Land Miriam L.

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Land
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Miriam L.
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  • Article
    Genome of the epsilonproteobacterial chemolithoautotroph Sulfurimonas denitrificans
    (American Society for Microbiology, 2007-12-07) Sievert, Stefan M. ; Scott, Kathleen M. ; Klotz, Martin G. ; Chain, Patrick S. G. ; Hauser, Loren J. ; Hemp, James ; Hugler, Michael ; Land, Miriam L. ; Lapidus, Alla ; Larimer, Frank W. ; Lucas, Susan ; Malfatti, Stephanie A. ; Meyer, Folker ; Paulsen, Ian T. ; Ren, Qinghu ; Simon, Jörg ; USF Genomics Class
    Sulfur-oxidizing epsilonproteobacteria are common in a variety of sulfidogenic environments. These autotrophic and mixotrophic sulfur-oxidizing bacteria are believed to contribute substantially to the oxidative portion of the global sulfur cycle. In order to better understand the ecology and roles of sulfur-oxidizing epsilonproteobacteria, in particular those of the widespread genus Sulfurimonas, in biogeochemical cycles, the genome of Sulfurimonas denitrificans DSM1251 was sequenced. This genome has many features, including a larger size (2.2 Mbp), that suggest a greater degree of metabolic versatility or responsiveness to the environment than seen for most of the other sequenced epsilonproteobacteria. A branched electron transport chain is apparent, with genes encoding complexes for the oxidation of hydrogen, reduced sulfur compounds, and formate and the reduction of nitrate and oxygen. Genes are present for a complete, autotrophic reductive citric acid cycle. Many genes are present that could facilitate growth in the spatially and temporally heterogeneous sediment habitat from where Sulfurimonas denitrificans was originally isolated. Many resistance-nodulation-development family transporter genes (10 total) are present; of these, several are predicted to encode heavy metal efflux transporters. An elaborate arsenal of sensory and regulatory protein-encoding genes is in place, as are genes necessary to prevent and respond to oxidative stress.
  • Article
    The genome of deep-sea vent chemolithoautotroph Thiomicrospira crunogena XCL-2
    (Public Library of Science (PLoS), 2006-11-14) Scott, Kathleen M. ; Sievert, Stefan M. ; Abril, Fereniki N. ; Ball, Lois A. ; Barrett, Chantell J. ; Blake, Rodrigo A. ; Boller, Amanda J. ; Chain, Patrick S. G. ; Clark, Justine A. ; Davis, Carisa R. ; Detter, Chris ; Do, Kimberly F. ; Dobrinski, Kimberly P. ; Faza, Brandon I. ; Fitzpatrick, Kelly A. ; Freyermuth, Sharyn K. ; Harmer, Tara L. ; Hauser, Loren J. ; Hugler, Michael ; Kerfeld, Cheryl A. ; Klotz, Martin G. ; Kong, William W. ; Land, Miriam L. ; Lapidus, Alla ; Larimer, Frank W. ; Longo, Dana L. ; Lucas, Susan ; Malfatti, Stephanie A. ; Massey, Steven E. ; Martin, Darlene D. ; McCuddin, Zoe ; Meyer, Folker ; Moore, Jessica L. ; Ocampo, Luis H. ; Paul, John H. ; Paulsen, Ian T. ; Reep, Douglas K. ; Ren, Qinghu ; Ross, Rachel L. ; Sato, Priscila Y. ; Thomas, Phaedra ; Tinkham, Lance E. ; Zeruth, Gary T.
    Presented here is the complete genome sequence of Thiomicrospira crunogena XCL-2, representative of ubiquitous chemolithoautotrophic sulfur-oxidizing bacteria isolated from deep-sea hydrothermal vents. This gammaproteobacterium has a single chromosome (2,427,734 base pairs), and its genome illustrates many of the adaptations that have enabled it to thrive at vents globally. It has 14 methyl-accepting chemotaxis protein genes, including four that may assist in positioning it in the redoxcline. A relative abundance of coding sequences (CDSs) encoding regulatory proteins likely control the expression of genes encoding carboxysomes, multiple dissolved inorganic nitrogen and phosphate transporters, as well as a phosphonate operon, which provide this species with a variety of options for acquiring these substrates from the environment. Thiom. crunogena XCL-2 is unusual among obligate sulfur-oxidizing bacteria in relying on the Sox system for the oxidation of reduced sulfur compounds. The genome has characteristics consistent with an obligately chemolithoautotrophic lifestyle, including few transporters predicted to have organic allocrits, and Calvin-Benson-Bassham cycle CDSs scattered throughout the genome.
  • Article
    Conserved synteny at the protein family level reveals genes underlying Shewanella species’ cold tolerance and predicts their novel phenotypes
    (Springer, 2009-10-03) Karpinets, Tatiana V. ; Obraztsova, Anna Y. ; Wang, Yanbing ; Schmoyer, Denise D. ; Kora, Guruprasad H. ; Park, Byung H. ; Serres, Margrethe H. ; Romine, Margaret F. ; Land, Miriam L. ; Kothe, Terence B. ; Fredrickson, James K. ; Nealson, Kenneth H. ; Uberbacher, Edward C.
    Bacteria of the genus Shewanella can thrive in different environments and demonstrate significant variability in their metabolic and ecophysiological capabilities including cold and salt tolerance. Genomic characteristics underlying this variability across species are largely unknown. In this study, we address the problem by a comparison of the physiological, metabolic, and genomic characteristics of 19 sequenced Shewanella species. We have employed two novel approaches based on association of a phenotypic trait with the number of the trait-specific protein families (Pfam domains) and on the conservation of synteny (order in the genome) of the trait-related genes. Our first approach is top-down and involves experimental evaluation and quantification of the species’ cold tolerance followed by identification of the correlated Pfam domains and genes with a conserved synteny. The second, a bottom-up approach, predicts novel phenotypes of the species by calculating profiles of each Pfam domain among their genomes and following pair-wise correlation of the profiles and their network clustering. Using the first approach, we find a link between cold and salt tolerance of the species and the presence in the genome of a Na+/H+ antiporter gene cluster. Other cold-tolerance-related genes include peptidases, chemotaxis sensory transducer proteins, a cysteine exporter, and helicases. Using the bottom-up approach, we found several novel phenotypes in the newly sequenced Shewanella species, including degradation of aromatic compounds by an aerobic hybrid pathway in Shewanella woodyi, degradation of ethanolamine by Shewanella benthica, and propanediol degradation by Shewanella putrefaciens CN32 and Shewanella sp. W3-18-1.
  • Article
    Genomics of an extreme psychrophile, Psychromonas ingrahamii
    (BioMed Central, 2008-05-06) Riley, Monica ; Staley, James T. ; Danchin, Antoine ; Wang, Ting Zhang ; Brettin, Thomas S. ; Hauser, Loren J. ; Land, Miriam L. ; Thompson, Linda S.
    The genome sequence of the sea-ice bacterium Psychromonas ingrahamii 37, which grows exponentially at -12C, may reveal features that help to explain how this extreme psychrophile is able to grow at such low temperatures. Determination of the whole genome sequence allows comparison with genes of other psychrophiles and mesophiles. Correspondence analysis of the composition of all P. ingrahamii proteins showed that (1) there are 6 classes of proteins, at least one more than other bacteria, (2) integral inner membrane proteins are not sharply separated from bulk proteins suggesting that, overall, they may have a lower hydrophobic character, and (3) there is strong opposition between asparagine and the oxygen-sensitive amino acids methionine, arginine, cysteine and histidine and (4) one of the previously unseen clusters of proteins has a high proportion of "orphan" hypothetical proteins, raising the possibility these are cold-specific proteins. Based on annotation of proteins by sequence similarity, (1) P. ingrahamii has a large number (61) of regulators of cyclic GDP, suggesting that this bacterium produces an extracellular polysaccharide that may help sequester water or lower the freezing point in the vicinity of the cell. (2) P. ingrahamii has genes for production of the osmolyte, betaine choline, which may balance the osmotic pressure as sea ice freezes. (3) P. ingrahamii has a large number (11) of three-subunit TRAP systems that may play an important role in the transport of nutrients into the cell at low temperatures. (4) Chaperones and stress proteins may play a critical role in transforming nascent polypeptides into 3-dimensional configurations that permit low temperature growth. (5) Metabolic properties of P. ingrahamii were deduced. Finally, a few small sets of proteins of unknown function which may play a role in psychrophily have been singled out as worthy of future study. The results of this genomic analysis provide a springboard for further investigations into mechanisms of psychrophily. Focus on the role of asparagine excess in proteins, targeted phenotypic characterizations and gene expression investigations are needed to ascertain if and how the organism regulates various proteins in response to growth at lower temperatures.