Linked Life Data

21421786

Source:http://linkedlifedata.com/resource/pubmed/id/21421786

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pubmed-article:21421786pubmed:abstractTextEnzymatic processes are useful for industrially important sugar production, and in vitro two-step isomerization has proven to be an efficient process in utilizing readily available sugar sources. A hypothetical uncharacterized protein encoded by ydaE of Bacillus licheniformis was found to have broad substrate specificities and has shown high catalytic efficiency on D-lyxose, suggesting that the enzyme is D-lyxose isomerase. Escherichia coli BL21 expressing the recombinant protein, of 19.5 kDa, showed higher activity at 40 to 45°C and pH 7.5 to 8.0 in the presence of 1.0 mM Mn²+. The apparent K(m) values for D-lyxose and D-mannose were 30.4 ± 0.7 mM and 26 ± 0.8 mM, respectively. The catalytic efficiency (k(cat)/K(m)) for lyxose (3.2 ± 0.1 mM?¹ s?¹) was higher than that for D-mannose (1.6 mM?¹ s?¹). The purified protein was applied to the bioproduction of D-lyxose and D-glucose from d-xylose and D-mannose, respectively, along with the thermostable xylose isomerase of Thermus thermophilus HB08. From an initial concentration of 10 mM D-lyxose and D-mannose, 3.7 mM and 3.8 mM D-lyxose and D-glucose, respectively, were produced by two-step isomerization. This two-step isomerization is an easy method for in vitro catalysis and can be applied to industrial production.lld:pubmed
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pubmed-article:21421786pubmed:authorpubmed-author:LeeSeong-Gene...lld:pubmed
pubmed-article:21421786pubmed:authorpubmed-author:WiSeung GonSGlld:pubmed
pubmed-article:21421786pubmed:authorpubmed-author:BaeHyeun-Jong...lld:pubmed
pubmed-article:21421786pubmed:authorpubmed-author:LeeDae-SeokDSlld:pubmed
pubmed-article:21421786pubmed:authorpubmed-author:PatelDarshan...lld:pubmed
pubmed-article:21421786pubmed:authorpubmed-author:SongYoun-hoYHlld:pubmed
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pubmed-article:21421786pubmed:dateRevised2011-11-1lld:pubmed
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pubmed-article:21421786pubmed:year2011lld:pubmed
pubmed-article:21421786pubmed:articleTitleSubstrate specificity of the Bacillus licheniformis lyxose isomerase YdaE and its application in in vitro catalysis for bioproduction of lyxose and glucose by two-step isomerization.lld:pubmed
pubmed-article:21421786pubmed:affiliationBio-energy Research Institute, Chonnam National University, Gwangju 500-757, Republic of Korea.lld:pubmed
pubmed-article:21421786pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:21421786pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed