Linked Life Data

12099832

Source:http://linkedlifedata.com/resource/pubmed/id/12099832

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2002-7-8
pubmed:abstractText
Resonance Raman spectroscopy was used to interrogate the heme active site of horseradish peroxidase (HRP) lyophilized in the presence and absence of the lyoprotectant poly(ethylene glycol) (PEG; FW 5000; 0-80% w/w) suspended in acetone, chloroform, or acetonitrile. In aqueous solution, Fe(3+)HRP is characterized by a five-coordinate high-spin (5-c HS) heme system. The structure of the heme-active site of HRP in all solvents is perturbed by co-lyophilization of HRP with PEG. Heme active site structural changes are consistent with coordination of water in the distal axial coordination site of the ferric heme iron and disruption of the hydrogen-bond network when the protein is lyophilized in the presence of PEG (>or=60% w/w) in all of the solvent systems studied. Similar active site structural changes were previously observed for HRP in benzene and attributed to a change in the reaction mechanism for HRP in benzene. (Mabrouk, P. A.; Spiro, T. G. J. Am. Chem. Soc. 1998, 120, 10303-10309.) Thus, PEG is proposed to increase the catalytic activity of HRP in nonaqueous media by locking the heme active site into a structure that functions through an alternative catalytic pathway in nonaqueous media.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1525-7797
pubmed:author
pubmed:issnType
Print
pubmed:volume
3
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
846-9
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:articleTitle
Raman evidence that the lyoprotectant poly(ethylene glycol) does not restore nativity to the heme active site of horseradish peroxidase suspended in organic solvents.
pubmed:affiliation
Department of Chemistry, Northeastern University, Boston, Massachusetts 02115, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.