Sasha Akoulitchev

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The mammalian cyclin-dependent kinase 8 (cdk8) gene has been linked with a subset of acute lymphoblastic leukaemias, and its corresponding protein has been functionally implicated in regulation of transcription. Mammalian cdk8 and cyclin C, and their respective yeast homologues, Srb10 and Srb11, are components of the RNA polymerase II holoenzyme complex(More)
An array of tandem heptapeptide repeats at the carboxy-terminal domain (CTD) of the largest subunit of RNA polymerase II constitute a highly conserved structure essential for viability. Studies have established that the CTD is phosphorylated at different stages of the transcription cycle, and that it may be involved in transcriptional regulation. The exact(More)
Transcription factor IIH (TFIIH) is a multisubunit complex required for transcription and for DNA nucleotide excision repair. TFIIH possesses three enzymatic activities: (i) an ATP-dependent DNA helicase, (ii) a DNA-dependent ATPase, and (iii) a kinase with specificity for the carboxyl-terminal domain of RNA polymerase II. The kinase activity was recently(More)
Inherited mutations of the TFIIH helicase subunits xeroderma pigmentosum (XP) B or XPD yield overlapping DNA repair and transcription syndromes. The high risk of cancer in these patients is not fully explained by the repair defect. The transcription defect is subtle and has proven more difficult to evaluate. Here, XPB and XPD mutations are shown to block(More)
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