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The importance of various parameters such as sugarcane juice concentration, pH of the medium, and effects of different solid supports for maximum secretion of pectin lyase from Penicillium citrinum MTCC 8897 has been studied. The enzyme was purified to homogeneity by Sephadex G-100 and DEAE-cellulose chromatography. The molecular mass determined by SDS-PAGE was 31 kDa. The K(m) and k(cat) values were found to be 1 mg/ml and 76 sec(-1), respectively. The optimum pH of the purified pectin lyase was 9.0, though it retains activity in the pH 9.0-12.0 range when exposed for 24 h. The optimum temperature was 50 degrees C, and the pectin lyase was found to be completely stable up to 40 degrees C when exposed for 1 h. The purified pectin lyase was found efficient in retting of Linum usitatissimum, Cannabis sativa, and Crotalaria juncea.

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Aims/hypothesis Hyperglycaemia, a key feature of diabetes, is associated with non-enzymatic glycation of plasma proteins. We have shown previously that the reactive α-oxoaldehyde, methylglyoxal, non-enzymatically glycates apolipoprotein (Apo)A-I, the main apolipoprotein of HDL, and prevents it from activating lecithin:cholesterol acyltransferase (LCAT), the enzyme that generates almost all of the cholesteryl esters in plasma. This study investigates whether the glycation inhibitors aminoguanidine and pyridoxamine, the insulin sensitiser metformin and the cross-link breaker alagebrium can inhibit and/or reverse the methylglyoxal-mediated glycation of ApoA-I and whether these changes can preserve or restore the ability of ApoA-I to activate LCAT.