xynB [Mon Aug 31 2015 13:54:30 GMT+0200 (CEST)]

xylan beta-1,4-xylosidase

locus: BSU17580

pI: 5.33

mw: 61.00 kDa

function: xylan degradation

product: xylan beta-1,4-xylosidase

essential: no

ec: 3.2.1.37

synonyms: ynaK

Genomic Context

categories

• [category|SW 2|Metabolism] → [category|SW 2.2|Carbon metabolism] → [category|SW 2.2.2|Utilization of specific carbon sources] → [category|SW 2.2.2.5|Utilization of xylan/ xylose]

syns: ynaK

[SW|Categories] containing this gene/protein

• [SW|utilization of specific carbon sources]

This gene is a member of the following [SW|regulons]

• [SW|CcpA regulon], [SW|XylR regulon]

The protein

Catalyzed reaction/ biological activity

• Hydrolysis of (1->4)-beta-D-xylans, to remove successive D-xylose residues from the non-reducing termini (according to Swiss-Prot)

Protein family

• glycosyl hydrolase 43 family (according to Swiss-Prot)

Structure

• [PDB|1YIF]

[SW|Localization]

• cell membrane (according to Swiss-Prot)

Expression and Regulation

Operon

• ''[protein|search|xynP]-xynB'' (according to [http://dbtbs.hgc.jp/COG/prom/xynPB.html DBTBS])

[SW|Sigma factor]

• [protein|search|SigA] [Pubmed|9973552]

Regulation

• carbon catabolite repression ([protein|search|CcpA]) [Pubmed|9973552]
• induction by xylose ([protein|search|XylR]) [Pubmed|9973552]

Regulatory mechanism

• [protein|search|CcpA]: transcription repression [Pubmed|9973552]
• [protein|search|XylR]: transcription repression [Pubmed|9973552]

References

• 8012596,18757537