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 - 2-Carboxy-D-arabinitol 1-phosphate (CA1P) phosphatase
T2 - evidence for a wider role in plant Rubisco regulation
AU - Andralojc, Paul John
AU - Madgwick, Pippa J.
AU - Tao, Yong
AU - Keys, Alfred
AU - Ward, Jane L.
AU - Beale, Michael H.
AU - Loveland, Jane E.
AU - Jackson, Phil J.
AU - Willis, Antony C.
AU - Gutteridge, Steven
AU - Parry, Martin A. J.
PY - 2012/3/15
Y1 - 2012/3/15
N2 - The genes for CA1Pase (2-carboxy-D-arabinitol-1-bisphosphate phosphatase) from French bean, wheat, Arabidopsis and tobacco were identified and cloned. The deduced protein sequence included an N-terminal motif identical with the PGM (phosphoglycerate mutase) active site sequence [LIVM]-x-R-H-G-[EQ]-x-x-[WN]. The corresponding gene from wheat coded for an enzyme with the properties published for CA1Pase. The expressed protein lacked PGM activity but rapidly dephosphorylated 2,3-DPG (2,3-diphosphoglycerate) to 2-phosphoglycerate. DTT (dithiothreitol) activation and GSSG inactivation of this enzyme was pH-sensitive, the greatest difference being apparent at pH 8. The presence of the expressed protein during in vitro measurement of Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase) activity prevented a progressive decline in Rubisco turnover. This was due to the removal of an inhibitory bisphosphate that was present in the RuBP (ribulose-1,5-bisphosphate) preparation, and was found to be PDBP (D-glycero-2,3-pentodiulose-1,5- bisphosphate). The substrate specificity of the expressed protein indicates a role for CA1Pase in the removal of 'misfire' products of Rubisco.
AB - The genes for CA1Pase (2-carboxy-D-arabinitol-1-bisphosphate phosphatase) from French bean, wheat, Arabidopsis and tobacco were identified and cloned. The deduced protein sequence included an N-terminal motif identical with the PGM (phosphoglycerate mutase) active site sequence [LIVM]-x-R-H-G-[EQ]-x-x-[WN]. The corresponding gene from wheat coded for an enzyme with the properties published for CA1Pase. The expressed protein lacked PGM activity but rapidly dephosphorylated 2,3-DPG (2,3-diphosphoglycerate) to 2-phosphoglycerate. DTT (dithiothreitol) activation and GSSG inactivation of this enzyme was pH-sensitive, the greatest difference being apparent at pH 8. The presence of the expressed protein during in vitro measurement of Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase) activity prevented a progressive decline in Rubisco turnover. This was due to the removal of an inhibitory bisphosphate that was present in the RuBP (ribulose-1,5-bisphosphate) preparation, and was found to be PDBP (D-glycero-2,3-pentodiulose-1,5- bisphosphate). The substrate specificity of the expressed protein indicates a role for CA1Pase in the removal of 'misfire' products of Rubisco.
KW - 2-carboxyarabinitol 1-phosphate (CA1P)
KW - D-glycero-2,3-pentodiulose-1,5- bisphosphate (PDBP) phosphatase
KW - Ribulose- 1,5-bisphosphate carboxylase/oxygenase (Rubisco)
U2 - 10.1042/BJ20111443
DO - 10.1042/BJ20111443
M3 - Journal article
C2 - 22132794
AN - SCOPUS:84857864015
VL - 442
SP - 733
EP - 742
JO - Biochemical Journal
JF - Biochemical Journal
SN - 0264-6021
IS - 3
ER -