Genome Analysis of Multiple Polysaccharide-Degrading Bacterium Microbulbifer thermotolerans HB226069: Determination of Alginate Lyase Activity

Polysaccharide-degrading bacteria are key participants in the global carbon cycle and algal biomass recycling. Herein, a polysaccharide lyase-producing strain HB226069 was isolated from Sargassum sp. from Qingge Port, Hainan, China. Results of the phylogenetic of the 16S rRNA gene and genotypic anal...

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Veröffentlicht in:Marine biotechnology (New York, N.Y.) N.Y.), 2024-06, Vol.26 (3), p.488-499
Hauptverfasser: Li, Xue, Yang, Miao, Mo, Kunlian, Hu, Yonghua, Gu, Hanjie, Sun, Dongmei, Bao, Shixiang, Huang, Huiqin
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container_title Marine biotechnology (New York, N.Y.)
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creator Li, Xue
Yang, Miao
Mo, Kunlian
Hu, Yonghua
Gu, Hanjie
Sun, Dongmei
Bao, Shixiang
Huang, Huiqin
description Polysaccharide-degrading bacteria are key participants in the global carbon cycle and algal biomass recycling. Herein, a polysaccharide lyase-producing strain HB226069 was isolated from Sargassum sp. from Qingge Port, Hainan, China. Results of the phylogenetic of the 16S rRNA gene and genotypic analysis indicated that the isolate should be classified as Microbulbifer thermotolerans . The whole genome is a 4,021,337 bp circular chromosome with a G+C content of 56.5%. Analysis of the predicted genes indicated that strain HB226069 encoded 161 carbohydrate-active enzymes (CAZymes), and abundant putative enzymes involved in polysaccharide degradation were predicted, including alginate lyase, fucosidase, agarase, xylanase, cellulase, pectate lyase, amylase, and chitinase. Three of the putative polysaccharide lyases from PL7 and PL17 families were involved in alginate degradation. The alginate lyases of strain HB226069 showed the maximum activity of 117.4 U/mL at 50 °C, pH 7.0, and 0.05 M FeCl 3 , while exhibiting the best stability at 30 °C and pH 7.0. The Thin Layer Chromatography (TLC) and Electrospray Ionization Mass Spectrometry (ESI-MS) analyses indicated that the alginate oligosaccharides (AOSs) degraded by the partially purified alginate lyases contained oligosaccharides of DP2–DP5 and monosaccharide while reacting for 36 h. The complete genome of M. thermotolerans HB226069 enriches our understanding of the mechanism of polysaccharide lyase production and supports its potential application in polysaccharide degradation.
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Herein, a polysaccharide lyase-producing strain HB226069 was isolated from Sargassum sp. from Qingge Port, Hainan, China. Results of the phylogenetic of the 16S rRNA gene and genotypic analysis indicated that the isolate should be classified as Microbulbifer thermotolerans . The whole genome is a 4,021,337 bp circular chromosome with a G+C content of 56.5%. Analysis of the predicted genes indicated that strain HB226069 encoded 161 carbohydrate-active enzymes (CAZymes), and abundant putative enzymes involved in polysaccharide degradation were predicted, including alginate lyase, fucosidase, agarase, xylanase, cellulase, pectate lyase, amylase, and chitinase. Three of the putative polysaccharide lyases from PL7 and PL17 families were involved in alginate degradation. The alginate lyases of strain HB226069 showed the maximum activity of 117.4 U/mL at 50 °C, pH 7.0, and 0.05 M FeCl 3 , while exhibiting the best stability at 30 °C and pH 7.0. The Thin Layer Chromatography (TLC) and Electrospray Ionization Mass Spectrometry (ESI-MS) analyses indicated that the alginate oligosaccharides (AOSs) degraded by the partially purified alginate lyases contained oligosaccharides of DP2–DP5 and monosaccharide while reacting for 36 h. 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The Thin Layer Chromatography (TLC) and Electrospray Ionization Mass Spectrometry (ESI-MS) analyses indicated that the alginate oligosaccharides (AOSs) degraded by the partially purified alginate lyases contained oligosaccharides of DP2–DP5 and monosaccharide while reacting for 36 h. The complete genome of M. thermotolerans HB226069 enriches our understanding of the mechanism of polysaccharide lyase production and supports its potential application in polysaccharide degradation.</abstract><cop>New York</cop><pub>Springer US</pub><pmid>38668917</pmid><doi>10.1007/s10126-024-10311-1</doi><tpages>12</tpages></addata></record>
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source MEDLINE; Springer Nature - Complete Springer Journals
subjects Agarase
Algae
Alginate lyase
Alginates
Alginates - metabolism
Alginic acid
amylases
Bacteria
Bacterial Proteins - genetics
Bacterial Proteins - metabolism
Bacteroidetes - enzymology
Bacteroidetes - genetics
Bacteroidetes - metabolism
Base Composition
Biodegradation
biomass
Biomedical and Life Sciences
Carbohydrates
Carbon cycle
Cellulase
China
Chitinase
Chromatography
Chromosomes
Degradation
electrospray ionization mass spectrometry
endo-1,4-beta-glucanase
Engineering
Enzymes
Ferric chloride
Freshwater & Marine Ecology
genes
Genome, Bacterial
Genomes
Genomic analysis
global carbon budget
Ionization
Life Sciences
Lyases
Mass spectrometry
Mass spectroscopy
Microbiology
Microbulbifer
Monosaccharides
Oligosaccharides
Pectate lyase
Phylogenetics
Phylogeny
Polysaccharide-Lyases - genetics
Polysaccharide-Lyases - metabolism
Polysaccharides
Polysaccharides - metabolism
RNA, Ribosomal, 16S - genetics
rRNA 16S
Sargassum
Sargassum - metabolism
Sargassum - microbiology
Seaweed meal
sequence analysis
Thin layer chromatography
Xylanase
xylanases
Zoology
title Genome Analysis of Multiple Polysaccharide-Degrading Bacterium Microbulbifer thermotolerans HB226069: Determination of Alginate Lyase Activity
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