Catalyzes the oxidation of 1-deoxy-11-beta-hydroxypentalenic acid to 1-deoxy-11-oxopentalenic acid in the biosynthesis of pentalenolactone antibiotic. 1-deoxy-11beta-hydroxypentalenate + NAD(+) = 1-deoxy-11-oxopentalenate + H(+) + NADH Antibiotic biosynthesis; pentalenolactone biosynthesis. Belongs to the short-chain dehydrogenases/reductases (SDR) family.