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Mar. Drugs 2014, 12(8), 4693-4712; doi:10.3390/md12084693

Characterization of an Alginate Lyase, FlAlyA, from Flavobacterium sp. Strain UMI-01 and Its Expression in Escherichia coli

1
Laboratory of Marine Biotechnology and Microbiology, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611, Japan
2
Laboratory of Molecular Materials Chemistry, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8626, Japan
3
Hokkaido Industrial Technology Center, Kikyou, Hakodate, Hokkaido 041-0801, Japan
*
Author to whom correspondence should be addressed.
Received: 20 May 2014 / Revised: 27 June 2014 / Accepted: 31 July 2014 / Published: 22 August 2014
(This article belongs to the Special Issue Green Chemistry Approach to Marine Products)
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Abstract

A major alginate lyase, FlAlyA, was purified from the periplasmic fraction of an alginate-assimilating bacterium, Flavobacterium sp. strain UMI-01. FlAlyA showed a single band of ~30 kDa on SDS-PAGE and exhibited the optimal temperature and pH at 55 °C and pH 7.7, respectively. Analyses for substrate preference and reaction products indicated that FlAlyA was an endolytic poly(mannuronate) lyase (EC 4.2.2.3). A gene fragment encoding the amino-acid sequence of 288 residues for FlAlyA was amplified by inverse PCR. The N-terminal region of 21 residues except for the initiation Met in the deduced sequence was predicted as the signal peptide and the following region of six residues was regarded as propeptide, while the C-terminal region of 260 residues was regarded as the polysaccharide-lyase-family-7-type catalytic domain. The entire coding region for FlAlyA was subjected to the pCold I—Escherichia coli BL21(DE3) expression system and ~eight times higher yield of recombinant FlAlyA (recFlAlyA) than that of native FlAlyA was achieved. The recFlAlyA recovered in the periplasmic fraction of E. coli had lost the signal peptide region along with the N-terminal 3 residues of propeptide region. This suggested that the signal peptide of FlAlyA could function in part in E. coli.
Keywords: alginate lyase; polysaccharide-lyase-family 7; Flavobacterium sp. UMI-01; FlAlyA; recombinant alginate lyase alginate lyase; polysaccharide-lyase-family 7; Flavobacterium sp. UMI-01; FlAlyA; recombinant alginate lyase
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Inoue, A.; Takadono, K.; Nishiyama, R.; Tajima, K.; Kobayashi, T.; Ojima, T. Characterization of an Alginate Lyase, FlAlyA, from Flavobacterium sp. Strain UMI-01 and Its Expression in Escherichia coli. Mar. Drugs 2014, 12, 4693-4712.

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