Abstract
Streptomyces arenae produces the antibiotic pentalenolactone, a highly specific inhibitor of glyceraldehyde-3-phosphate dehydrogenase (GAPDH). During the phase of pentalenolactone production, S. arenae expresses a pentalenolactone-insensitive GAPDH isoform; otherwise, a pentalenolactone-sensitive form is expressed. The gene of the pentalenolactone-insensitive GAPDH was cloned and sequenced. Regulatory elements typical for genes encoding antibiotic resistance and production are localized upstream and downstream of the open reading frame. No expression of pentalenolactone-insensitive GAPDH was detected in Streptomyces lividans transformed with the gene. In Escherichia coli, the gene was expressed from an induced lac promoter. Amino-terminal sequencing of the heterologously expressed GAPDH proved its identity with pentalenolactone-insensitive GAPDH from S. arenae. Sequence comparisons with GAPDH from other organisms showed a close relationship to GAPDH of plant chloroplasts, of other gram-positive bacteria, and of thermophilic gram-negative bacteria. Pentalenolactone-insensitive GAPDH differs from all closely related GAPDHs only in a few residues, none of which are directly involved in catalysis or substrate binding. The total ami...Continue Reading
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