RGD Reference Report - Germ cell beta-chimaerin, a new GTPase-activating protein for p21rac, is specifically expressed during the acrosomal assembly stage in rat testis. - Rat Genome Database

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Germ cell beta-chimaerin, a new GTPase-activating protein for p21rac, is specifically expressed during the acrosomal assembly stage in rat testis.

Authors: Leung, T  How, BE  Manser, E  Lim, L 
Citation: Leung T, etal., J Biol Chem 1993 Feb 25;268(6):3813-6.
RGD ID: 724725
Pubmed: PMID:8440677   (View Abstract at PubMed)

Diverse GTPase-activating proteins (GAPs) for the p21rho subfamily were detected by a novel overlay assay (Manser, E., Leung, T., Monfries, C., Teo, M., Hall, C., and Lim, L. (1992) J. Biol. Chem. 267, 16025-16028), with some GAPs being tissue-specific. Using a PCR strategy exploiting conserved regions common to rho/rac-GAPs, we have isolated a rat testis cDNA encoding a 34-kDa rac-GAP termed beta-chimaerin, as it was highly related to n-chimaerin, containing both a GAP domain (77% identity) and the phorbol ester-binding region (93% identity). beta-Chimaerin mRNA is expressed exclusively in the testis at the onset of sexual maturation. In situ hybridization and cell fractionation analyses show beta-chimaerin mRNA expression to be stage-specific, paralleling acrosomal assembly at the late stage of spermatogenesis. A corresponding testis-specific 30-kDa rac-GAP was detected. The testis-specific and stage-dependent expression of this new member of the chimaerin family offer an alternative model system for investigating the functional role of this class of p21 GAPs, particularly in relation to cytoskeletal reorganization.



Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Chn2Ratacrosome assembly  IEP  RGD 

Molecular Function

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Chn2RatGTPase activator activity  IDA  RGD 
Chn2Ratphorbol ester receptor activity  TAS  RGD 

Objects Annotated

Genes (Rattus norvegicus)
Chn2  (chimerin 2)


Additional Information