Isolation of novel lipolytic genes from uncultured bacteria of pond water.
Metagenomic libraries give access to gene pool of bacteria present in environmental samples avoiding the culture bias. A metagenomic library of pond water microbial assemblage in plasmid vector containing about 532 Mb of community DNA was prepared. Screening of a part of the unamplified library resulted in isolation of 11 unique lipolytic clones with an ability to hydrolyze tributyrin. DNA sequence of the lipolytic genes varied in G+C composition from 57% to 75%. Twelve lipolytic genes encoding proteins with 25-70% amino acid identity with proteins in the databases were identified. Ten of the encoded proteins belonged to seven known lipolytic protein families. One of the proteins was similar to recently identified esterase BioH. A lipolytic protein with high similarity to yet uncharacterized alpha/beta hydrolase protein family abh_upf0017 was identified from one of the clones. Conserved motif for lipolytic enzymes GXSXG, conserved aspartic and histidine residues were identified in this encoded protein.
Ranjan
Ravi
R
Department of Environmental Biology, University of Delhi, Delhi 110007, India.
Grover
Amit
A
Kapardar
Raj Kishor
RK
Sharma
Rakesh
R
D000595:Amino Acid Sequence; D001419:Bacteria / Q000235:genetics*; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D003001:Cloning, Molecular; D019295:Computational Biology; D017124:Conserved Sequence; D046508:Culture Techniques; D005618:Fresh Water / Q000382:microbiology*; D015723:Gene Library; D005798:Genes, Bacterial / Q000235:genetics*; D050356:Lipid Metabolism; D008969:Molecular Sequence Data; D016415:Sequence Alignment; D014871:Water Microbiology
D001426:Bacterial Proteins