Abstract
The vitamin K-dependent proteins involved in blood coagulation processes each contain a small cystine loop with the sequence -Gla-Cys-X-Gla-Gla-X-Cys-. A method for the synthesis of the heptapeptide derivative representing the 17-23 sequence of bovine prothrombin, Z-Gla-Cys-Leu-Gla-Gla-Pro-Cys-OBzl, has been developed. The 25Mg2+ n.m.r. spectrum of the heptapeptide derivative has been obtained and is compared to the n.m.r. spectra obtained from the interaction of 25Mg2+ with Z-Gla-OMe and Z-Gla-Gla-OMe.
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