cd04905

C-terminal ACT domain of the bifunctional chorismate mutase-prephenate dehydratase (CM-PDT) enzyme and the prephenate dehydratase (PDT) enzyme

CDD entry
Member databaseCDD
CDD typedomain
Short nameACT_CM-PDT
SetACT

Description

The C-terminal ACT domain of the bifunctional chorismate mutase-prephenate dehydratase (CM-PDT) enzyme and the prephenate dehydratase (PDT) enzyme, found in plants, fungi, bacteria, and archaea. The P-protein of E. coli (CM-PDT, PheA) catalyzes the conversion of chorismate to prephenate and then the decarboxylation and dehydration to form phenylpyruvate. These are the first two steps in the biosynthesis of L-Phe and L-Tyr via the shikimate pathway in microorganisms and plants. The E. coli P-protein (CM-PDT) has three domains with an N-terminal domain with chorismate mutase activity, a middle domain with prephenate dehydratase activity, and an ACT regulatory C-terminal domain. The prephenate dehydratase enzyme has a PDT and ACT domain. The ACT domain is essential to bring about the negative allosteric regulation by L-Phe binding. L-Phe binds with positive cooperativity; with this binding, there is a shift in the protein to less active tetrameric and higher oligomeric forms from a more active dimeric form. Members of this CD belong to the superfamily of ACT regulatory domains.
[2, 1]

References

1.pheA (Rv3838c) of Mycobacterium tuberculosis encodes an allosterically regulated monofunctional prephenate dehydratase that requires both catalytic and regulatory domains for optimum activity. Prakash P, Pathak N, Hasnain SE. J. Biol. Chem. 280, 20666-71, (2005). View articlePMID: 15753077

2.Allosteric mechanisms in ACT domain containing enzymes involved in amino acid metabolism. Liberles JS, Thorolfsson M, Martinez A. Amino Acids 28, 1-12, (2005). PMID: 15662561

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