Characterization of gene encoding amylopullulanase from plant-originated lactic acid bacterium, Lactobacillus plantarum L137.
A starch-hydrolyzing lactic acid bacterium, Lactobacillus plantarum L137, was isolated from traditional fermented food made from fish and rice in the Philippines. A gene (apuA) encoding an amylolytic enzyme from Lactobacillus plantarum L137 was cloned, and its nucleotide sequence was determined. The apuA gene consisted of an open reading frame of 6171 bp encoding a protein of 2056 amino acids, the molecular mass of which was calculated to be 215,625 Da. The catalytic domains of amylase and pullulanase were located in the same region within the middle of the N-terminal region. The deduced amino acid sequence revealed four highly conserved regions that are common among amylolytic enzymes. In the N-terminal region, a six-amino-acid sequence (Asp-Ala/Thr-Ala-Asn-Ser-Thr) is repeated 39 times, and a three-amino-acid sequence (Gln-Pro-Thr) is repeated 50 times in the C-terminal region. The apuA gene was subcloned in L. plantarum NCL21, which is a plasmid-cured derivative of the wild-type L137 strain and has no amylopullulanase activity, and the gene was overexpressed under the control of its own promoter. The ApuA enzyme from this recombinant L. plantarum NCL21 harboring apuA gene was purified. The enzyme has both alpha-amylase and pullulanase activities. The N-terminal sequence of the purified enzyme showed that the signal peptide was cleaved at Ala(36) and the molecular mass of the mature extracellular enzyme is 211,537 Da. The major reaction products from soluble starch were maltotriose (G3) and maltotetraose (G4). Only maltotriose (G3) was produced from pullulan. From these results, we concluded that ApuA is an amylolytic enzyme belonging to the amylopullulanase family.
Kim
Jong-Hyun
JH
Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan.
Sunako
Michihiro
M
Ono
Hisayo
H
Murooka
Yoshikatsu
Y
Fukusaki
Eiichiro
E
Yamashita
Mitsuo
M
D000595:Amino Acid Sequence; D000681:Amylases / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D020134:Catalytic Domain; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D006026:Glycoside Hydrolases / Q000235:genetics* / Q000378:metabolism; D019344:Lactic Acid / Q000378:metabolism*; D048191:Lactiplantibacillus plantarum / Q000378:metabolism*; D008320:Maltose / Q000031:analogs & derivatives / Q000737:chemistry; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D011994:Recombinant Proteins / Q000737:chemistry; D014312:Trisaccharides / Q000737:chemistry
D001426:Bacterial Proteins; D011994:Recombinant Proteins; D014312:Trisaccharides; D019344:Lactic Acid; C008317:maltotriose; D008320:Maltose; C009819:maltotetraose; D000681:Amylases; D006026:Glycoside Hydrolases; C082507:amylopullulanase