Homologies in the Structures of Bull Seminal Plasma Acrosin Inhibitors and Comparison with other Homologous Proteinase Inhibitors of the Kazal Type

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Abstract
After determination of the amino-acid sequence of a further acrosin inhibitor isolated from bull seminal plasma, the primary structures of the 3 seminal inhibitors known so far were compared with other homologous structures of protein-proteinase inhibitors. From the matrix of minimal base changes, a high divergence in the evolution of the seminal inhibitors can be seen. Inhibitors from bull seminal plasma show even a higher degree of relationship to dog submandibular gland inhibitor domain II and the 3rd domain of quail ovomucoid than to acrosin inhibitor from boar seminal plasma.

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