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The malate synthase gene of cucumber
I A Graham1, L M Smith, J W Brown
1Department of Botany, University of Edinburgh, Scotland, UK.
Plant Molecular Biology
|December 1, 1989
Summary
Researchers sequenced cucumber malate synthase (MS) genes, revealing regulatory regions and protein similarities. This work aids understanding of glyoxysomal enzyme targeting in plants.
Area of Science:
- Plant molecular biology
- Enzymology
- Biochemistry
Background:
- Malate synthase (MS) is a key glyoxysomal enzyme in plants.
- Understanding plant enzyme gene structure and function is crucial for metabolic studies.
Purpose of the Study:
- To determine the complete sequences of Cucumis sativus malate synthase (MS) cDNA and genomic clones.
- To identify gene regulatory elements and analyze protein sequence homology.
Main Methods:
- cDNA and genomic cloning techniques were employed.
- Sequence analysis was performed to identify control regions, introns, and polyadenylation sites.
- Deduced amino acid sequences were compared with homologous proteins.
Main Results:
- Complete sequences for cucumber MS cDNA and genomic clones were obtained.
- Putative 5' control regions, three introns, and alternative 3' polyadenylation sites were identified.
- The deduced MS polypeptide (64,961 MW) showed 48% identity to Escherichia coli MS.
- A conserved C-terminal tripeptide was identified, common to microbody-imported enzymes.
Conclusions:
- The determined sequences provide insights into the structure and regulation of cucumber malate synthase.
- Sequence homology suggests conserved functional domains and import mechanisms for glyoxysomal/peroxisomal enzymes.
- The conserved C-terminal tripeptide is likely a signal for microbody protein import.