Histidine phosphocarrier protein, mol. model

Molecular model of histidine phosphocarrier protein HPR (pdb code: 1poh)(ribbon diagram, His-15 shown as ball-and-stick model, no labels). HPR is part of the phosphoenolpyruvate-dependent sugar phospho-transferase system (PTS), a major carbohydrate active transport system moving certain hexoses across the cytoplasmic membrane of bacteria and mycoplasmas. The His-15 at the active site of HPR accepts a multi-enzyme system (Enzyme I) and transfers it to various sugar- specific PTS permeases.