Biochemical Characterization of a Dihydroneopterin Aldolase Used for Methanopterin Biosynthesis in Methanogens

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dc.contributorVirginia Techen
dc.contributor.authorWang, Yuen
dc.contributor.authorXu, Huiminen
dc.contributor.authorGrochowski, Laura L.en
dc.contributor.authorWhite, Robert H.en
dc.contributor.departmentBiochemistryen
dc.date.accessed2015-10-01en
dc.date.accessioned2015-11-28T21:53:46Zen
dc.date.available2015-11-28T21:53:46Zen
dc.date.issued2014-06-30en
dc.description.abstractThe gene encoding 7,8-dihydroneopterin aldolase (DHNA) was recently identified in archaea through comparative genomics as being involved in methanopterin biosynthesis (V. Crecy-Lagard, G. Phillips, L. L. Grochowski, B. El Yacoubi, F. Jenney, M. W. Adams, A. G. Murzin, and R. H. White, ACS Chem. Biol. 7:1807-1816, 2012, doi:10.1021/cb300342u). Archaeal DHNA shows a unique secondary and quaternary structure compared with bacterial and plant DHNAs. Here, we report a detailed biochemical examination of DHNA from the methanogen Methanocaldococcus jannaschii. Kinetic studies show that M. jannaschii DHNA possesses a catalytic capability with a k(cat)/K-m above 10(5) M-1 s(-1) at 70 degrees C, and at room temperature it exhibits a turnover number (0.07 s(-1)) comparable to bacterial DHNAs. We also found that this enzyme follows an acid-base catalytic mechanism similar to the bacterial DHNAs, except when using alternative catalytic residues. We propose that in the absence of lysine, which is considered to be the general base in bacterial DHNAs, an invariant water molecule likely functions as the catalytic base, and the strictly conserved His35 and Gln61 residues serve as the hydrogen bond partners to adjust the basicity of the water molecule. Indeed, substitution of either His35 or Gln61 causes a 20-fold decrease in k(cat). An invariant Tyr78 is also shown to be important for catalysis, likely functioning as a general acid. Glu25 plays an important role in substrate binding, since replacing Glu25 by Gln caused a >= 25-fold increase in K-m. These results provide important insights into the catalytic mechanism of archaeal DHNAs.en
dc.description.sponsorshipNational Science Foundationen
dc.description.sponsorshipMCB 0722787en
dc.description.sponsorship1120346en
dc.description.sponsorshipVirginia Tech Mass Spectrometry Incubatoren
dc.description.sponsorshipVirginia Tech. Fralin Life Science Instituteen
dc.description.sponsorshipAgricultural Experiment Station Hatch Programen
dc.description.sponsorshipVA-135981en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationWang, Yu, et al. (2014). Biochemical Characterization of a Dihydroneopterin Aldolase Used for Methanopterin Biosynthesis in Methanogens. Journal of Bacteriology, 196(17), 3191-3198. doi:10.1128/jb.01812-14en
dc.identifier.doihttps://doi.org/10.1128/jb.01812-14en
dc.identifier.issn0021-9193en
dc.identifier.urihttp://hdl.handle.net/10919/64210en
dc.identifier.urlhttp://jb.asm.org/content/196/17/3191en
dc.language.isoenen
dc.publisherAmerican Society for Microbiologyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.titleBiochemical Characterization of a Dihydroneopterin Aldolase Used for Methanopterin Biosynthesis in Methanogensen
dc.title.serialJournal of Bacteriologyen
dc.typeArticle - Refereeden
dc.typeDataseten
dc.type.dcmitypeTexten
dc.type.dcmitypeDataseten

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