 2001, Applied and Environmental Microbiology.

[18]  J. Yates,et al.  Large-scale analysis of the yeast proteome by multidimensional protein identification technology , 2001, Nature Biotechnology.

[19]  J. Helmann,et al.  Bacterial Ohr and OsmC paralogues define two protein families with distinct functions and patterns of expression. , 2001, Microbiology.

[20]  Timothy D. Veenstra,et al.  AN ACCURATE MASS TAG STRATEGY FOR QUANTITATIVE AND HIGH THROUGHPUT PROTEOME MEASUREMENTS , 2002 .

[21]  Alexey I Nesvizhskii,et al.  Empirical statistical model to estimate the accuracy of peptide identifications made by MS/MS and database search. , 2002, Analytical chemistry.

[22]  M. A. Strauch,et al.  Bacillus subtilis sporulation and stationary phase gene expression , 2002, Cellular and Molecular Life Sciences CMLS.

[23]  John Quackenbush Microarray data normalization and transformation , 2002, Nature Genetics.

[24]  William A. Siebold,et al.  SAR11 clade dominates ocean surface bacterioplankton communities , 2002, Nature.

[25]  S. Giovannoni,et al.  Cultivation of the ubiquitous SAR11 marine bacterioplankton clade , 2002, Nature.

[26]  D. Nikolov,et al.  Structural and functional features of the Escherichia coli hydroperoxide resistance protein OsmC , 2003, Protein science : a publication of the Protein Society.

[27]  Gordon A Anderson,et al.  Use of artificial neural networks for the accurate prediction of peptide liquid chromatography elution times in proteome analyses. , 2003, Analytical chemistry.

[28]  J. Gowrishankar,et al.  Host factor titration by chromosomal R-loops as a mechanism for runaway plasmid replication in transcription termination-defective mutants of Escherichia coli. , 2003, Journal of molecular biology.

[29]  I. Poquet,et al.  HtrA is a key factor in the response to specific stress conditions in Lactococcus lactis. , 2003, FEMS microbiology letters.

[30]  Roberto Kolter,et al.  Escherichia coli evolution during stationary phase. , 2004, Research in microbiology.

[31]  Richard D. Smith,et al.  Application of peptide LC retention time information in a discriminant function for peptide identification by tandem mass spectrometry. , 2004, Journal of proteome research.

[32]  R. Malmstrom,et al.  Contribution of SAR11 Bacteria to Dissolved Dimethylsulfoniopropionate and Amino Acid Uptake in the North Atlantic Ocean , 2004, Applied and Environmental Microbiology.

[33]  B. Sjöberg,et al.  Two Proteins Mediate Class II Ribonucleotide Reductase Activity in Pseudomonas aeruginosa , 2005, Journal of Biological Chemistry.

[34]  M. Noordewier,et al.  Genome Streamlining in a Cosmopolitan Oceanic Bacterium , 2005, Science.

[35]  D. Chatterji,et al.  Evaluation of the role of sigma B in Mycobacterium smegmatis. , 2005, Biochemical and biophysical research communications.

[36]  M. Gelfand,et al.  Identification of a bacterial regulatory system for ribonucleotide reductases by phylogenetic profiling. , 2005, Trends in genetics : TIG.

[37]  S. Fuchs,et al.  Proteome analyses of Staphylococcus aureus in growing and non-growing cells: a physiological approach. , 2005, International journal of medical microbiology : IJMM.

[38]  J. Beckwith,et al.  Ribonucleotide reductases: influence of environment on synthesis and activity. , 2006, Antioxidants & redox signaling.

[39]  M. Singer,et al.  Role of (cid:2) D in Regulating Genes and Signals during Myxococcus xanthus Development , 2006 .

[40]  Katherine H. Huang,et al.  Temporal Transcriptomic Analysis as Desulfovibrio vulgaris Hildenborough Transitions into Stationary Phase during Electron Donor Depletion , 2005, Applied and Environmental Microbiology.

[41]  Samuel Kaplan,et al.  Application of the accurate mass and time tag approach to the proteome analysis of sub-cellular fractions obtained from Rhodobacter sphaeroides 2.4.1. Aerobic and photosynthetic cell cultures. , 2006, Journal of proteome research.

[42]  Ronald J Moore,et al.  Chemically etched open tubular and monolithic emitters for nanoelectrospray ionization mass spectrometry. , 2006, Analytical chemistry.

[43]  K. Guillemin,et al.  The Stringent Response Is Required for Helicobacter pylori Survival of Stationary Phase, Exposure to Acid, and Aerobic Shock , 2006, Journal of bacteriology.

[44]  Fred Heffron,et al.  Analysis of the Salmonella typhimurium Proteome through Environmental Response toward Infectious Conditions* , 2006, Molecular & Cellular Proteomics.

[45]  S. Gomes,et al.  A Caulobacter crescentus Extracytoplasmic Function Sigma Factor Mediating the Response to Oxidative Stress in Stationary Phase , 2006, Journal of bacteriology.

[46]  L. Rothschild,et al.  Growth-phase dependent differential gene expression in Synechocystis sp. strain PCC 6803 and regulation by a group 2 sigma factor , 2007, Archives of Microbiology.

[47]  N. Samatova,et al.  Detecting differential and correlated protein expression in label-free shotgun proteomics. , 2006, Journal of proteome research.

[48]  Richard D. Smith,et al.  Advances in proteomics data analysis and display using an accurate mass and time tag approach. , 2006, Mass spectrometry reviews.

[49]  H. Fletcher,et al.  HtrA in Porphyromonas gingivalis can regulate growth and gingipain activity under stressful environmental conditions. , 2006, Microbiology.

[50]  I. Borovok,et al.  The Streptomyces NrdR Transcriptional Regulator Is a Zn Ribbon/ATP Cone Protein That Binds to the Promoter Regions of Class Ia and Class II Ribonucleotide Reductase Operons , 2006, Journal of bacteriology.

[51]  Stephen J. Callister,et al.  Normalization approaches for removing systematic biases associated with mass spectrometry and label-free proteomics. , 2006, Journal of proteome research.

[52]  R. Colwell,et al.  Ultrastructure of coccoid viable but non-culturable Vibrio cholerae. , 2007, Environmental microbiology.

[53]  B. Sclavi,et al.  Ribonucleotide reductase and the regulation of DNA replication: an old story and an ancient heritage , 2007, Molecular microbiology.

[54]  S. Giovannoni,et al.  SAR11 marine bacteria require exogenous reduced sulphur for growth , 2008, Nature.