Artículo
Expression and structure-function analysis of de, a sperm cysteine rich secretory protein that mediates gamete fusion
Ellerman, Diego Andrés; Da Ros, Vanina Gabriela
; Cohen, Debora Juana
; Busso, Dolores; Morgenfeld, Mauro Miguel
; Cuasnicu, Patricia Sara
![Icon](/themes/CONICETDigital/images/conicet.png)
![Icon](/themes/CONICETDigital/images/conicet.png)
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Fecha de publicación:
04/2002
Editorial:
Society for the Study of Reproduction
Revista:
Biology of Reproduction
ISSN:
0006-3363
e-ISSN:
1529-7268
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Rat sperm epididymal glycoprotein DE belongs to the cysteine- rich secretory protein (CRISP) family and participates in sperm-egg fusion through its binding to complementary sites on the egg surface. To investigate the molecular mechanisms underlying the role of DE in gamete fusion, in the present work we expressed DE in a prokaryotic system, and examined the relevance of carbohydrates and disulfide bonds for the biological activity of the protein. Immunofluorescence and sperm-egg fusion assays carried out in the presence of recombinant DE (recDE) revealed that this protein exhibits the ability to bind to the DE-egg binding sites and to inhibit gamete fusion, as does native DE (nDE). Comparison of the proteins indicated, however, that the inhibitory ability of recDE was significantly lower than that of nDE. This difference would not be due to the lack of carbohydrates in the bacterially expressed protein because enzymatically deglycosylated nDE was as able as the untreated protein to inhibit gamete fusion. To examine whether disulfide bridges are involved in DE activity, the presence of sulfhydryls in nDE and recDE was evaluated by the biotin-maleimide technique. Results indicated that, unlike nDE, in which all cysteines are involved in disulfide bonds, recDE contains free thiol groups. Subsequent experiments showed that reduction of nDE with dithiothreitol significantly decreased the ability of the protein to inhibit gamete fusion. Together, these results indicate that whereas carbohydrates do not have a role in DE-mediated gamete fusion, disulfide bridges are required for full biological activity of the protein. To our knowledge, this is the first study reporting the relevance of structural components for the function of a CRISP member.
Palabras clave:
Epididymis
,
Fer4tilization
,
Fusion
,
Ovum
,
Sperm
,
Epididymis
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Identificadores
Colecciones
Articulos(IBYME)
Articulos de INST.DE BIOLOGIA Y MEDICINA EXPERIMENTAL (I)
Articulos de INST.DE BIOLOGIA Y MEDICINA EXPERIMENTAL (I)
Citación
Ellerman, Diego Andrés; Da Ros, Vanina Gabriela; Cohen, Debora Juana; Busso, Dolores; Morgenfeld, Mauro Miguel; et al.; Expression and structure-function analysis of de, a sperm cysteine rich secretory protein that mediates gamete fusion; Society for the Study of Reproduction; Biology of Reproduction; 67; 4; 4-2002; 1225-1231
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