An egg envelope component induces the acrosome reaction in sturgeon sperm.
Identifieur interne : 000789 ( Ncbi/Merge ); précédent : 000788; suivant : 000790An egg envelope component induces the acrosome reaction in sturgeon sperm.
Auteurs : G N Cherr ; W H ClarkSource :
- The Journal of experimental zoology [ 0022-104X ] ; 1985.
English descriptors
- KwdEn :
- MESH :
- chemical , physiology : Carbohydrates, Egg Proteins, Glycoproteins.
- physiology : Acrosome, Fishes, Ovum, Spermatozoa.
- Animals, Female, Male, Molecular Weight, Solubility, Sperm-Ovum Interactions.
Abstract
The acrosome reaction in Acipenser transmontanus sperm can be induced by a 66,000 dalton glycoprotein that is present in Layer 3 (L3) of the egg envelope and in egg water only following exposure of the eggs to fresh water. When egg water is fractionated on Sepharose CL 6B, the 66,000 dalton glycoprotein-containing fractions possess acrosome reaction inducing activity. Egg water may be species-specific in its ability to elicit the acrosome reaction, as demonstrated by the fact that it has no effect on the sperm of Acipenser fulvescens. Egg jelly possesses no acrosome reaction, inducing activity. The major carbohydrate-containing component of the egg envelope is L3, a layer that contains galactose residues. L3 possesses a 70,000 dalton glycoprotein prior to freshwater exposure and lacks the 66,000 dalton component. If isolated from polyacrylamide gels, the 70,000 dalton glycoprotein elicits acrosome reactions in what appears to be a species specific manner. After freshwater exposure, L3 contains both the 70,000 dalton glycoprotein and the 66,000 dalton glycoprotein that is also present in egg water. The appearance of the 66,000 dalton inducer can be blocked by the incubation of eggs in fresh water containing inhibitors of trypsin activity. Thus, the soluble inducer in egg water may be proteolytically derived from a higher molecular weight complex in the egg envelope.
DOI: 10.1002/jez.1402340110
PubMed: 3989500
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When egg water is fractionated on Sepharose CL 6B, the 66,000 dalton glycoprotein-containing fractions possess acrosome reaction inducing activity. Egg water may be species-specific in its ability to elicit the acrosome reaction, as demonstrated by the fact that it has no effect on the sperm of Acipenser fulvescens. Egg jelly possesses no acrosome reaction, inducing activity. The major carbohydrate-containing component of the egg envelope is L3, a layer that contains galactose residues. L3 possesses a 70,000 dalton glycoprotein prior to freshwater exposure and lacks the 66,000 dalton component. If isolated from polyacrylamide gels, the 70,000 dalton glycoprotein elicits acrosome reactions in what appears to be a species specific manner. After freshwater exposure, L3 contains both the 70,000 dalton glycoprotein and the 66,000 dalton glycoprotein that is also present in egg water. The appearance of the 66,000 dalton inducer can be blocked by the incubation of eggs in fresh water containing inhibitors of trypsin activity. Thus, the soluble inducer in egg water may be proteolytically derived from a higher molecular weight complex in the egg envelope.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">3989500</PMID><DateCreated><Year>1985</Year><Month>06</Month><Day>03</Day></DateCreated><DateCompleted><Year>1985</Year><Month>06</Month><Day>03</Day></DateCompleted><DateRevised><Year>2006</Year><Month>11</Month><Day>15</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0022-104X</ISSN><JournalIssue CitedMedium="Print"><Volume>234</Volume><Issue>1</Issue><PubDate><Year>1985</Year><Month>Apr</Month></PubDate></JournalIssue><Title>The Journal of experimental zoology</Title><ISOAbbreviation>J. Exp. Zool.</ISOAbbreviation></Journal><ArticleTitle>An egg envelope component induces the acrosome reaction in sturgeon sperm.</ArticleTitle><Pagination><MedlinePgn>75-85</MedlinePgn></Pagination><Abstract><AbstractText>The acrosome reaction in Acipenser transmontanus sperm can be induced by a 66,000 dalton glycoprotein that is present in Layer 3 (L3) of the egg envelope and in egg water only following exposure of the eggs to fresh water. When egg water is fractionated on Sepharose CL 6B, the 66,000 dalton glycoprotein-containing fractions possess acrosome reaction inducing activity. Egg water may be species-specific in its ability to elicit the acrosome reaction, as demonstrated by the fact that it has no effect on the sperm of Acipenser fulvescens. Egg jelly possesses no acrosome reaction, inducing activity. The major carbohydrate-containing component of the egg envelope is L3, a layer that contains galactose residues. L3 possesses a 70,000 dalton glycoprotein prior to freshwater exposure and lacks the 66,000 dalton component. If isolated from polyacrylamide gels, the 70,000 dalton glycoprotein elicits acrosome reactions in what appears to be a species specific manner. After freshwater exposure, L3 contains both the 70,000 dalton glycoprotein and the 66,000 dalton glycoprotein that is also present in egg water. The appearance of the 66,000 dalton inducer can be blocked by the incubation of eggs in fresh water containing inhibitors of trypsin activity. 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