A Pseudoisostructural Type II DAH7PS Enzyme from <i>Pseudomonas aeruginosa</i>: Alternative Evolutionary Strategies to Control Shikimate Pathway Flux
作者:Oliver W. Sterritt、Sarah A. Kessans、Geoffrey B. Jameson、Emily J. Parker
DOI:10.1021/acs.biochem.8b00082
日期:2018.5.8
classified as typeII, have been identified. Here, the structure of a typeII DAH7PS enzyme from P. aeruginosa (PAO1) has been determined at 1.54 Å resolution, in complex with its allosteric inhibitor tryptophan. Structural differences in the extra-barrel elements, when compared to other typeII DAH7PS enzymes, directly relate to the formation of a distinct quaternary conformation with consequences
Fluorinated substrates result in variable leakage of a reaction intermediate during catalysis by dehydroquinate synthase
作者:Leonardo Negron、Emily J Parker
DOI:10.1039/c0ob01141j
日期:——
Incubation of (3S)-3-fluoro-3-deoxy-D-arabino-heptulosonate 7-phosphate with dehydroquinate (DHQ) synthase from three phylogenetically distinct sources resulted in the production of (6S)-6-fluoroDHQ and its epimer 1-epi-(6S)-6-fluoroDHQ. The differences in the product ratios of the reactions catalysed by each enzyme imply that 1-epi-(6S)-6-fluoroDHQ formation occurs by an unusual partial leakage of