Linked Life Data

18805424

Source:http://linkedlifedata.com/resource/pubmed/id/18805424

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2008-11-25
pubmed:databankReference
pubmed:abstractText
The hydrolysis of 1,4,5,6-tetrahydro-6-oxonicotinate to 2-formylglutarate is a central step in the catabolism of nicotinate in several Clostridia and Proteobacteria. This reaction is catalyzed by the novel enzyme enamidase, a new member of the amidohydrolase superfamily as indicated by its unique reaction, sequence relationship, and the stoichiometric binding of iron and zinc. A hallmark of enamidase is its capability to catalyze a two-step reaction: the initial decyclization of 1,4,5,6-tetrahydro-6-oxonicotinate leading to 2-(enamine)glutarate followed by an additional hydrolysis step yielding (S)-2-formylglutarate. Here, we present the crystal structure of enamidase from Eubacterium barkeri at 1.9 A resolution, providing a structural basis for catalysis and suggesting a mechanism for its exceptional activity and enantioselectivity. The enzyme forms a 222-symmetric tetramer built up by a dimer of dimers. Each enamidase monomer consists of a composite beta-sandwich domain and an (alpha/beta)(8)-TIM-barrel domain harboring the active site. With its catalytic binuclear metal center comprising both zinc and iron ions, enamidase represents a special case of subtype II amidohydrolases.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
1089-8638
pubmed:author
pubmed:issnType
Electronic
pubmed:day
26
pubmed:volume
384
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
837-47
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
The crystal structure of enamidase: a bifunctional enzyme of the nicotinate catabolism.
pubmed:affiliation
Philipps-Universität Marburg, Fachbereich Chemie, Marburg, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't