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. 1995 Jun;61(6):2420–2424. doi: 10.1128/aem.61.6.2420-2424.1995

Cloning and DNA sequencing of xyaA, a gene encoding an endo-beta-1,4-xylanase from an alkalophilic Bacillus strain (N137).

C Tabernero 1, J Sánchez-Torres 1, P Pérez 1, R I Santamaría 1
PMCID: PMC167514  PMID: 7793963

Abstract

The gene xyaA encoding an alkaline endo-beta 1,4-xylanase from an alkalophilic Bacillus sp. strain (N137) isolated in our laboratory was cloned and expressed in Escherichia coli. The nucleotide sequence of a 1,656-bp DNA fragment containing xyaA was determined, revealing one open reading frame of 993 bp that encodes a xylanase (XyaA) of 39 kDa. This xylanase lacks a typical putative signal peptide, yet the protein is found in the Bacillus culture supernatant. In Escherichia coli, the active protein is located mainly in the periplasmic space. The xylanase activity of the cloned XyaA is an endo-acting enzyme that shows optimal activity at pH 8 and 40 degrees C. This activity is stable at a pH between 6 and 11. Incubations of XyaA at 40 degrees C for 1 h destroyed 45% of the activity.

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Selected References

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