Applied Microbiology and Biotechnology

, Volume 86, Issue 6, pp 1821–1828

Molecular cloning and characterization of amylase from soil metagenomic library derived from Northwestern Himalayas

  • Sarika Sharma
  • Farrah Gul Khan
  • Ghulam Nabi Qazi
Biotechnologically Relevant Enzymes and Proteins

DOI: 10.1007/s00253-009-2404-y

Cite this article as:
Sharma, S., Khan, F.G. & Qazi, G.N. Appl Microbiol Biotechnol (2010) 86: 1821. doi:10.1007/s00253-009-2404-y

Abstract

The increasing demand for novel biocatalysts stimulates exploration of resources from soil. Metagenomics, a culture independent approach, represent a sheer unlimited resource for discovery of novel biocatalysts from uncultured microorganisms. In this study, a soil-derived metagenomic library containing 90,700 recombinants was constructed and screened for lipase, cellulase, protease and amylase activity. A gene (pAMY) of 909 bp encoding for amylase was found after the screening of 35,000 Escherichia coli clones. Amino acid sequence comparison and phylogenetic analysis indicated that pAMY was closely related to uncultured bacteria. The molecular mass of pAMY was estimated about 38 kDa by sodium dodecyl sulphate polyacrylamide gel electrophoresis. Amylase activity was determined using soluble starch, amylose, glycogen and maltose as substrates. The maximal activity (2.46 U/mg) was observed at 40 °C under nearly neutral pH conditions with amylose; whereas it retains 90% of its activity at low temperature with all the substrates used in this study. The ability of pAMY to work at low temperature is unique for amylases reported so far from microbes of cultured and uncultured division.

Keywords

MetagenomeAmylaseNorthwestern Himalayas

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Sarika Sharma
    • 1
  • Farrah Gul Khan
    • 1
  • Ghulam Nabi Qazi
    • 1
  1. 1.Biotechnology DivisionIndian Institute of Integrative Medicine (Council of Scientific and Industrial Research)JammuIndia