TFIIIC1 is a multisubunit DNA binding factor that serves as a dynamic platform for assembly of pre-initiation complexes on class III genes. This entry represents the tau 95 subunit which holds a key position in TFIIIC, exerting both upstream and down ...
TFIIIC1 is a multisubunit DNA binding factor that serves as a dynamic platform for assembly of pre-initiation complexes on class III genes. This entry represents the tau 95 subunit which holds a key position in TFIIIC, exerting both upstream and downstream influence on the TFIIIC-DNA complex by rendering the complex more stable. Once bound to tDNA-intragenic promoter elements, TFIIIC directs the assembly of TFIIIB on the DNA, which in turn recruits the RNA polymerase III (pol III) and activates multiple rounds of transcription.
The histidine phosphatase superfamily is so named because catalysis centres on a conserved His residue that is transiently phosphorylated during the catalytic cycle. Other conserved residues contribute to a 'phosphate pocket' and interact with the p ...
The histidine phosphatase superfamily is so named because catalysis centres on a conserved His residue that is transiently phosphorylated during the catalytic cycle. Other conserved residues contribute to a 'phosphate pocket' and interact with the phospho group of substrate before, during and after its transfer to the His residue. Structure and sequence analyses show that different families contribute different additional residues to the 'phosphate pocket' and, more surprisingly, differ in the position, in sequence and in three dimensions, of a catalytically essential acidic residue. The superfamily may be divided into two main branches. The larger branch 1 contains a wide variety of catalytic functions, the best known being fructose 2,6-bisphosphatase (found in a bifunctional protein with 2-phosphofructokinase) and cofactor-dependent phosphoglycerate mutase. The latter is an unusual example of a mutase activity in the superfamily: the vast majority of members appear to be phosphatases. The bacterial regulatory protein phosphatase SixA is also in branch 1 and has a minimal, and possible ancestral-like structure, lacking the large domain insertions that contribute to binding of small molecules in branch 1 members.
