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Functional Characterization of ABC10α, an Essential Polypeptide Shared by All Three Forms of Eukaryotic DNA-dependent RNA Polymerases
Journal of Biological Chemistry
ABC10␣ is a small polypeptide shared by the three yeast RNA polymerases. Homologous polypeptides in higher eukaryotes have a zinc-binding CX 2 C . . . CX 2 C motif and a conserved basic C-terminal end. These features are also found in archaeal gene products that may encode an RNA polymerase subunit. The CX 2 C . . . CX 2 C motif is partly dispensable, since only its first cysteine is essential for growth, whereas the basic C-terminal end is critical in vivo. A mutant in the latter domain has andoi:10.1074/jbc.274.44.31485 pmid:10531351 fatcat:nkeq6rtx2fe3bngo6gh2re4mn4