cDNA cloning of two isoforms of ornithine carbamoyltransferase from Canavalia lineata leaves and the effect of site-directed mutagenesis of the carbamoyl phosphate binding site.

Abstract:

:The immunoscreening method was used to isolate cDNAs of 1323 bp (ClOCT1) and 1433 bp (ClOCT2) encoding two ornithine carbamoyltransferases (OCT, EC 2.1.3.3) from the cDNA expression library of Canavalia lineata leaves constructed in a lambdaZAP Express vector. ClOCT1 and ClOCT2 encode 359 and 369 amino acids, respectively. The N-terminals of deduced amino acid sequences of the two cDNAs showed typical features of the transit peptide of chloroplast targeting proteins. The ornithine-binding domain (FMHCLP) and catalytic domain (HPXQ) of ClOCT1 and ClOCT2 and the carbamoyl phosphate (CP)-binding site of ClOCT1 (SMRTR) are identical to OCTs of other plant species, pea and Arabidopsis thaliana. However, the CP-binding site sequence of ClOCT2, SLRTH, has not yet been reported. Both ClOCT1 and ClOCT2 cDNAs were expressed in Escherichia coli BL21 (DE3) by using expression vector pET30a. Recombinant ClOCT1 protein showed 14 times higher ornithine-dependent OCT activity than canaline-dependent OCT activity. In contrast, recombinant ClOCT2 protein showed 13 times higher canaline-dependent OCT activity than ornithine-dependent OCT activity. The two amino acids of the CP-binding site of ClOCT2 (SLRTH) were combinatorially changed to those of the CP-binding site of ClOCT1 (SMRTR) by site-directed mutagenesis. When Leu-118 of ClOCT2 was changed to Met, ornithine-dependent activity was increased significantly. It is assumed that the substrate specificity of ClOCT1 or ClOCT2 proteins partially depends on the amino acid sequence of the CP-binding site.

journal_name

Plant Mol Biol

journal_title

Plant molecular biology

authors

Lee Y,Choi YA,Hwang ID,Kim SG,Kwon YM

doi

10.1023/a:1011632927541

subject

Has Abstract

pub_date

2001-08-01 00:00:00

pages

651-60

issue

6

eissn

0167-4412

issn

1573-5028

journal_volume

46

pub_type

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