domain:The coiled-coil domain mediates oligomerization.,function:Transcriptional regulator which functions as a general RNA polymerase II transcription inhibitor. In cooperation with 7SK snRNA sequesters P-TEFb in a large inactive 7SK snRNP complex preventing RNA polymerase II phosphorylation and subsequent transcriptional elongation.,induction:Up-regulated by HMBA (hexamethylene bisacetamide) (at protein level).,similarity:Belongs to the HEXIM family.,subunit:Homooligomer and heterooligomer with HEXIM1; probably dimeric. Component of the 7SK snRNP complex at least composed of P-TEFb (composed of CDK9 and CCNT1/cyclin-T1), HEXIM1, HEXIM2, BCDIN3, SART3 proteins and 7SK and U6 snRNAs.,tissue specificity:Ubiquitously expressed with higher expression in testis. HEXIM1 and HEXIM2 are differentially expressed.,
Nucleus .
Ubiquitously expressed with higher expression in testis. HEXIM1 and HEXIM2 are differentially expressed.
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