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Purification and Characterization of a Maltopentaose-producing Amylase from Bacillus megaterium KSM B-404.  

박제원 (고려대학교 생명공학원)
김병주 (㈜태평양 기술연구원)
이재우 (김천대학 식품영양과)
김영배 (고려대학교 생명공학원)
Publication Information
Microbiology and Biotechnology Letters / v.30, no.4, 2002 , pp. 352-358 More about this Journal
Abstract
An amylase that hydrolyzes starch into maltopentaose as a main product was found in the culture supernatant of a strain of Bacillus megaterium KSM B-404 isolated from local soil. The enzyme was purified 129-fold by ammonium sulfate precipitation, DEAE-Toyopearl and Superdex 75 HR 10/30 column using a FPLC system. The molecular weight of the amylase was determined as about 68 kDa by using SDS-PAGE. Optimum pH and temperature of amylase were found to be $50^{\circ}C$ and pH 6.0~7.0, respectively. The enzyme was stable up to $60^{\circ}C$ by addition of $Ca^{2+}$ and its pH stability was in the range of 6.0~10.0. The activity of enzyme was inhibited by $Cu^{2+}$ $Hg^{2+}$ , and $Fe^{3+}$ and maintained by $Ca^{2+}$ and $Mg^{2+}$ . EDTA and pCMB also showed inhibitory effect to the enzyme. TLC and HPLC analysis of the products of the enzyme reaction showed the presence of maltopentaose(52%), maltotriose (25%), maltose (11%), glucose, and maltotetraose in the starch hydrolysates.
Keywords
Maltopentaose; Bacillus megaterium KSM B-404; amylase;
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