Document Detail

Electron microscope study on human ceruloplasmin.
MedLine Citation:
PMID:  489254     Owner:  NLM     Status:  MEDLINE    
Electron microscopy of human ceruloplasmin (CP) molecules revealed a few distinctive types of particle images. Analysis of these images allows to propose a tentative model for CP: six "subunits" (which we call domains) not much different in size are arranged with 32 point group pseudosymmetry. The determination of the number of polypeptides arising at the spontaneous specific proteolytic fragmentation of CP and their molecular weights conform with this assumption. The electrophoretic studies of the CP samples prepared both with and without potent proteolytic inhibitor, PMSF, revealed that CP is a single-chain protein with molecular weight of 130 000. Isolated and stored without PMSF the polypeptide chain of CP undergoes specific proteolytic cleavage which results in the appearance of polypeptides with molecular weights of 16 000, 48 000, and 64 000. The latter two polypeptides degradate to about two- and three-fold decreased molecular weights fragments, respectively. Therefore, the single polypeptide chain of CP contains at least five peptide bonds which are particularly susceptible to proteolytic attack and which connect six principal segments of the chain. The hydrolysis of these bonds results in liberation of the six fragments which were integrated in the enzymatically active globule of CP.
T G Samsonidze; K A Moshkov; N A Kiselev; S A Neifakh
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of peptide and protein research     Volume:  14     ISSN:  0367-8377     ISO Abbreviation:  Int. J. Pept. Protein Res.     Publication Date:  1979 Aug 
Date Detail:
Created Date:  1979-12-20     Completed Date:  1979-12-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0330420     Medline TA:  Int J Pept Protein Res     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  161-8     Citation Subset:  IM    
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MeSH Terms
Ceruloplasmin* / analysis
Chemical Phenomena
Electrophoresis, Polyacrylamide Gel
Hydrogen Bonding
Microscopy, Electron
Models, Chemical
Molecular Weight
Peptide Fragments / analysis
Sodium Dodecyl Sulfate
Reg. No./Substance:
0/Peptide Fragments; 151-21-3/Sodium Dodecyl Sulfate; EC

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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