82277-62-1Relevant academic research and scientific papers
Overproduction of the acyl carrier protein component of a type II polyketide synthase stimulates production of tetracenomycin biosynthetic intermediates in Streptomyces glaucescens
Decker,Summers,Hutchinson
, p. 54 - 63 (1994)
The development of microorganisms with improved antibiotic production is an important goal in the commercialization of new pharmaceuticals or in lowering the cost of established drugs. We report a way to achieve this for biosynthetic intermediates of an antibiotic made by the polyketide pathway whose earliest steps involve a Type II multienzyme complex. Introduction of the tcmKLM β-ketoacyl: ACP synthase and acyl carrier protein (ACP) genes or just the tcmM ACP gene into the tetracenomycin (Tcm) C-producing Streptomyces glaucescens wild-type strain, or its tcmN or tcmO blocked mutants, on high copy vectors under the control of strong promoters caused a 2 to 30-fold overproduction of Tcm D3 and some other biosynthetic intermediates (or shunt products) and a 25 to 30% increase in Tcm C production relative to the control strains carrying the plasmid vector only. However, Tcm C production was not greater than that obtained with the vector-free wild-type strain. The unexpected effect of increased ACP on Tcm D3 production suggests that the level of this protein can influence either the activity or level of the three other components of the Tcm polyketide synthase.
Synthesis of tetracenomycins
Cameron,De Bruyn
, p. 5593 - 5596 (2007/10/02)
Tetracenomycins D, A2, B1 and B2 (2)-(5) have been synthesised for the first time, by an efficient, regioselective sequence based on cycloaddition methodology; the ambiguity that existed for tetracenomycins B1 and B2 has thereby been resolved in favour of structures (4a) and (5b) respectively.
