Linked Life Data

12823545

Source:http://linkedlifedata.com/resource/pubmed/id/12823545

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
13
pubmed:dateCreated
2003-6-25
pubmed:databankReference
pubmed:abstractText
We have isolated and characterized a second [Fe]-hydrogenase gene from the green alga, Chlamydomonas reinhardtii. The HydA2 gene encodes a protein of 505 amino acids that is 74% similar and 68% identical to the known HydA1 hydrogenase from C. reinhardtii. HydA2 contains all the conserved residues and motifs found in the catalytic core of the family of [Fe]-hydrogenases. We demonstrate that both the HydA1 and the HydA2 transcripts are expressed upon anaerobic induction, achieved either by neutral gas purging or by sulfur deprivation of the cultures. Furthermore, the expression levels of both transcripts are regulated (in some cases differently) by incubation conditions, such as the length of anaerobiosis, the readdition of O2, the presence of acetate, and/or the absence of nutrients such as sulfate during growth. Antibodies specific for HydA2 recognized a protein of about 49 kDa in extracts from anaerobically induced C. reinhardtii cells, strongly suggesting that HydA2 encodes for an expressed protein. Homology-based 3D modeling of the HydA2 hydrogenase shows that its catalytic site models well to the known structure of Clostridium pasteurianum CpI, including the H2-gas channel. The major differences between HydA1, HydA2 and CpI are the absence of the N-terminal Fe-S centers and the existence of extra sequences in the algal enzymes. To our knowledge, this work represents the first systematic study of expression of two algal [Fe]-hydrogenases in the same organism.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0014-2956
pubmed:author
pubmed:issnType
Print
pubmed:volume
270
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2750-8
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Expression of two [Fe]-hydrogenases in Chlamydomonas reinhardtii under anaerobic conditions.
pubmed:affiliation
National Renewable Energy Laboratory, Golden, CO 80401, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't