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Cite: NAR/gkaa742 2020



PUL General Information

Literature Information

PUL ID

PUL0191

PubMed

26920945, BMC Genomics. 2016 Feb 27;17:147. doi: 10.1186/s12864-016-2472-1.

Characterization method

RNA-Seq,RT-PCR,qPCR

Genomic accession number

FP929033.1

Nucelotide position range

3988941-4010183

Substrate

pectin

Loci

BXY_31910-BXY_32010

Species

Bacteroides xylanisolvens/371601

Degradation or Biosynthesis

degradation

Gene Name

Locus Tag

Protein ID

Gene Position

GenBank Contig Range

EC Number

- BXY_31910 CBK68198.1 0 - 1149 (+) FP929033.1:3988941-3990090 -
- BXY_31920 CBK68199.1 1158 - 2130 (+) FP929033.1:3990099-3991071 -
- BXY_31930 CBK68200.1 2245 - 2419 (+) FP929033.1:3991186-3991360 -
- BXY_31940 CBK68201.1 2519 - 4238 (+) FP929033.1:3991460-3993179 -
- BXY_31950 CBK68202.1 4570 - 5911 (+) FP929033.1:3993511-3994852 -
- BXY_31960 CBK68203.1 5953 - 10576 (+) FP929033.1:3994894-3999517 -
- BXY_31970 CBK68204.1 10803 - 12399 (-) FP929033.1:3999744-4001340 -
- BXY_31980 CBK68205.1 12417 - 14472 (-) FP929033.1:4001358-4003413 -
- BXY_31990 CBK68206.1 14458 - 17680 (-) FP929033.1:4003399-4006621 -
- BXY_32000 CBK68207.1 17977 - 19618 (+) FP929033.1:4006918-4008559 4.2.2.2
- BXY_32010 CBK68208.1 19659 - 21243 (+) FP929033.1:4008600-4010184 4.2.2.2

Cluster number

1

Gene name

Gene position

Gene type

Found by CGCFinder?

- 1 - 1149 (+) CAZyme: GH105 Yes
- 1159 - 2130 (+) CAZyme: CE8 Yes
- 2246 - 2419 (+) other Yes
- 2520 - 4238 (+) CAZyme: CE8|CE12|CE4 Yes
- 4571 - 5911 (+) STP: STP|AAA Yes
- 5954 - 10576 (+) TF: DBD-Pfam|HTH_AraC,DBD-SUPERFAMILY|0035607 Yes
- 10804 - 12399 (-) other Yes
- 12418 - 14472 (-) other Yes
- 14459 - 17680 (-) TC: gnl|TC-DB|Q45780|1.B.14.6.1 Yes
- 17978 - 19618 (+) CAZyme: PL1_2 Yes
- 19660 - 21243 (+) CAZyme: PL1_2 Yes

PUL ID

PUL0191

PubMed

26920945, BMC Genomics. 2016 Feb 27;17:147. doi: 10.1186/s12864-016-2472-1.

Title

Unraveling the pectinolytic function of Bacteroides xylanisolvens using a RNA-seq approach and mutagenesis.

Author

Despres J, Forano E, Lepercq P, Comtet-Marre S, Jubelin G, Yeoman CJ, Miller ME, Fields CJ, Terrapon N, Le Bourvellec C, Renard CM, Henrissat B, White BA, Mosoni P

Abstract

BACKGROUND: Diet and particularly dietary fibres have an impact on the gut microbiome and play an important role in human health and disease. Pectin is a highly consumed dietary fibre found in fruits and vegetables and is also a widely used additive in the food industry. Yet there is no information on the effect of pectin on the human gut microbiome. Likewise, little is known on gut pectinolytic bacteria and their enzyme systems. This study was undertaken to investigate the mechanisms of pectin degradation by the prominent human gut symbiont Bacteroides xylanisolvens. RESULTS: Transcriptomic analyses of B. xylanisolvens XB1A grown on citrus and apple pectins at mid- and late-log phases highlighted six polysaccharide utilization loci (PUL) that were overexpressed on pectin relative to glucose. The PUL numbers used in this report are those given by Terrapon et al. (Bioinformatics 31(5):647-55, 2015) and found in the PUL database: http://www.cazy.org/PULDB/. Based on their CAZyme composition, we propose that PUL 49 and 50, the most overexpressed PULs on both pectins and at both growth phases, are involved in homogalacturonan (HG) and type I rhamnogalacturonan (RGI) degradation, respectively. PUL 13 and PUL 2 could be involved in the degradation of arabinose-containing side chains and of type II rhamnogalacturonan (RGII), respectively. Considering that HG is the most abundant moiety (>70%) within pectin, the importance of PUL 49 was further investigated by insertion mutagenesis into the susC-like gene. The insertion blocked transcription of the susC-like and the two downstream genes (susD-like/FnIII). The mutant showed strong growth reduction, thus confirming that PUL 49 plays a major role in pectin degradation. CONCLUSION: This study shows the existence of six PULs devoted to pectin degradation by B. xylanisolvens, one of them being particularly important in this function. Hence, this species deploys a very complex enzymatic machinery that probably reflects the structural complexity of pectin. Our findings also highlight the metabolic plasticity of B. xylanisolvens towards dietary fibres that contributes to its competitive fitness within the human gut ecosystem. Wider functional and ecological studies are needed to understand how dietary fibers and especially plant cell wall polysaccharides drive the composition and metabolism of the fibrolytic and non-fibrolytic community within the gut microbial ecosystem.