title: Study on thermostability of phospholipase D from Streptomyces sp.
abstract: Four phospholipases D (PLDs) in the culture supernatants from Streptomyces strains were purified to conduct a comparative study of their thermostabilities. Among the four purified PLDs, the enzyme from Streptomyces halstedii K1 lost its activity at 45 degrees C. PLD from Streptomyces septatus TH-2 was stable at the same temperature. We determined the nucleotide sequence encoding the PLD gene from S. halstedii K1 (K1PLD). The deduced amino acid sequence showed high homology to that of the PLD gene from S. septatus TH-2 (TH-2PLD). By comparison of the optimum temperature and the thermostability among recombinant PLDs, K1PLD, TH-2PLD and T/KPLD that possessed the N-terminus of TH-2PLD and the C-terminus of K1PLD, T/KPLD showed the properties midway between those of K1PLD and TH-2PLD. It was suggested that the 176 amino acids at C-terminus of Streptomyces PLD were important for its thermostability.
authors.affiliation: Research Institute for Biological Sciences, Okayama (RIBS), 7549-1 Kayo-cho, Jyobo-gun, Okayama, Japan. hatanaka@bio-ribs.com
authors.forename: Tadashi
authors.initials: T
authors.lastname: Hatanaka
authors.forename: Tomofumi
authors.initials: T
authors.lastname: Negishi
authors.forename: Megumi
authors.initials: M
authors.lastname: Kubota-Akizawa
authors.forename: Tairo
authors.initials: T
authors.lastname: Hagishita
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers; D004591:Electrophoresis, Polyacrylamide Gel; D004795:Enzyme Stability; D006358:Hot Temperature; D006868:Hydrolysis; D007700:Kinetics; D008969:Molecular Sequence Data; D010739:Phospholipase D / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013302:Streptomyces / Q000201:enzymology* / Q000235:genetics; D013816:Thermodynamics
chemical_list: D017931:DNA Primers; D011994:Recombinant Proteins; D010739:Phospholipase D