Linked Life Data

15744766

Source:http://linkedlifedata.com/resource/pubmed/id/15744766

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2005-4-13
pubmed:abstractText
The effect on the heme environment upon unfolding Paracoccus versutus ferricytochrome c-550 and two site-directed variants, K99E and H118Q, has been assessed through a combination of peroxidase activity increase and one-dimensional NMR spectroscopy. At pH 4.5, the data are consistent with a low- to high-spin heme transition, with the K99E mutation resulting in a protein with increased peroxidase activity in the absence of or at low concentrations of denaturant. Furthermore, the mobility of the polypeptide chain at pH 4.5 for the wild-type protein has been monitored in the absence and presence of denaturant through heteronuclear NMR experiments. The results are discussed in terms of local stability differences between bacterial and mitochondrial cytochromes c that are inferred from peroxidase activity assays. At pH 7.0, a mixture of misligated heme states arising from protein-based ligands assigned to lysine and histidine is detected. At low denaturant concentrations, these partially unfolded misligated heme forms inhibit the peroxidase activity. Data from the K99E mutation at pH 7.0 indicate that K99 is not involved in heme misligation, whereas histidine coordination is proven by the data from the H118Q variant.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1439-4227
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
747-58
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
The effects of ligand exchange and mobility on the peroxidase activity of a bacterial cytochrome c upon unfolding.
pubmed:affiliation
Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't