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. 1986 May;83(9):2974–2978. doi: 10.1073/pnas.83.9.2974

Amyloid fibrils in hereditary cerebral hemorrhage with amyloidosis of Icelandic type is a variant of gamma-trace basic protein (cystatin C).

J Ghiso, O Jensson, B Frangione
PMCID: PMC323429  PMID: 3517880

Abstract

A gamma-trace variant protein is the major constituent of the amyloid fibrils in patients from Iceland with hereditary cerebral hemorrhage with amyloidosis. The protein consists of 110 residues and is similar to human urinary gamma-trace basic protein (or cystatin C) beginning at its 11th amino-terminal residue. It has an amino acid substitution (glutamine for leucine) at position 58 (position 68 in gamma-trace numbering), which is near the proposed active site of related proteins--namely, cysteine protease inhibitors and kininogens. It is postulated that a point mutation has occurred, leading to the production of an unusual protein that is abnormally degraded, bound, and/or precipitated. Alternatively, gamma-trace basic protein may be genetically polymorphic, and the variant described here may represent an as-yet-undiscovered isotype or an allelic form that is linked to, but not responsible for, the deposition disease. Our data on the structure of a gamma-trace variant protein suggests that its gene expresses a polyprotein precursor in which active peptides are flanked by basic amino acid residues that permit cleavage to liberate small internal peptides. It is likely that the nucleotide sequence coding for Arg-Xaa and Lys-Xaa repeated several times in the molecule may function as alternative splicing sites for mRNA processing.

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Selected References

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