Overview of the glucansucrase equipment of Leuconostoc citreum LBAE-E16 and LBAE-C11, two strains isolated from sourdough

FEMS Microbiology Letters
Myriam AmariCatherine Fontagné-Faucher

Abstract

The whole set of putative glucansucrases from Leuconostoc citreum LBAE-E16 and LBAE-C11 was retrieved from the draft genome sequence of these two sourdough strains previously suggested as alternan producers. Four and five putative glycoside hydrolase family 70 (GH70) encoding genes were identified in the genome sequence of strain C11 and E16, respectively. Some putative genes have high sequence identity to known Leuconostoc dextransucrases. Molecular and biochemical data confirmed that L. citreum C11 could be considered as a new alternan-producing strain, unlike strain E16. In the latter, two new putative glucansucrases with unusual structural features were retrieved. In particular, the GSE16-5 gene encodes for a protein of 2063 amino acids with a theoretical molecular mass of 229 kDa that shares 61% identity with the alternansucrase (ASR) of L. citreum NRRL B-1355, due to the presence of seven APY repeats identified in the C-terminal peptide sequence. Cloning and expression of the corresponding coding sequence revealed synthesis of a low molecular weight (10(4) Da) linear dextran polymer with glucosyl residues only linked by α-1,6 linkages. This novel GH70 enzyme may thus be viewed as a natural chimeric enzyme resulting from t...Continue Reading

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Citations

May 5, 2016·Cellular and Molecular Life Sciences : CMLS·Claire MoulisMagali Remaud-Simeon
Sep 30, 2020·World Journal of Microbiology & Biotechnology·Peteris ZikmanisPavels Semjonovs
Feb 12, 2020·Enzyme and Microbial Technology·Iis SeptianaDoman Kim
May 28, 2019·Journal of Agricultural and Food Chemistry·Franziska MünkelDaniel Wefers

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