The two chromophores in E. coli photolyase (Mr 54,000), N5 N10-methenyltetrahydrofolylpolyglutamate (MTHF polyGlu) and FADH , perform complementary functions.

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#Unit 5. Developmental Biology

Fast block to polyspermy 

Within 1–3 seconds after the binding of the first sperm, the membrane potential shifts from -70mV to about +20 mV

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#Unit 5. Developmental Biology

Slow block to polyspermy (cortical granule reaction) becomes active about a minute after the first successful sperm-egg fusion

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#Unit 5. Developmental Biology

CGSP, an enzyme that cleaves the proteins linking the vitelline envelope to the cell membrane & also clips off the bindin receptors and any sperm attached to them.

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#Id: 961

#Unit 5. Developmental Biology

Cortical granule protein hyalin, forms a coating around the egg.

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#Id: 7571

#Unit 5. Developmental Biology

Mammalian fertilization occurs inside the oviducts  of the female

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#Unit 5. Developmental Biology

Translocation of sperm from the vagina to the oviduct involves several processes that work at different times and places:

Sperm motility

Uterine muscle contractions

Sperm rheotaxis