HTATIP (HIV-1 Tat interacting protein, 60kDa)
نویسنده
چکیده
The Tip60 protein (isoform 2) is 513 amino acids long and its molecular weight is about 60 kDa. It was cloned and characterized in 1996 thanks to its interaction with the HIV-1 transactivator Tat protein. Isoform 1 produces a 546 amino acids long protein. Isoform 3 produces a 461 amino acids long protein. A novel isoform, Tip55, encodes a novel splicing variant corresponding to 103 amino acids of the Cterminus. The domain architectures of human TIP60 is similar to yeast Esa1 protein and consist of a chromodomain and a MYST domain harboring a zinc finger and an AcetylCoA binding site.
منابع مشابه
Development of Inhibitors and Assay Methods for Histone Acetyltransferases
Histone acetyltransferases (HATs) are important enzymes in transcriptional control and potential targets for chemotherapeutic intervention in malignant diseases. Among different HAT members, the yeast Esa1 and human Tip60 (the HIV-1 Tat interactive protein, 60KDa) play multiple roles in normal cellular processes including transcription, cell cycle and checkpoint machinery, double strand DNA bre...
متن کاملHIV-1 Tat targets Tip60 to impair the apoptotic cell response to genotoxic stresses.
HIV-1 transactivator Tat uses cellular acetylation signalling by targeting several cellular histone acetyltransferases (HAT) to optimize its various functions. Although Tip60 was the first HAT identified to interact with Tat, the biological significance of this interaction has remained obscure. We had previously shown that Tat represses Tip60 HAT activity. Here, a new mechanism of Tip60 neutral...
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The translocation E26 transforming-specific (ETS) leukaemia (TEL), alias the ETS variant (ETV6), gene is expressed in most human tissues and encodes a transcriptional repressor. The TEL gene is involved in more than 40 different chromosomal translocations associated with haematological malignancies. As little is known about the function of intact TEL, we searched for TEL-interacting proteins by...
متن کاملTAR RNA decoys inhibit tat-activated HIV-1 transcription after preinitiation complex formation.
The ability of the HIV-1 Tat protein to trans -activate HIV-1 transcription in vitro is specifically inhibited by a circular TAR RNA decoy. This inhibition is not overcome by adding an excess of Tat to the reaction but is partially overcome by adding Tat in combination with nuclear extract, suggesting that TAR RNA might function by interacting with a complex containing Tat and cellular factor(s...
متن کاملSite Directed Mutagenesis, Expression and Enzymatic Studies of the 60 kDa Human HIV-TAT 1 Interactive Protein, TIP60
Tip60 is a 60 kDa nuclear protein which exists in three isoforms, belongs to the MYST/HAT family of proteins and was discovered after its interaction with the Human HIV-1 Tat. As a nuclear protein, Tip60 can act as a coactivator or repressor. To understand the HAT action of Tip60, two possible catalytic models exist; the ping-pong and the ternary complex formation models. In correlation with th...
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