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Search: WFRF:(Kamerlin Shina C. Lynn 1981 ) > Human Glycerol 3-Ph...

  • Mydy, Lisa S.SUNY Buffalo, Dept Struct Biol, Buffalo, NY 14203 USA (author)

Human Glycerol 3-Phosphate Dehydrogenase : X-ray Crystal Structures That Guide the Interpretation of Mutagenesis Studies

  • Article/chapterEnglish2019

Publisher, publication year, extent ...

  • 2019-01-14
  • AMER CHEMICAL SOC,2019
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-379583
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379583URI
  • https://doi.org/10.1021/acs.biochem.8b01103DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Human liver glycerol 3-phosphate dehydrogenase (hlGPDH) catalyzes the reduction of dihydroxyacetone phosphate (DHAP) to form glycerol 3-phosphate, using the binding energy associated with the nonreacting phosphodianion of the substrate to properly orient the enzyme-substrate complex within the active site. Herein, we report the crystal structures for unliganded, binary E.NAD, and ternary E.NAD.DHAP complexes of wild type hlGPDH, illustrating a new position of DHAP, and probe the kinetics of multiple mutant enzymes with natural and truncated substrates. Mutation of Lys120, which is positioned to donate a proton to the carbonyl of DHAP, results in similar increases in the activation barrier to hlGPDH-catlyzed reduction of DHAP and to phosphite dianion-activated reduction of glycolaldehyde, illustrating that these transition states show similar interactions with the cationic K120 side chain. The K120A mutation results in a 5.3 kcal/mol transition state destabilization, and 3.0 kcal/mol of the lost transition state stabilization is rescued by 1.0 M ethylammonium cation. The 6.5 kcal/mol increase in the activation barrier observed for the D260G mutant hlGPDH-catalyzed reaction represents a 3.5 kcal/mol weakening of transition state stabilization by the K120A side chain and a 3.0 kcal/mol weakening of the interactions with other residues. The interactions, at the enzyme active site, between the K120 side chain and the Q295 and R269 side chains were likewise examined by double-mutant analyses. These results provide strong evidence that the enzyme rate acceleration is due mainly or exclusively to transition state stabilization by electrostatic interactions with polar amino acid side chains.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Cristobal, Judith R.SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA (author)
  • Katigbak, Roberto D.SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA (author)
  • Bauer, PaulUppsala universitet,Science for Life Laboratory, SciLifeLab,Struktur- och molekylärbiologi(Swepub:uu)pauba337 (author)
  • Reyes, Archie C.SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA (author)
  • Kamerlin, Shina Caroline Lynn,1981-Uppsala universitet,Struktur- och molekylärbiologi,Science for Life Laboratory, SciLifeLab(Swepub:uu)lynka392 (author)
  • Richard, John P.SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA (author)
  • Gulick, Andrew M.SUNY Buffalo, Dept Struct Biol, Buffalo, NY 14203 USA (author)
  • SUNY Buffalo, Dept Struct Biol, Buffalo, NY 14203 USASUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA (creator_code:org_t)

Related titles

  • In:Biochemistry: AMER CHEMICAL SOC58:8, s. 1061-10730006-29601520-4995

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