Summary
To exploit alginate lyase which could degrade bacterial alginates, degenerate PCR and long range-inverse PCR (LR-IPCR) were used to isolate alginate lyase genes from soil bacteria. Gene algL, an alginate lyase-encoding gene from Pseudomonas sp. QD03 was cloned, and it was composed of a 1122 bp open reading frame (ORF) encoding 373 amino acid residues with the calculated molecular mass of 42.2 kDa. The deduced protein had a potential N-terminal signal peptide of 20 amino acid residues that was consistent with its proposed periplasmic location. Gene algL was expressed in pET24a (+)/E. coli BL21 (DE3) system. The recombinant AlgL was purified to electrophoretic homogeneity using affinity chromatography. The molecular weight of AlgL was estimated to be 42.8 kDa by SDS-PAGE. AlgL exhibited maximal activity at pH 7.5 and 37 °C. Na+, K+, Ca2+ and Ba2+ significantly enhanced the activity of AlgL. AlgL could degrade alginate and mannuronate blocks, but hardly degrade guluronate blocks. In particular, AlgL could degrade acetylated alginate of Pseudomonas aeruginosa FRD1 (approximately 0.54 mol of O-acetyl group per mol of alginate). It might be possible to use alginate lyase AlgL as an adjuvant therapeutic medicine for the treatment of disease associated with P. aeruginosa infection.
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Xiao, L., Han, F., Yang, Z. et al. A Novel Alginate Lyase with High Activity on Acetylated Alginate of Pseudomonas aeruginosa FRD1 from Pseudomonas sp. QD03. World J Microbiol Biotechnol 22, 81–88 (2006). https://doi.org/10.1007/s11274-005-7713-4
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DOI: https://doi.org/10.1007/s11274-005-7713-4