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. 1991 Mar 15;274(Pt 3):899–902. doi: 10.1042/bj2740899

Rat tyrosine kinase inhibitor shows sequence similarity to human alpha 2-HS glycoprotein and bovine fetuin.

M Haasemann 1, P Nawratil 1, W Müller-Esterl 1
PMCID: PMC1149996  PMID: 1707273

Abstract

Human alpha 2-HS glycoprotein and bovine fetuin, abundant proteins of fetal plasma, are structural members of the fetuin family within the cystatin superfamily. They are characterized by the presence of two N-terminally located cystatin-like units and a unique C-terminal sequence segment not present in the other members of the cystatin superfamily. Search for related sequences revealed that the natural inhibitor of the insulin receptor tyrosine kinase [Auberger, Falquerho, Contreres, Pages, Le Cam, Rossi & Le Cam (1989) Cell (Cambridge, Mass.) 58, 631-640] shows sequence similarity to the mammalian fetuins. The sequence identity between rat tyrosine kinase inhibitor, human alpha 2-HS glycoprotein and bovine fetuin is 56 and 60% respectively (percentage of residues in identical positions). The sequence similarity extends over the entire protein structures, except the extreme C-terminal portions. In particular, the number and relative positions of the cysteine residues are invariant among the proteins, suggesting that the characteristic array of linearly arranged and tandemly repeated disulphide loops of the cystatin superfamily is also present in rat tyrosine kinase inhibitor. We conclude that rat tyrosine kinase inhibitor may be classified as a novel member of the mammalian fetuin family.

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Selected References

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