TY - JOUR
T1 - Residues in the acetyl CoA binding site of pyruvate carboxylase involved in allosteric regulation
AU - Choosangtong, K.
AU - Sirithanakorn, C.
AU - Adina-Zada, Abdussalam
AU - Wallace, J.C.
AU - Jitrapakdee, S.
AU - Attwood, Paul
PY - 2015
Y1 - 2015
N2 - © 2015 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved. We have examined the roles of Asp1018, Glu1027, Arg469 and Asp471 in the allosteric domain of Rhizobium etli pyruvate carboxylase. Arg469 and Asp471 interact directly with the allosteric activator acetyl coenzyme A (acetyl CoA) and the R469S and R469K mutants showed increased enzymic activity in the presence and absence of acetyl CoA, whilst the D471A mutant exhibited no acetyl CoA-activation. E1027A, E1027R and D1018A mutants had increased activity in the absence of acetyl CoA, but not in its presence. These results suggest that most of these residues impose restrictions on the structure and/or dynamics of the enzyme to affect activity.
AB - © 2015 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved. We have examined the roles of Asp1018, Glu1027, Arg469 and Asp471 in the allosteric domain of Rhizobium etli pyruvate carboxylase. Arg469 and Asp471 interact directly with the allosteric activator acetyl coenzyme A (acetyl CoA) and the R469S and R469K mutants showed increased enzymic activity in the presence and absence of acetyl CoA, whilst the D471A mutant exhibited no acetyl CoA-activation. E1027A, E1027R and D1018A mutants had increased activity in the absence of acetyl CoA, but not in its presence. These results suggest that most of these residues impose restrictions on the structure and/or dynamics of the enzyme to affect activity.
U2 - 10.1016/j.febslet.2015.06.034
DO - 10.1016/j.febslet.2015.06.034
M3 - Article
C2 - 26149215
SN - 0014-5793
VL - 589
SP - 2073
EP - 2079
JO - FEBS Letters
JF - FEBS Letters
IS - 16
ER -