Calcium effects on prothrombin and its reaction with bifunctional alkylating reagents

Ruth E. Silversmith, G. Jason Wei, Gary L. Nelsestuen

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Monodisperse bovine prothrombin was prepared and its molecular states under several conditions examined. The protein showed no tendency to self-associate in the absence of calcium. Calcium (4 mM) caused small increases in the apparent molecular weight of the protein which may or may not represent protein dimerization with very low affinity. The allowed conclusion was that calcium-induced prothrombin dimerization is minimal up to protein concentrations of many mg/ml. Calcium-induced protein shape changes did not measurably alter the protein diffusion constant. A bifunctional alkylating reagent did produce extensive calcium-dependent prothrombin crosslinking. Prothrombin dimers formed by the crosslinking agent were not a measure of the state of native prothrombin.

Original languageEnglish (US)
Pages (from-to)213-218
Number of pages6
JournalBiochemical and Biophysical Research Communications
Issue number1
StatePublished - Feb 28 1983

Bibliographical note

Funding Information:
Acknowledg~nents The authors are indebted to Dr. Victor Bloomfield for the quasielastic light scattering apparatus used to measure diffusion constants and molecular weights. This apparatus is maintained by grant PCM 8118107 from the National Science Foundation. This work was supported by grant HL 15728 from the National Institutes of Health.


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