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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Functional roles of conserved amino acid residues surrounding the phosphorylatable histidine of the yeast phosphorelay protein YPD1.

The histidine-containing phosphotransfer (HPt) protein YPD1 is an osmoregulatory protein in yeast that facilitates phosphoryl transfer between the two response regulator domains associated with SLN1 and SSK1. Based on the crystal structure of YPD1 and the sequence alignment of YPD1 with other HPt domains, we site-specifically engineered and purified several YPD1 mutants in order to examine the role of conserved residues surrounding the phosphorylatable histidine (H64). Substitution of the positively charged residues K67 and R90 destabilized the phospho-imidazole linkage, whereas substitution of G68 apparently reduces accessibility of H64. These findings, together with the effect of other mutations, provide biochemical support of the proposed functional roles of conserved amino acid residues of HPt domains.[1]


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