Inhibition of RhoA‐mediated SRF activation by p116Rip
pmid: 16243315
Inhibition of RhoA‐mediated SRF activation by p116Rip
p116Rip, originally identified as a binding partner of activated RhoA, is an actin‐binding protein that interacts with the regulatory myosin‐binding subunit (MBS) of myosin‐II phosphatase and is essential for Rho‐regulated cytoskeletal contractility. Here, we have examined the role of p116Rip in RhoA‐mediated activation of the transcription factor SRF. We show that p116Rip oligomerizes via its C‐terminal coiled‐coil domain and, when overexpressed, inhibits RhoA‐induced SRF activation without affecting RhoA‐GTP levels. Mutant forms of p116Rip that fail to oligomerize or bind to MBS are still capable of inhibiting SRF activity. Our results suggest that p116Rip interferes with RhoA‐mediated transcription through its ability to disassemble the actomyosin cytoskeleton downstream of RhoA.
- Netherlands Heart Institute Netherlands
- Antoni van Leeuwenhoek Hospital Netherlands
Serum Response Factor, Myosin Light Chains, Transcription, Genetic, Microfilament Proteins, Molecular Sequence Data, RhoA, Actin-binding protein, Protein Structure, Tertiary, Mice, Serum Response Element, Mutation, Animals, Humans, Coiled-coil, SRF, Amino Acid Sequence, rhoA GTP-Binding Protein, Cytoskeleton, Cells, Cultured
Serum Response Factor, Myosin Light Chains, Transcription, Genetic, Microfilament Proteins, Molecular Sequence Data, RhoA, Actin-binding protein, Protein Structure, Tertiary, Mice, Serum Response Element, Mutation, Animals, Humans, Coiled-coil, SRF, Amino Acid Sequence, rhoA GTP-Binding Protein, Cytoskeleton, Cells, Cultured
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