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. 1997 Feb;63(2):661–664. doi: 10.1128/aem.63.2.661-664.1997

Cloning and sequence analysis of genes encoding xylanases and acetyl xylan esterase from Streptomyces thermoviolaceus OPC-520.

H Tsujibo 1, T Ohtsuki 1, T Iio 1, I Yamazaki 1, K Miyamoto 1, M Sugiyama 1, Y Inamori 1
PMCID: PMC168356  PMID: 9023944

Abstract

Three genes encoding two types of xylanases (STX-I and STX-II) and an acetyl xylan esterase (STX-III) from Streptomyces thermoviolaceus OPC-520 were cloned, and their DNA sequences were determined. The nucleotide sequences showed that genes stx-II and stx-III were clustered on the genome. The stx-I, stx-II, and stx-III genes encoded deduced proteins of 51, 35.2, and 34.3 kDa, respectively. STX-I and STX-II bound to both insoluble xylan and crystalline cellulose (Avicel). Alignment of the deduced amino acid sequences encoded by stx-I, stx-II, and stx-III demonstrated that the three enzymes contain two functional domains, a catalytic domain and a substrate-binding domain. The catalytic domains of STX-I and STX-II showed high sequence homology to several xylanases which belong to families F and G, respectively, and that of STX-III showed striking homology with an acetyl xylan esterase from S. lividans, nodulation proteins of Rhizobium sp., and chitin deacetylase of Mucor rouxii. In the C-terminal region of STX-I, there were three reiterated amino acid sequences starting from C-L-D, and the repeats were homologous to those found in xylanase A from S. lividans, coagulation factor G subunit alpha from the horseshoe crab, Rarobacter faecitabidus protease I, beta-1,3-glucanase from Oerskovia xanthineolytica, and the ricin B chain. However, the repeats did not show sequence similarity to any of the nine known families of cellulose-binding domains (CBDs). On the other hand, STX-II and STX-III contained identical family II CBDs in their C-terminal regions.

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Selected References

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