Crystal structure of Pseudomonas fluorescens mannitol 2-dehydrogenase: Evidence for a very divergent long-chain dehydrogenase family

Kathryn L. Kavanagh, Mario Klimacek, Bernd Nidetzky, David K. Wilson

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Mannitol 2-dehydrogenase from Pseudomonas fluorescens (pfMDH) is a secondary alcohol dehydrogenase that catalyzes the reversible NAD(P)-dependent oxidation of D-mannitol to D-fructose, D-arabinitol to D-xylulose, and D-sorbitol to L-sorbose. It is a member of the mostly prokaryotic family of long-chain mannitol dehydrogenases that so far includes 66 members. Unlike other alcohol and polyol dehydrogenases that utilize metal cofactors or a conserved active-site tyrosine for catalysis, an invariant lysine is the general base. The crystal structure of pfMDH in a binary complex with NAD(H) and a ternary complex with NAD(H) and D-mannitol have been determined to 1.7 and 1.8 Å resolution respectively. Comparison of secondary structure assignment to sequence alignments suggest the shortest members of this family, mannitol-1-phosphate 5-dehydrogenases, retain core elements but lack secondary structural components found on the surface of pfMDH. The elements predicted to be absent are distributed throughout the primary sequence, implying that a simple truncation or fusion did not occur. The closest structural neighbors are 6-phosphogluconate dehydrogenase, UDP-glucose dehydrogenase, N-(1-D-carboxyethyl)-L-norvaline dehydrogenase, and glycerol-3-phosphate dehydrogenase. Although sequence identity is only a barely recognizable 7-10%, conservation of secondary structural elements as well as homologous residues that are contributed to the active site indicates they may be related by divergent evolution.

Original languageEnglish (US)
Pages (from-to)551-558
Number of pages8
JournalChemico-Biological Interactions
Volume143-144
DOIs
StatePublished - Feb 1 2003

Keywords

  • Crystal structure
  • Long-chain dehydrogenase
  • Mannitol dehydrogenase
  • Molecular evolution
  • Polyol

ASJC Scopus subject areas

  • Toxicology

Fingerprint Dive into the research topics of 'Crystal structure of Pseudomonas fluorescens mannitol 2-dehydrogenase: Evidence for a very divergent long-chain dehydrogenase family'. Together they form a unique fingerprint.

Cite this