Document Detail

Electron spin resonance studies of the solution structure of vanadyl amino acid complexes and mixed ligand complexes of oxalate.
MedLine Citation:
PMID:  205278     Owner:  NLM     Status:  MEDLINE    
Esr and electronic spectra of complexes of the general composition VO(AA)2 and VO(ox)(AA) have been characterized; AA = gly, his, cys, pro, val, met, asp amino acids. Spectra of the formulation VO(ox)(LL) (with LL = imidazole plus monodentate oxalate, histamine plus monodentate oxalate, histidine, cysteine, 4-imidazolepropionic acid, mercaptopropionic acid, ethylenediamine and ethanolamine) have been used to deduce a self-consistent assignment of AL, a ligand donor additivity constant contribution to the observed hyperfine splitting, Aiso. Values of AL are sensitive to inductive effects in the ligand structure. The solution structures and likely coordination geometries of VO(his)2, and VO(cys)22-- are discussed. The role of the imidazole moiety as a sigma donor and sulfhydryl sulfur as a pi acceptor is observed in VO(AA)2 and VO(ox)(AA) complexes.
C R Johnson; R E Shepherd
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Bioinorganic chemistry     Volume:  8     ISSN:  0006-3061     ISO Abbreviation:  Bioinorg Chem     Publication Date:  1978  
Date Detail:
Created Date:  1978-06-28     Completed Date:  1978-06-28     Revised Date:  2000-12-18    
Medline Journal Info:
Nlm Unique ID:  1305411     Medline TA:  Bioinorg Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  115-32     Citation Subset:  IM    
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MeSH Terms
Amino Acids*
Electron Spin Resonance Spectroscopy
Molecular Conformation
Reg. No./Substance:
0/Amino Acids; 0/Ligands; 0/Oxalates; 7440-62-2/Vanadium

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