Linked Life Data

14511892

Source:http://linkedlifedata.com/resource/pubmed/id/14511892

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2003-9-26
pubmed:abstractText
The complexes between copper(II) and four synthetic tetrapeptides bearing a single histidine residue within the sequence (AcHGGG, AcGHGG, AcGGHG and AcGGGH, respectively), have been investigated by potentiometric and spectroscopic methods (UV-Vis, circular dichroism and electron paramagnetic resonance). Potentiometric studies in the pH range 4-12 allowed identification and quantitative determination of the species present in solution for each copper-peptide complex. In all cases, upon raising pH, copper(II) coordination starts from the imidazole nitrogen of the His; afterwards three deprotonated amide nitrogens are progressively involved in copper coordination, except in the case of AcGHGG. Based on the potentiometric and spectroscopic results, detailed molecular structures are proposed for the dominant copper(II) tetrapeptide species existing in solution, either at neutral or alkaline pH. The structural consequences of the presence and of the location of a unique histidine residue within the tetrameric sequence are specifically analyzed. Results are discussed in relation to the modeling of copper(II) binding sites in proteins, particular emphasis being devoted to the copper complexes of the prion protein.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0162-0134
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
97
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
299-307
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Modeling of copper(II) sites in proteins based on histidyl and glycyl residues.
pubmed:affiliation
Department of Chemistry, University of Florence, via della Lastruccia 3, I-50019 Sesto Fiorentino, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't