title: Production of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) depolymerase from Aspergillus sp. NA-25.
abstract: Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) degrading thermophilic fungus was isolated from soil sample collected from waste disposal site, Islamabad, Pakistan. It was able to grow efficiently on a medium containing PHBV as a sole source of carbon and has been identified as Aspergillus sp. NA-25 by 18S rRNA. Using 9% of inoculum maximum production of PHBV depolymerase was observed at 45 degrees C, pH 7.0 in the presence of 0.2% lactose as an additional carbon source. PHBV depolymerase was purified by precipitation with 80% ammonium sulfate and gel filtration chromatography on Sephadex G-75. The four enzyme forms obtained after gel filtration were analyzed on SDS-PAGE and their molecular weights (36, 68, 72 and 90 kDa) were determined. They were characterized on the basis of effect of different temperatures, pH, metal ions and different reagents on the PHBV activity and stability. It is obvious that the fungal strain Aspergillus sp. NA-25 is capable of degrading PHBV with the help of different types of depolymerases.
authors.affiliation: Department of Microbiology, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan alishah_75@yahoo.com
authors.forename: A
authors.initials: A
authors.lastname: Nadhman
authors.forename: F
authors.initials: F
authors.lastname: Hasan
authors.forename: Z
authors.initials: Z
authors.lastname: Shah
authors.forename: A
authors.initials: A
authors.lastname: Hameed
authors.forename: A A
authors.initials: AA
authors.lastname: Shah
mesh_terms: D001230:Aspergillus / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D002850:Chromatography, Gel; D004591:Electrophoresis, Polyacrylamide Gel; D004795:Enzyme Stability; D005656:Fungal Proteins / Q000302:isolation & purification / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D006867:Hydrolases / Q000302:isolation & purification / Q000378:metabolism*; D011091:Polyesters / Q000378:metabolism*; D012337:RNA, Ribosomal, 18S; D012988:Soil Microbiology; D013696:Temperature; D000094122:Polyhydroxybutyrates
chemical_list: D005656:Fungal Proteins; D006867:Hydrolases; D011091:Polyesters; D012337:RNA, Ribosomal, 18S; C052620:poly(3-hydroxybutyrate)-co-(3-hydroxyvalerate); D000094122:Polyhydroxybutyrates; C577883:poly(3-hydroxybutyrate-co-3-hydroxyvalerate)depolymerase, Aspergillus