Actin-like filaments in the acrosomal apparatus of spermatozoa of a sea urchin |
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| Authors: | H Jessen O Behnke K G Wingstrand J Rostgaard |
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| Institution: | 1. Anatomy Department C, University of Copenhagen, 2200 DK Copenhagen N, Denmark;2. Institute of Comparative Anatomy, University of Copenhagen, 2200 DK Copenhagen N, Denmark |
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| Abstract: | The acrosomal apparatus of a sea urchin, Echinocardium cordatum, consists of an acrosomal vesicle and a post-acrosomal rod. The rod is 2.5 μm long and extends from the acrosomal vesicle to the bottom of a nuclear invagination. The rod consists of a bundle of longitudinally disposed, 60 Å thick, actin-like filaments which bind heavy meromyosin to form arrowhead complexes. The actin-like filaments may have a dual function in the fertilization process: (1) extension of the acrosomal process through the egg investments; (2) incorporation of the sperm nucleus. |
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