Glabe C G, Vacquier V D
Proc Natl Acad Sci U S A. 1978 Feb;75(2):881-5. doi: 10.1073/pnas.75.2.881.
Bindin is an insoluble protein coating the sperm acrosome process and mediating the adhesion of sperm to sea urchin eggs. Milligrams of bindin have been isolated. Here we report the identification, isolation, and partial characterization of a high molecular weight, trypsin-sensitive glycoprotein fraction from the sea urchin egg surface having species-specific affinity for bindin. This glycoprotein may be the egg surface receptor for bindin. The bindin receptor was released from 125-I-labeled eggs by parthenogenetic activation of eggs with ionophore A23187 in the presence of soybean trypsin inhibitor. The receptor has an isoelectric point of 4.02 and a molecular weight in sea water greater than or equal to 5 X 10(6), suggesting that it is an aggregate. It contains 34% neutral sugars, which are galactose and mannose.
结合蛋白是一种不溶性蛋白质,覆盖在精子顶体突起上,介导精子与海胆卵的黏附。已经分离出了毫克级的结合蛋白。在此,我们报告了从海胆卵表面鉴定、分离和部分表征一种高分子量、对胰蛋白酶敏感的糖蛋白组分,该组分对结合蛋白具有物种特异性亲和力。这种糖蛋白可能是结合蛋白的卵表面受体。在大豆胰蛋白酶抑制剂存在的情况下,用离子载体A23187对卵进行孤雌激活,可从125-I标记的卵中释放出结合蛋白受体。该受体的等电点为4.02,在海水中的分子量大于或等于5×10(6),表明它是一种聚集体。它含有34%的中性糖,即半乳糖和甘露糖。