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Isolation and Identification of a New Bacillus Cereus Strain and Characterization of Its Neopullulanase

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Isolation and Identification of a New Bacillus Cereus Strain and Characterization of Its Neopullulanase Original Article pISSN: APPLIED FOOD BIOTECHNOLOGY, 2015, 2(2): 39-45 Journal homepage: www.journals.sbmu.ac.ir/afb 2345-5357 Isolation and Identification of a New Bacillus cereus Strain and Characterization of its Neopullulanase Soheila Davaeifar1, 2, Parvin Shariati1*, Fatemeh Tabandeh1, Bagher Yakhchali1 1Department of Bioprocess Engineering, Faculty of Industrial and Environmental Biotechnology. National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran. 2Department of Microbiology, Jahrom Branch, Islamic Azad University, Jahrom, Iran Abstract Article Info Identification and use of more efficient enzymes in the food and pharmaceutical industries is the focus of many researchers. The aim of this Article history: study was to search for a new bacterial strain capable of producing high levels Received 7 Feb 2015 of pullulanase applicable to biotechnology, the starch bioprocessing and food Revised 23 Feb 2015 industries. A new pullulan hydrolyzing Bacillus strain was isolated and Accepted 23 Feb 2015 designated SDK2. Morphological and biochemical tests identified the strain as a putative Bacillus cereus strain, which was further characterized and confirmed through 16s rRNA sequencing, and was submitted to GeneBank, under the accession number FR6864500. Quantitative analysis of the strain’s Keywords: pullulanase activity was carried out by the Dintrosalicyclic (DNS) acid-based Bacillus cereus, assay. Thin layer chromatography (TLC) of the culture supernatant, identified DNS-based assay, Neopullulanse, the extracellular pullulanase as neopullulanase. Effects of temperature and pH 16s rRNA sequencing, on pullulanase activity were also studied. The optimum conditions for enzyme ° Thin layer chromatography activity, as represented by 60 C and a pH of 7, resulted in an activity of 13.43 U/ml, which is much higher than some of the previously reported activities. However, growth of B. cereus SDK2 was also observed at a pH range of 5 to 10, and temperatures of 30°C to 50°C. The effect of metal ions and reagents, Correspondence to: such as Mg+2, Ca+2, Zn+2, Cu+2, Fe+2, Ni+2 on enzyme activity showed that Ca+2 Dr. Parvin Shariati, ions increased pullulan activity, whereas the other ions and reagents inhibited P. O. BOX 14965/161, pullulanase activity. The ability of B. cereus SDK2 to produce high levels of Tehran, Iran. ° Tel: 0098-2144787357 neopullulanase stable at 60 C that can generate panose from pullulan, make Fax: 0098-2144787399, this newly isolated strain a valuable source of debranching enzyme for E-mail: [email protected] biotechnology, the starch bioprocess and medical industries. 1. Introduction oligosaccharides, which includes α-amylase, Starch, as the most common storage pullulanase, cyclomaltodextrinases and cyclodextrin polysaccharide in plants, is an inexpensive substrate glycosyltransferase. Pullulanase (pullulan-6- with extensive cost-effective benefits for the food glucanohydrolase) is a debranching enzyme that industry [1]. Starch is made up of two components; specifically acts on the α-1,6 linkages in pullulan, the linear polymer known as amylose and the starch and related polysaccharides. This enzyme, as a branched amylopectin. The entire carbohydrate starch debranching enzyme, is especially important in molecule contains α-glucose units that are linked biotechnology and the starch bioprocessing industry together with α-1, 4 and α-1, 6 glycosidic linkages [2, and is used with other enzymes, such as α-amylase, β- 3]. The α-amylase family consists of several enzymes amylase and glucoamylase for improvement of the that convert starch and related substrates to mono- and saccharification rate and yield to produce sugar and Study of a neopullulase from Bacillus cereus glucose syrups [4, 5, 6]. There are numerous reports the larger and more transparent (stronger) haloes were regarding mesophilic, thermophilic and hyper- selected, from which the best strain was selected for thermophilic bacteria and archaea that produce identification and further analysis. pullulanases. In fact, industrial processes mostly prefer the extracellular enzymes that are secreted by 2.2. Bacterial identification and sequencing microorganisms. So searching for new bacteria that Identification was carried out using morphological produce more and efficient pullulanases has always (Gram staining and light microscopy), biochemical been an ongoing process [7, 8]. Pullulan is a linear (API kit (Biomerieux Co., France) and molecular polymer that is composed of maltotriose units linked methods (16sS rRNA sequencing). For the purpose of by α-1,6 glycosidic linkages. Based on the substrate molecular identification, genomic DNA was extracted specificity and the type of end products, pullulan- using a DNA extraction kit (Roche Co., Germany) and hydrolyzing enzymes have been identified and purified according to Sambrook and Russsell [12]. classified into 5 groups [9], which include (i) The purity of the DNA was checked spectrophotometrically by measuring A260/A280. pullulanase type I (EC 3.2.1.41) that attacks α-1,6 The PCR amplification of the 16S rRNA gene glycosidic linkages of pullulan (or the branched from the template (extracted genomic DNA of the substrate) and produces maltotriose; (ii) pullulanase putative Bacillus cereus, designated SDK2) was type II (amylopullulanase) is able to attack α-1,4 carried out with two universal primers; forward (5’- glycosidic linkages of pullulan (and related AGAGTTTGATCCTGGCTTA-3’) and reverse (5’- polysaccharides) despite the presence of α-1,6 TAAGGAGGTGATCCAGC-3’). PCR was carried glycosidic linkages, producing maltotriose, maltose out in a thermocycler with the following program: (1) and glucose; (iii) pullulan hydrolase type I an initial denaturation at 95°C for 10 min, (followed (neopullulanase, EC 3.2.1.135) is able to attack the α- by 30 cycles each consisting of 1 min at 94°C, 40s at 1,4 glycosidic linkages of pullulan, producing panose; 54°C and 1 min at 72°C, with a final extension at 72°C (IV) pullulan hydrolase type II (isopullulanase, EC for 10 min [12]. The amplified products were purified 3.2.1.57) acts on pullulan producing isopanose; (V) with the High Pure PCR Product purification kit and pullulan hydrolase type III is able to attack both α- (Roch Co, Germany) and DNA sequencing was then 1,4 and α-1,6 glycosidic linkages of pullulan, carried out on both strands. The Blast search producing maltotriose, maltose and panose [9]. All algorithm (http://www.ebi.ac.uk/embl/) was used for pullulanases, with the exception of neopullulanase and alignment and homology search. The 16s rRNA isopullulanase, are unable to act on cyclodextrins. sequence of the identified bacterial strain was Such kinds of enzymes are known as cyclodextrinases submitted to Genbank under the accession no. that are capable of acting on cyclodextrins much faster FR686500. than starch [10]. Pullulanases are used at or above 60°C for the saccharification process, so thermal 2.3. Growth conditions for pullulan production Modified BSS (Bacillus Spizizen Salts) minimal stability of these enzymes is of vital importance to medium was selected as the cultivation medium that such industries [7]. In accordance with the significant -1 had the following composition (gl ); 14, K HPO ; 6, role of this enzyme in Biotechnology and the starch 2 4 KH2PO4; 2, (NH4)2SO4; 0.2, Trisodium citrate; 0.2, industry and the saccharification process, this study MgSO4.2H2O; and trace elements solution (MgCl2, aimed to search for a new bacterial strain capable of - ZnSO4, FeCl3, CaCl2, at the final concentration of 10 producing high levels of pullulanase applicable to 6M). The pH of the BSS medium was adjusted to 7. such industries. Bacillus cereus SDK2 was grown LB medium for 18 h at 37°C, with shaking at 200 rpm, and was then used 2. Materials and Methods to inoculate BSS medium (at a concentration of 1% 2.1. Bacterial strains and culture (v/v)) containing 6 gl-1 of pullulan (% 0.6 (v/v)), and Bacterial strains were isolated from various incubated at 37°C for 48 h at 200 rpm [7, 8, 9]. locations of three industrial sites that included non- Sampling from the culture medium was carried out alcoholic beverage, gluten and flour companies, in every 3 h and growth was monitored by measuring the Tehran, Iran. Samples taken from these sites were optical density of the culture medium at 600 nm using serially diluted with distilled water and spread onto a UV/VIS spectrophotometer (Beckman Co, Luria bertani (LB) agar plates, and then incubated for Germany) [13]. Samples collected at regular time ° intervals were then centrifuged at 5000 g for 15 min at 24 h at 37 C. Individual colonies were then picked ° resulting in the selection of 73 amylolytic isolates. 4 C. The resulting cell-free supernatant was used as a The 73 samples were subsequently cultured on crude source of enzyme in the following enzyme -1 assays. pullulan agar (gl ; 2, pullulan; 16, agar) and incubated at 37°C for 48h. Pullulan-degrading bacteria were 2.4. Enzyme assay identified by the presence of clear zones (haloes) Pullulanase activity was determined by around colonies, after immersing the culture in ethanol modification of the method by Kanno and Tomimura (99 % (v/v)) for 3 h [11]. Consequently, colonies with 40 Appl Food Biotechnol, Vol. 2, No. 2 (2015) Davaeifar et al. (1985), at 37°C as the amount of enzyme that is as described above [10]. Reaction mixture devoid of required to produce reduced sugars from pullulan [14]. metal ions and reagents was used as a control. A 150 µl sample of the cell- free supernatant was 2.8. Statistical Analysis added to 150 µl of 0.1M sodium phosphate buffer pH Statistical analyses were carried out using the 7 containing 1% (w/v) pullulan. A same volume of SPSS software version 16.0 (SPSS, Chicago, IL, cell-free supernatant in 0.1M sodium phosphate buffer USA). The independent Student’s t-test was used to (pH 7) devoid of pullulan was used as a blank.
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