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FEBS Lett. 1987 May 25;216(1):17-21.

Histidine-rich glycoprotein is evolutionarily related to the cystatin superfamily. Presence of two cystatin domains in the N-terminal region.


A new member of the cystatin superfamily is introduced. Human plasma histidine-rich glycoprotein (HRG) was found to contain 2 cystatin-like sequences in tandem in the N-terminal region. Domain 1 (residues 1-112) was most homologous to domain 1 of the heavy chain of human kininogen and domain 2 (residues 113-225) was most homologous to human cystatin S as well as other cystatins and domain 3 of the heavy chain of kininogen, suggesting that the cystatin domains of HRG may represent a hitherto unknown binary form (or intermediate molecule) composed of 2 cystatin domains, and evolutionarily intermediate between the cystatin and the kininogen families.

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