Characterisation of PigC and HapC, the prodigiosin synthetases from Serratia sp. and Hahella chejuensis with potential for biocatalytic production of anticancer agentsElectronic supplementary information (ESI) available: Full experimental details, protein gels, MichaelisMenten plots for PigC and HapC with all the MBC analogues, details of the kinetic models used to explain the substrate inhibition by MAP. Sequence alignment of PigC and HapC with PEPS and PPDK and homology model for PigC superimp

PigC and HapC catalyse the condensation of 4-methoxy-2,2-bipyrrole-5-carbaldehyde (MBC) with 2-methyl-3-amylpyrrole (MAP) to give the bright red tripyrrolic prodigiosin, which has potent anticancer activity. We have cloned and over-expressed both enzymes and characterised their enzymic activity in v...

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Hauptverfasser: Chawrai, Suresh R, Williamson, Neil R, Mahendiran, Thabo, Salmond, George P. C, Leeper, Finian J
Format: Artikel
Sprache:eng
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Zusammenfassung:PigC and HapC catalyse the condensation of 4-methoxy-2,2-bipyrrole-5-carbaldehyde (MBC) with 2-methyl-3-amylpyrrole (MAP) to give the bright red tripyrrolic prodigiosin, which has potent anticancer activity. We have cloned and over-expressed both enzymes and characterised their enzymic activity in vitro using both the natural substrates, MBC and MAP, and analogues of these substrates. Thus a range of prodigiosin analogues have been produced. Both PigC and HapC are membrane-associated enzymes and attempts to fully solubilise them using detergents led to inactivation. The enzymes are ATP-dependent but, unlike the enzymes to which they show the greatest similarity, the by-product is ADP not AMP. Two different slowly interconverting rotamers of prodigiosin exist and the spectral changes with time are consistent with isomerisation of the E , Z (or ) rotamer to the Z , Z (or ) rotameric form. PigC and HapC are shown to be ATP-dependent prodigiosin synthetases, proposed to activate the aldehyde of MBC by phosphorylation.
ISSN:2041-6520
2041-6539
DOI:10.1039/c1sc00588j