Use of a packed-column bioreactor for isolation of diverse protease-producing bacteria from antarctic soil

Nathalie Wery, Ursula Gerike, Ajay Sharman, Julian B. Chaudhuri, David W. Hough, Michael J. Danson

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

Seventy-five aerobic heterotrophs have been isolated from a packed-column bioreactor inoculated with soil from Antarctica. The column was maintained at 10degreesC and continuously fed with a casein-containing medium to enrich protease producers. Twenty-eight isolates were selected for further characterization on the basis of morphology and production of clearing zones on skim milk plates. Phenotypic tests indicated that the strains were mainly psychrotrophs and presented a high morphological and metabolical diversity. The extracellular protease activities tested were optimal at neutral pH and between 30 and 45degreesC. 16S ribosomal DNA sequence analyses showed that the bioreactor was colonized by a wide variety of taxons, belonging to various bacterial divisions: alpha-, beta-, and gamma-Proteobacteria; the Flexibacter-Cytophaga-Bacteroides group; and high G+C gram-positive bacteria and low G+C gram-positive bacteria. Some strains represent candidates for new species of the genera Chryseobacterium and Massilia. This diversity demonstrates that the bioreactor is an efficient enrichment tool compared to traditional isolation strategies.
Original languageEnglish
Pages (from-to)1457-1464
Number of pages8
JournalApplied and Environmental Microbiology
Volume69
Issue number3
DOIs
Publication statusPublished - 2003

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