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B6db references: 8973563

type Journal Article
authors Palmieri, G.; Di Palo, M.; Scaloni, A.; Orru, S.; Marino, G.; Sannia, G.
title Glutamate-1-semialdehyde aminotransferase from Sulfolobus solfataricus
journal Biochem J
sel selected
ui 8973563
year (1996)
volume 320
number Pt 2
pages 541-5
keywords Amino Acid Sequence
abstract Glutamate-1-semialdehyde aminotransferase (GSA-AT) from the extremely thermophilic bacterium Sulfolobus solfataricus has been purified to homogeneity and characterized. GSA-AT is the last enzyme in the C5 pathway for the conversion of glutamate into the tetrapyrrole precursor delta-aminolaevulinate (ALA) in plants, algae and several bacteria. The active form of GSA-AT from S. solfataricus seems to be a homodimer with a molecular mass of 87 kDa. The absorption spectrum of the purified aminotransferase is indicative of the presence of pyridoxamine 5'-phosphate (PMP) cofactor, and the catalytic activity of the enzyme is further stimulated by addition of PMP. 3-Amino-2,3-dihydrobenzoic acid is an inhibitor of the aminotransferase activity. The N-terminal amino acid sequence of GSA-AT from S. solfataricus was found to share significant similarity with the eukaryotic and eubacterial enzymes. Evidence is provided that ALA synthesis in S. solfataricus follows the C5 pathway characteristic of plants, algae, cyanobacteria and many other bacteria.
last changed 2009/01/08 15:43

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