Abstract
Platelet membrane sulfhydryls essential for phospholipase A2 activity were alkylated by [3H]N-ethylmaleimide after the non-essential sulfhydryls were cross-linked by azodicarboxylic acid bis(di-methylamide) (DA) or alkylated by N-ethylmaleimide. A 24.5K da protein labeled under phospholipase inhibitory conditions was not labeled under non-inhibitory conditions. The polypeptide, which had neither endogenous nor DA induced disulfides, may be a platelet membrane phospholipase A2 or a lipase regulatory protein.
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