Abstract
Mipu1 is a novel rat gene recently identified in our lab. Mipu1 cDNA contains a 1,824 bp open reading frame (ORF) and encoded a 608 amino acid protein with an N-terminal Krüppel-associated box (KRAB) domain and classical zinc finger C(2)H(2) motifs in the C-terminus. Mipu1 protein is located in the nuclei. Fused to Gal-4 DNA-binding domain and cotransfected with pG5-luc, Mipu1 played a transcriptional suppressive effect. Deletion analysis with a series of truncated fusion proteins indicated that the KRAB motif was a basal repression domain. Overexpression of Mipu1 in H9c2 myogenic cells inhibited the transcriptional activities of SRE and AP-1. RNAi of Mipu1 in H9c2 myogenic cells activated the transcriptional activities of SRE and AP-1. These results suggested that Mipu1 protein might act as a transcriptional repressor in mitogen-activated protein kinase (MAPK) signaling pathway to mediate cellular functions.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Sequence
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Animals
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Cells, Cultured
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DNA, Complementary / metabolism
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DNA-Binding Proteins / metabolism
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MAP Kinase Signaling System*
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Mitogen-Activated Protein Kinases / genetics
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Mitogen-Activated Protein Kinases / metabolism*
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Molecular Sequence Data
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Nuclear Proteins / analysis
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Nuclear Proteins / genetics*
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Nuclear Proteins / metabolism*
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Rats
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Recombinant Fusion Proteins / analysis
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Recombinant Fusion Proteins / genetics
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Recombinant Fusion Proteins / metabolism
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Repressor Proteins / analysis
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Repressor Proteins / genetics*
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Repressor Proteins / metabolism*
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Transcription Factor AP-1 / metabolism*
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Transcription Factors / metabolism*
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Transcription, Genetic*
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Transfection
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Zinc Fingers
Substances
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DNA, Complementary
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DNA-Binding Proteins
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Mipu1 protein, rat
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Nuclear Proteins
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Recombinant Fusion Proteins
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Repressor Proteins
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Transcription Factor AP-1
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Transcription Factors
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Mitogen-Activated Protein Kinases