Substrate induction of isomaltulose synthase in a newly isolated Klebsiella sp. LX3.

Abstract:

AIMS:Production of isomaltulose by newly isolated Klebsiella sp. LX3. METHODS AND RESULTS:The bacterial isolate LX3, which transforms sucrose to isomaltulose and trehalulose, has been isolated from a soil sample in Singapore. Morphological and biochemical analysis, as well as 16s rRNA sequence demonstrated that the isolate could represent a new member of genus Klebsiella. The strain has several interesting features. The immobilized cells of Klebsiella sp. LX3 convert more than 99% of sucrose to products that consist of more than 87% of isomaltulose, 11.6% of trehalulose, and <1% of glucose. CONCLUSIONS:The production of isomaltulose synthase in isolate LX3 is inducible by its substrate sucrose and the sugars containing a fructofuranosyl group. SIGNIFICANCE AND IMPACT OF STUDY:It would be useful for future biotechnological applications to understand the structural features or motifs of the isomaltulose synthases that determine the sucrose conversion efficiency and the ratio of the conversion products.

journal_name

J Appl Microbiol

authors

Li X,Zhao C,An Q,Zhang D

doi

10.1046/j.1365-2672.2003.02006.x

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

521-7

issue

3

eissn

1364-5072

issn

1365-2672

pii

2006

journal_volume

95

pub_type

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