PUL ID

PUL0378

PubMed

18996345, Cell Host Microbe. 2008 Nov 13;4(5):447-57. doi: 10.1016/j.chom.2008.09.007.

Characterization method

microarray, qPCR

Genomic accession number

AE015928.1

Nucelotide position range

4893415-4928241

Substrate

alpha-mannan

Loci

BT_3773-BT_3792

Species

Bacteroides thetaiotaomicron/818

Degradation or Biosynthesis

degradation

Cluster number

1

Gene name

Gene position

Gene type

Found by CGCFinder?

- 1 - 2262 (+) CAZyme: GH92 Yes
- 2527 - 6123 (-) CAZyme: CBM32|GH38 Yes
- 6719 - 7393 (-) CAZyme: GT32 Yes
- 7415 - 8116 (-) CAZyme: GT32 Yes
- 8122 - 8922 (-) other Yes
- 9006 - 9950 (-) other Yes
- 10034 - 11455 (-) other Yes
- 11703 - 12854 (-) CAZyme: GH130 Yes
- 13305 - 14750 (-) CAZyme: GH125 Yes
- 14796 - 15959 (-) CAZyme: GH76 Yes
- 15994 - 16941 (-) other Yes
- 17000 - 19282 (-) CAZyme: GH92 Yes
- 19279 - 19503 (-) other Yes
- 19492 - 23529 (+) TF: DBD-Pfam|HTH_AraC,DBD-SUPERFAMILY|0035607 Yes
- 24048 - 25406 (+) other Yes
- 25429 - 28530 (+) TC: gnl|TC-DB|Q45780|1.B.14.6.1 Yes
- 28550 - 30529 (+) other Yes
- 30548 - 31522 (+) other Yes
- 31593 - 33230 (+) other Yes
- 33250 - 34827 (+) CAZyme: GH76 Yes

PUL ID

PUL0378

PubMed

18996345, Cell Host Microbe. 2008 Nov 13;4(5):447-57. doi: 10.1016/j.chom.2008.09.007.

Title

Mucosal glycan foraging enhances fitness and transmission of a saccharolytic human gut bacterial symbiont.

Author

Martens EC, Chiang HC, Gordon JI

Abstract

The distal human gut is a microbial bioreactor that digests complex carbohydrates. The strategies evolved by gut microbes to sense and process diverse glycans have important implications for the assembly and operation of this ecosystem. The human gut-derived bacterium Bacteroides thetaiotaomicron forages on both host and dietary glycans. Its ability to target these substrates resides in 88 polysaccharide utilization loci (PULs), encompassing 18% of its genome. Whole genome transcriptional profiling and genetic tests were used to define the mechanisms underlying host glycan foraging in vivo and in vitro. PULs that target all major classes of host glycans were identified. However, mucin O-glycans are the principal host substrate foraged in vivo. Simultaneous deletion of five genes encoding ECF-sigma transcription factors, which activate mucin O-glycan utilization, produces defects in bacterial persistence in the gut and in mother-to-offspring transmission. Thus, PUL-mediated glycan catabolism is an important component in gut colonization and may impact microbiota ecology.