Acrosina

Acrosina
Identificadores
Símbolo	ACR
IDs externos	OMIM: 102480 MGI: 87884 HomoloGene: 855 ChEMBL: 2738 GeneCards: ACR Gene
Número EC	3.4.21.10
Ontologia do gene
Função molecular	•DNA binding; •amidase activity; •serine-type endopeptidase activity; •copper ion binding; •protein binding; •mannose binding; •drug binding; •zinc ion binding; •fucose binding;
Componente celular	•Golgi-associated vesicle; •acrosomal matrix; •protein complex;
Processo biológico	•acrosome matrix dispersal; •activation of adenylate cyclase activity; •single fertilization; •binding of sperm to zona pellucida; •acrosome reaction; •penetration of zona pellucida; •response to biotic stimulus; •response to steroid hormone stimulus;
	Sources: Amigo / QuickGO
Ortólogos
	v; d; e;

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Acrosina é uma enzima que actua como uma protease. Em seres humanos, a acrosina é codificada pelo gene ACR.^[1]^[2] A acrosina é libertada pelo acrossoma dos espermatozoides como consequência da reacção acrossómica. Auxilia na penetração da zona pelúcida.

Função[editar | editar código-fonte]

A acrosina é a principal proteinase presente no acrossoma de espermatozóides maduros. É uma típica serina protease com especificidade semelhante a tripsina. É acumulada no acromossoma na sua forma percursora, a pró-acrosina. A enzima activa funciona na lise da zona pelúcida, facilitando dessa forma a penetração do espermatozóide através das camadas glicoproteicas mais interiores do óvulo. O mRNA para a acrosina é sintetizado nos estágios pós-meióticos da espermatogénese. Na pró-acrosina humana aparece em primeiro lugar nos esparmatídeos haplóides.^[3]

Referências

↑ Adham IM, Klemm U, Maier WM, Engel W (janeiro de 1990). «Molecular cloning of human preproacrosin cDNA». Hum. Genet. 84 (2): 125–8. PMID 2298447. doi:10.1007/bf00208925
↑ Honda A, Siruntawineti J, Baba T (2002). «Role of acrosomal matrix proteases in sperm-zona pellucida interactions». Hum. Reprod. Update. 8 (5): 405–12. PMID 12398221. doi:10.1093/humupd/8.5.405
↑ «Entrez Gene: acrosin»

Leitura adicional[editar | editar código-fonte]

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MarÃ SI, Rawe V, Biancotti JC,; et al. (2003). «Biochemical and molecular studies of the proacrosin/acrosin system in patients with unexplained infertility». Fertil. Steril. 79 Suppl 3: 1676–9. PMID 12801583
Glogowski J, Demianowicz W, Piros B, Ciereszko A (1998). «Determination of acrosin activity of boar spermatozoa by the clinical method: optimization of the assay and changes during short-term storage of semen». Theriogenology. 50 (6): 861–72. PMID 10734459. doi:10.1016/S0093-691X(98)00191-5
Furlong LI, Veaute C, Vazquez-Levin MH (2005). «Binding of recombinant human proacrosin/acrosin to zona pellucida glycoproteins. II. Participation of mannose residues in the interaction». Fertil. Steril. 83 (6): 1791–6. PMID 15950652. doi:10.1016/j.fertnstert.2004.12.043
Furlong LI, Harris JD, Vazquez-Levin MH (2005). «Binding of recombinant human proacrosin/acrosin to zona pellucida (ZP) glycoproteins. I. Studies with recombinant human ZPA, ZPB, and ZPC». Fertil. Steril. 83 (6): 1780–90. PMID 15950651. doi:10.1016/j.fertnstert.2004.12.042
Hartley JL, Temple GF, Brasch MA (2000). «DNA Cloning Using In Vitro Site-Specific Recombination». Genome Res. 10 (11): 1788–95. PMC 310948. PMID 11076863. doi:10.1101/gr.143000
Collins JE, Wright CL, Edwards CA,; et al. (2004). «A genome annotation-driven approach to cloning the human ORFeome». Genome Biol. 5 (10): R84. PMC 545604. PMID 15461802. doi:10.1186/gb-2004-5-10-r84
Dubé C, Leclerc P, Baba T,; et al. (2005). «The proacrosin binding protein, sp32, is tyrosine phosphorylated during capacitation of pig sperm». J. Androl. 26 (4): 519–28. PMID 15955892. doi:10.2164/jandrol.04163
Strausberg RL, Feingold EA, Grouse LH,; et al. (2002). «Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences». Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. PMC 139241. PMID 12477932. doi:10.1073/pnas.242603899
Zahn A, Furlong LI, Biancotti JC,; et al. (2002). «Evaluation of the proacrosin/acrosin system and its mechanism of activation in human sperm extracts». J. Reprod. Immunol. 54 (1–2): 43–63. PMID 11839395. doi:10.1016/S0165-0378(01)00080-8
Howes E, Pascall JC, Engel W, Jones R (2001). «Interactions between mouse ZP2 glycoprotein and proacrosin; a mechanism for secondary binding of sperm to the zona pellucida during fertilization». J. Cell. Sci. 114 (Pt 22): 4127–36. PMID 11739644
Yudin AI, Vandevoort CA, Li MW, Overstreet JW (1999). «PH-20 but not acrosin is involved in sperm penetration of the macaque zona pellucida». Mol. Reprod. Dev. 53 (3): 350–62. PMID 10369396. doi:10.1002/(SICI)1098-2795(199907)53:3<350::AID-MRD11>3.0.CO;2-9