title: First report of a bifunctional chitinase/lysozyme produced by Bacillus pumilus SG2.
abstract: Bacillus pumilus SG2 isolated from high salinity ecosystem in Iran produces two chitinases (ChiS and ChiL) and secretes them into the medium. In this study, chiS and chiL genes were cloned in pQE-30 expression vector and were expressed in the cytoplasm of Escherichia coli strain M15. The recombinant proteins were purified using Ni-NTA column. The optimum pH and optimum temperature for enzyme activity of ChiS were pH 6, 50°C; those of ChiL were pH 6.5, 40°C. The purified chitinases showed antifungal activity against Fusarium graminearum, Rhizoctonia solani, Magnaporthe grisea, Sclerotinia sclerotiorum, Trichoderma reesei, Botrytis cinerea and Bipolaris sp. Moreover, purified ChiS was identified as chitinase/lysozyme, which are capable of degrading the chitin component of fungal cell walls and the peptidoglycan component of cell walls with many kinds of bacteria (Xanthomonas translucens pv. hordei, Xanthomonas axonopodis pv. citri, Bacillus licheniformis, E. coli C600, E. coli TOP10, Pseudomonas aeruginosa and Pseudomonas putida). Strong homology was found between the three-dimensional structures of ChiS and a chitinase/lysozyme from Bacillus circulans WL-12. This is the first report of a bifunctional chitinase/lysozyme from B. pumilus.
authors: Department of Molecular Genetics, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran. seyedhadi.ghasemi@gmail.com
authors: Seyedhadi
authors: S
authors: Ghasemi
authors: Gholamreza
authors: G
authors: Ahmadian
authors: Mehdi
authors: M
authors: Sadeghi
authors: Daniel R
authors: DR
authors: Zeigler
authors: Heshmatollah
authors: H
authors: Rahimian
authors: Soheila
authors: S
authors: Ghandili
authors: Neda
authors: N
authors: Naghibzadeh
authors: Ali
authors: A
authors: Dehestani
mesh_terms: D000595:Amino Acid Sequence; D000900:Anti-Bacterial Agents / Q000378:metabolism* / Q000494:pharmacology; D000935:Antifungal Agents / Q000378:metabolism* / Q000494:pharmacology; D001407:Bacillus / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D001419:Bacteria / Q000145:classification / Q000187:drug effects; D002686:Chitin / Q000378:metabolism; D002688:Chitinases / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D003001:Cloning, Molecular; D005658:Fungi / Q000145:classification / Q000187:drug effects; D005822:Genetic Vectors; D007492:Iran; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009113:Muramidase / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D010457:Peptidoglycan; D010935:Plant Diseases / Q000382:microbiology; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D017422:Sequence Analysis, DNA
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D010457:Peptidoglycan; D011994:Recombinant Proteins; D002686:Chitin; D002688:Chitinases; D009113:Muramidase