Hydrophobic interaction chromatography on octyl sepharose--an approach for one-step platform purification of cyclodextrin glucanotransferases.

Shetty, P and Bhat, S and Iyer, JL and Shenoy, S and Pai, JS and Satyamoorthy, K (2011) Hydrophobic interaction chromatography on octyl sepharose--an approach for one-step platform purification of cyclodextrin glucanotransferases. Preparative Biochemistry and Biotechnology , 41 (4). pp. 350-364.

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Abstract

Cyclodextrin glucanotransferase (CGTase) from Bacillus circulans ATCC 21783 was concentrated by ultrafiltration and subsequently purified by hydrophobic interaction chromatography on Octyl Sepharose 4 fast flow. The matrix was able to bind selectively to the enzyme at a very low ammonium sulfate concentration of 0.67 M and enzyme desorption was performed by decreasing gradient of the salt. The overall recovery was 80% with 689-fold purity. CGTases derived from four soil isolates and Toruzyme, the commercial preparation of CGTase, also bound to Octyl Sepharose under similar conditions at 0.67 M and eluted at 0.55-0.5 M of ammonium sulfate. Octyl Sepharose chromatography can thus be used as a platform approach for purification of CGTases from various bacterial sources. Long stretches of sequence predominated by hydrophobic amino acids are reportedly present in the starch binding domains of CGTases. Starch binding experiments indicated the binding of the enzymes to the octyl matrix through these domains.

Item Type: Article
Uncontrolled Keywords: alkalophilic Bacillus , cyclodextrin glucanotransferase, hydrophobic interaction chromatography, Octyl Sepharose, purification, starch binding domain
Subjects: Life Sciences > MLSC Manipal
Depositing User: KMC Manipal
Date Deposited: 01 Feb 2012 06:34
Last Modified: 01 Feb 2012 06:34
URI: http://eprints.manipal.edu/id/eprint/2816

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