PMID:8829531

Citation	Nishimoto, T, Nakano, M, Nakada, T, Chaen, H, Fukuda, S, Sugimoto, T, Kurimoto, M and Tsujisaka, Y (1996) Purification and properties of a novel enzyme, trehalose synthase, from Pimelobacter sp. R48. Biosci. Biotechnol. Biochem. 60:640-4
Abstract	A novel enzyme, trehalose synthase, was purified from a cell-free extract of Pimelobacter sp. R48 to an electrophoretically homogeneous state by successive chromatographies on DEAE-Toyopearl 650, Butyl-Toyopearl 650, and Mono Q HR5/5 columns. The molecular weight of the enzyme was estimated to be 62,000 by SDS-polyacrylamide gel electrophoresis, and the enzyme had a pI of 4.6 by gel isoelectrofocusing. The enzyme catalyzed the conversion of maltose into trehalose by intramolecular transglucosylation. The enzyme also converted into maltose but was inactive on other saccharides. The N-terminal amino acid of the enzyme was serine. The optimum pH and temperature were pH7.5 and 20 degrees C, respectively. The enzyme was stable in the range of pH 6.0-9.0 and up to 30 degrees C for 60 min. The rate of conversion of maltose into trehalose was independent of the maltose concentration. The maximum yield of trehalose from maltose were 81.8%, 80.9%, and 76.7% at 5, 15, and 25 degrees C, respectively. The activity was inhibited by Cu2+, Hg2+, Ni2+, Zn2+, and Tris.
Links	PubMed
Keywords	Amino Acid Sequence; Amino Acids/analysis; Glucosyltransferases/chemistry; Glucosyltransferases/isolation & purification; Glycosylation; Gram-Positive Asporogenous Rods/genetics; Hydrogen-Ion Concentration; Molecular Sequence Data; Molecular Weight; Substrate Specificity; Temperature
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
PIMSR:TRES		GO:0005992: trehalose biosynthetic process	ECO:0000314:		P		Figure 2: Effect of temperature on activity and thermal stability of trehalose synthase.	complete

References

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