Luo Haiwei

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Luo
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Haiwei
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  • Preprint
    Cryptic carbon and sulfur cycling between surface ocean plankton
    ( 2014-12) Durham, Bryndan P. ; Sharma, Shalabh ; Luo, Haiwei ; Smith, Christa B. ; Amin, Shady A. ; Bender, Sara J. ; Dearth, Stephen P. ; Van Mooy, Benjamin A. S. ; Campagna, Shawn R. ; Kujawinski, Elizabeth B. ; Armbrust, E. Virginia ; Moran, Mary Ann
    About half the carbon fixed by phytoplankton in the ocean is taken up and metabolized by marine bacteria, a transfer that is mediated through the seawater dissolved organic carbon (DOC) pool. The chemical complexity of marine DOC, along with a poor understanding of which compounds form the basis of trophic interactions between bacteria and phytoplankton, have impeded efforts to identify key currencies of this carbon cycle link. Here, we used transcriptional patterns in a bacterial-diatom model system based on vitamin B12 auxotrophy as a sensitive assay for metabolite exchange between marine plankton. The most highly upregulated genes (up to 374-fold) by a marine Roseobacter clade bacterium when co-cultured with the diatom Thalassiosira pseudonana were those encoding the transport and catabolism of 2,3- dihydroxypropane-1-sulfonate (DHPS). This compound has no currently recognized role in the marine microbial food web. As the genes for DHPS catabolism have limited distribution among bacterial taxa, T. pseudonana may use this novel sulfonate for targeted feeding of beneficial associates. Indeed, DHPS was both a major component of the T. pseudonana cytosol and an abundant microbial metabolite in a diatom bloom in the eastern North Pacific Ocean. Moreover, transcript analysis of the North Pacific samples provided evidence of DHPS catabolism by Roseobacter populations. Other such biogeochemically important metabolites may be common in the ocean but difficult to discriminate against the complex chemical background of seawater. Bacterial transformation of this diatom-derived sulfonate represents a new and likely sizeable link in both the marine carbon and sulfur cycles.
  • Article
    Draft genome sequence of marine alphaproteobacterial strain HIMB11, the first cultivated representative of a unique lineage within the Roseobacter clade possessing an unusually small genome
    (Genomic Standards Consortium, 2014) Durham, Bryndan P. ; Grote, Jana ; Whittaker, Kerry A. ; Bender, Sara J. ; Luo, Haiwei ; Grim, Sharon L. ; Brown, Julia M. ; Casey, John F. ; Dron, Antony ; Florez-Leiva, Lennis ; Krupke, Andreas ; Luria, Catherine M. ; Mine, Aric ; Nigro, Olivia D. ; Pather, Santhiska ; Talarmin, Agathe ; Wear, Emma K. ; Weber, Thomas S. ; Wilson, Jesse M. ; Church, Matthew J. ; DeLong, Edward F. ; Karl, David M. ; Steward, Grieg F. ; Eppley, John ; Kyrpides, Nikos C. ; Schuster, Stephan ; Rappe, Michael S.
    Strain HIMB11 is a planktonic marine bacterium isolated from coastal seawater in Kaneohe Bay, Oahu, Hawaii belonging to the ubiquitous and versatile Roseobacter clade of the alphaproteobacterial family Rhodobacteraceae. Here we describe the preliminary characteristics of strain HIMB11, including annotation of the draft genome sequence and comparative genomic analysis with other members of the Roseobacter lineage. The 3,098,747 bp draft genome is arranged in 34 contigs and contains 3,183 protein-coding genes and 54 RNA genes. Phylogenomic and 16S rRNA gene analyses indicate that HIMB11 represents a unique sublineage within the Roseobacter clade. Comparison with other publicly available genome sequences from members of the Roseobacter lineage reveals that strain HIMB11 has the genomic potential to utilize a wide variety of energy sources (e.g. organic matter, reduced inorganic sulfur, light, carbon monoxide), while possessing a reduced number of substrate transporters.