Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Effect of mutation of lysine-128 of the large subunit of ribulose bisphosphate carboxylase/oxygenase from Anacystis nidulans
AU - Bainbridge, G.
AU - Anralojc, P. J.
AU - Madgwick, P. J.
AU - Pitts, J. E.
AU - Parry, M. A J
PY - 1998/12/1
Y1 - 1998/12/1
N2 - The contribution of lysine-128 within the active site of Anacystis nidulans D-ribulose 1,5-bisphosphate carboxylase/oxygenase was investigated by the characterization of mutants in which lysine-128 was replaced with arginine, glycine, glutamine, histidine or aspartic acid. Mutated genes encoding the Rubisco large subunit were expressed in Escherichia coli and the resultant polypeptides assembled into active complexes. All of the mutant enzymes had a lower affinity for ribulose 1,5-bisphosphate (RuBP) and lower rates of carboxylation. Substitution of lysine-128 with glutamine, histidine or aspartic acid decreased the specificity factor and led to the production of an additional monophosphate reaction product. We show that this product results from the loss of the phosphate from C-1 of RuBP, most probably by β-elimination from the 2,3-enediolate derivative of RuBP. The results confirm that lysine-128 is important in determining the position of the essential ε-amino group of lysine-334 within the active site and in loop dynamics. This further demonstrates that residues remote from the active site can be manipulated to modify catalytic function.
AB - The contribution of lysine-128 within the active site of Anacystis nidulans D-ribulose 1,5-bisphosphate carboxylase/oxygenase was investigated by the characterization of mutants in which lysine-128 was replaced with arginine, glycine, glutamine, histidine or aspartic acid. Mutated genes encoding the Rubisco large subunit were expressed in Escherichia coli and the resultant polypeptides assembled into active complexes. All of the mutant enzymes had a lower affinity for ribulose 1,5-bisphosphate (RuBP) and lower rates of carboxylation. Substitution of lysine-128 with glutamine, histidine or aspartic acid decreased the specificity factor and led to the production of an additional monophosphate reaction product. We show that this product results from the loss of the phosphate from C-1 of RuBP, most probably by β-elimination from the 2,3-enediolate derivative of RuBP. The results confirm that lysine-128 is important in determining the position of the essential ε-amino group of lysine-334 within the active site and in loop dynamics. This further demonstrates that residues remote from the active site can be manipulated to modify catalytic function.
UR - http://www.scopus.com/inward/record.url?scp=0032374056&partnerID=8YFLogxK
U2 - 10.1042/bj3360387
DO - 10.1042/bj3360387
M3 - Journal article
C2 - 9820816
AN - SCOPUS:0032374056
VL - 336
SP - 387
EP - 393
JO - Biochemical Journal
JF - Biochemical Journal
SN - 0264-6021
IS - 2
ER -