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Functional consequences of cleavage, dissociation and exocytotic release of ZP3R, a C4BP-related protein, from the mouse sperm acrosomal matrix.

ABSTRACT: The acrosome is an exocytotic vesicle located on the apical tip of the sperm head. In addition to having different morphological regions, two biochemically distinct compartments can be defined within the acrosome: a particulate acrosomal matrix and a soluble partition. The domains within the acrosome participate in the release of acrosomal proteins from the sperm during exocytosis, depending on whether the proteins partition into either the soluble or matrix compartments of the acrosome. We have examined the mechanism of differential release by evaluating the solubilization of acrosomal matrix protein ZP3R (sp56) from mouse sperm during the course of spontaneous acrosomal exocytosis. Using indirect immunofluorescence and immunoblotting, we found that the ZP3R monomer is processed from 67,000 M(r) to 43,000 M(r) by proteases coincident with release from the acrosome. Sperm require a maturational step, termed capacitation, before they are competent for acrosomal exocytosis and the processing of ZP3R is dramatically reduced under non-capacitating conditions. The cleavage probably takes place in complement control protein domain (CCP) 6 or the bridge region between CCP6 and CCP7, which is not present in the guinea pig orthologue AM67. The cleaved form of ZP3R does not bind to unfertilized eggs. We have incorporated these structural considerations into a model to explain the functional consequences of acrosomal exocytosis on sperm-zona interactions.

SUBMITTER: Buffone MG

PROVIDER: S-EPMC2729263 | biostudies-literature | 2009 Sep

REPOSITORIES: biostudies-literature

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Functional consequences of cleavage, dissociation and exocytotic release of ZP3R, a C4BP-related protein, from the mouse sperm acrosomal matrix.

Buffone Mariano G MG Kim Kye-Seong KS Doak Birgit J BJ Rodriguez-Miranda Esmeralda E Gerton George L GL

Journal of cell science 20090804 Pt 17

The acrosome is an exocytotic vesicle located on the apical tip of the sperm head. In addition to having different morphological regions, two biochemically distinct compartments can be defined within the acrosome: a particulate acrosomal matrix and a soluble partition. The domains within the acrosome participate in the release of acrosomal proteins from the sperm during exocytosis, depending on whether the proteins partition into either the soluble or matrix compartments of the acrosome. We have ...[more]

PMID: 19654207

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Project description:Some molecular and cellular mechanisms of fertilization are still not completely described. The role of the acrosomal matrix (AM), the particulate compartment within the acrosome, is one of them. Here, we proposed that amyloids, highly ordered protein aggregates, by their physical and chemical properties could contribute to AM roles in fertilization. Purified AM were exposed to a two-step extraction to sequentially strip off soluble proteins. The remaining insoluble material (core) was subjected to a mass spectrometry analysis. Preparation of samples for MS analysis: Three different approaches were used to optimize identification of peptides in the AM core. For in-gel digestion, core samples were resuspended in 13.2mM SA pH3 containing 8M urea and 100 mM DTT and incubated for 1 hr at RT. Proteins were separated on a hand casted 12% polyacrylamide Tris-glycine gel. After silver staining, visible bands were cut from the gel, destained and washed with ddH2O (2 X 5 min) then with 50% ethanol (2 X 5 min) before stored at -20 degrees C. Gel pieces were tryptically digested in 25mM triethylammonium bicarbonate buffer at 37 degrees C overnight with trypsin. For in-solution digestion, core samples were resuspended in 13.2mM SA pH3/ 8M urea/ 100mM DTT and incubated for 1 h at RT followed by 15 min at 70 degrees C. Iodoacetamide was added to 10mM and proteins were alkylated by incubation for 15 min at RT in the dark. Samples were added to a pre-rinsed spin filter and centrifuged at 14,000 X g. Samples were washed with 9M urea then with 25mM ammonium bicarbonate. Samples were digested with trypsin in 25mM ammonium bicarbonate overnight. After digestion, samples were spin at 14,000 X g and washed 2 times with 25mM ammonium bicarbonate. The retentate was transferred to a new tube and air dried. For on-membrane digestion, the samples were dotted on nitrocellulose membrane and digested by trypsin. Briefly, core samples were resuspended and treated as for in-solution digestion. Then, samples were dotted by gravity on the membrane. Wells were rinsed with 20mM SA pH3 followed by TBS. Dots were cut and air-dried. After the protein digestion with trypsin in 25mM ammonium bicarbonate the membranes were dissolved with acetone and the precipitated peptides were air-dried. All digested peptides were reconstituted in 2% acetonitrile/ 0.1% formic acid for MS analysis. MS data acquisition: Protein identification by liquid chromatography tandem mass spectrometry (LCMS/MS) analysis of peptides was performed using an LTQ Orbitrap Velos MS interfaced with a 2D nanoLC system. Protein and Peptide Identification: MS/MS spectra were extracted using the ProteoWizard Toolkit. The spectra were analyzed using the GPM Manager with X!Tandem to search against a home made mouse database containing 213,054 nonredundant protein sequences created by using mouse sequences from Ensembl database (files Mus_musculus.GRCm38.73.pep.all & Mus_musculus.GRCm38.73.pep.abinitio) and from NCBI database (file nr downloaded on 09/19/2013) . Search was performed using fully tryptic enzyme specificity (See deposited MS data for details). Peptides and proteins that have an expectation value of log10 (e) <= -2 were included in the results. Curated results were obtained by keeping only proteins with at least one mouse-specific matching peptide (peptide match = 100% identities and 100% coverage on a unique mouse protein and <100% identities and/or <100% coverage on human proteins). In addition, trypsin-like proteins were kept if at least one peptide was not matching on exogenous pig trypsins.

Dataset Information

Functional consequences of cleavage, dissociation and exocytotic release of ZP3R, a C4BP-related protein, from the mouse sperm acrosomal matrix.

Publications

Functional consequences of cleavage, dissociation and exocytotic release of ZP3R, a C4BP-related protein, from the mouse sperm acrosomal matrix.

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