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Purification and properties of two phospholipases D from Streptomyces sp. 1995

G Carrea, and P D'Arrigo, and V Piergianni, and S Roncaglio, and F Secundo, and S Servi
CNR, Istituto di Chimica degli Ormoni, Milano, Italy.

Two enzymes with phospholipase D activity were purified from Streptomyces strains (PMF and PM43) by column chromatography on Fractogel TSK CM-650(S), Sephadex G-100 and Fractogel EMD DEAE-650(M). The purified preparations were found to be homogeneous by SDS-PAGE, capillary electrophoresis and analytical gel filtration. The molecular masses, assessed by MALDI-MS spectrometry, were 53.864 kDa for PMF and 54.147 kDa for PM43. The isoelectric point was 9.1 for both enzymes. The enzymes were most active at around 60 degrees C and stable between pH 4 and 9 and below 50 degrees C. The pH optima were between 4 and 6 for PMF and between 6 and 7 for PM43. Both phospholipases displayed high transphosphatidylation activity but PMF was more selective than PM43.

UI MeSH Term Description Entries
D007526 Isoelectric Point The pH in solutions of proteins and related compounds at which the dipolar ions are at a maximum. Isoelectric Points,Point, Isoelectric,Points, Isoelectric
D007527 Isoenzymes Structurally related forms of an enzyme. Each isoenzyme has the same mechanism and classification, but differs in its chemical, physical, or immunological characteristics. Alloenzyme,Allozyme,Isoenzyme,Isozyme,Isozymes,Alloenzymes,Allozymes
D008970 Molecular Weight The sum of the weight of all the atoms in a molecule. Molecular Weights,Weight, Molecular,Weights, Molecular
D010739 Phospholipase D An enzyme found mostly in plant tissue. It hydrolyzes glycerophosphatidates with the formation of a phosphatidic acid and a nitrogenous base such as choline. This enzyme also catalyzes transphosphatidylation reactions. EC 3.1.4.4. Lecithinase D,Phosphatidylcholine Phosphohydrolase
D004795 Enzyme Stability The extent to which an enzyme retains its structural conformation or its activity when subjected to storage, isolation, and purification or various other physical or chemical manipulations, including proteolytic enzymes and heat. Enzyme Stabilities,Stabilities, Enzyme,Stability, Enzyme
D006863 Hydrogen-Ion Concentration The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D013302 Streptomyces A genus of bacteria that form a nonfragmented aerial mycelium. Many species have been identified with some being pathogenic. This genus is responsible for producing a majority of the ANTI-BACTERIAL AGENTS of practical value.
D013379 Substrate Specificity A characteristic feature of enzyme activity in relation to the kind of substrate on which the enzyme or catalytic molecule reacts. Specificities, Substrate,Specificity, Substrate,Substrate Specificities
D013696 Temperature The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms. Temperatures

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