N-acetylglucosaminidase inhibitor isolated from the vitelline coat of ascidian eggs is a candidate sperm receptor.

Abstract:

:An inhibitor against the egg beta-D-N-acetylglucosaminidase (GlcNAcase) was purified from the vitelline coat of eggs of the ascidian, Halocynthia roretzi. The purified inhibitor gave a single band with an apparent molecular mass of 70 kDa on SDS-PAGE under non-reducing conditions. The GlcNAcase inhibitor potently inhibited the ascidian egg GlcNAcase activity, and also substantially inhibited the GlcNAcase activity in the ascidian sperm extract, although to lesser extent. In contrast, it showed little inhibitory effect on the activity of GlcNAcase from Jack beans. This inhibitor was found to block the binding of sperm to the vitelline coat of the eggs in a concentration-dependent manner. These results strongly suggest that the GlcNAcase inhibitor isolated from the vitelline coat functions in the binding of sperm to the egg coat, as a possible sperm receptor.

authors

Matsuura K,Sawada H,Yokosawa H

doi

10.1006/bbrc.1995.2131

subject

Has Abstract

pub_date

1995-08-04 00:00:00

pages

311-6

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(85)72131-6

journal_volume

213

pub_type

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