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B6db references: 90272675

type Journal Article
authors Grimm, B.
title Primary structure of a key enzyme in plant tetrapyrrole synthesis: glutamate 1-semialdehyde aminotransferase
journal Proc Natl Acad Sci U S A
sel selected
ui 90272675
year (1990)
volume 87
number 11
pages 4169-73.
keywords Amino Acid Sequence
abstract The formation of delta-aminolevulinate from glutamate 1-semialdehyde (GSA) is catalyzed by glutamate 1-semialdehyde aminotransferase (EC The active form of the barley enzyme appears to be a dimer of identical subunits with a molecular mass of 46 kDa. From the purified enzyme, amino acid sequences of the N-terminal ends of the mature protein as well as an internal peptide were determined. DNA primers deduced from these peptide sequences were used to amplify with the polymerase chain reaction a cDNA sequence encoding part of the enzyme. Screening a cDNA library with this DNA fragment identified a full- length clone encoding the 49,540-Da precursor of the GSA aminotransferase. The transit peptide for chloroplast import consists of 34 amino acids. GSA aminotransferase and a precursor form were expressed on a multicopy plasmid in Escherichia coli. Both recombinant gene products reacted with an antibody against the barley GSA aminotransferase. Active barley GSA aminotransferase expressed in E. coli was shown to be active in assays of bacterial cell extracts. As a gene symbol for barley GSA aminotransferase, Gsa is proposed.
last changed 2008/05/21 16:26

B6db references