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. 1991 May;173(10):3078–3083. doi: 10.1128/jb.173.10.3078-3083.1991

Xylose (glucose) isomerase gene from the thermophile Thermus thermophilus: cloning, sequencing, and comparison with other thermostable xylose isomerases.

K Dekker 1, H Yamagata 1, K Sakaguchi 1, S Udaka 1
PMCID: PMC207900  PMID: 2022613

Abstract

The xylose isomerase gene from the thermophile Thermus thermophilus was cloned by using a fragment of the Streptomyces griseofuscus gene as a probe. The complete nucleotide sequence of the gene was determined. T. thermophilus is the most thermophilic organism from which a xylose isomerase gene has been cloned and characterized. The gene codes for a polypeptide of 387 amino acids with a molecular weight of 44,000. The Thermus xylose isomerase is considerably more thermostable than other described xylose isomerases. Production of the enzyme in Escherichia coli, by using the tac promoter, increases the xylose isomerase yield 45-fold compared with production in T. thermophilus. Moreover, the enzyme from E. coli can be purified 20-fold by simply heating the cell extract at 85 degrees C for 10 min. The characteristics of the enzyme made in E. coli are the same as those of enzyme made in T. thermophilus. Comparison of the Thermus xylose isomerase amino acid sequence with xylose isomerase sequences from other organisms showed that amino acids involved in substrate binding and isomerization are well conserved. Analysis of amino acid substitutions that distinguish the Thermus xylose isomerase from other thermostable xylose isomerases suggests that the further increase in thermostability in T. thermophilus is due to substitution of amino acids which react during irreversible inactivation and results also from increased hydrophobicity.

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Selected References

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