Production, Partial Purification and Biochemical Characterization of Thermostable Xylanase from Bacillus brevis

2013 ◽  
Vol 6 (2) ◽  
pp. 435-440 ◽  
Author(s):  
G.K. Goswami ◽  
R.R. Pathak ◽  
M. Krishnamohan ◽  
B. Ramesh
Keyword(s):  
Biochemical Characterization ◽  
Partial Purification ◽  
Thermostable Xylanase ◽  
Bacillus Brevis

scholarly journals Biochemical Characterization of Cellulase From Bacillus subtilis Strain and its Effect on Digestibility and Structural Modifications of Lignocellulose Rich Biomass

2021 ◽  
Vol 9 ◽  
Author(s):  
Waseem Ayoub Malik ◽  
Saleem Javed
Keyword(s):  
Bacillus Subtilis ◽  
Biochemical Characterization ◽  
Biomass Conversion ◽  
Industrial Applications ◽  
Partial Purification ◽  
Subtilis Strain ◽  
Complex Nature ◽  
Structural Modifications ◽  
Optimum Activity

Microbial cellulases have become the mainstream biocatalysts due to their complex nature and widespread industrial applications. The present study reports the partial purification and characterization of cellulase from Bacillus subtilis CD001 and its application in biomass saccharification. Out of four different substrates, carboxymethyl cellulose, when amended as fermentation substrate, induced the highest cellulase production from B. subtilis CD001. The optimum activity of CMCase, FPase, and amylase was 2.4 U/ml, 1.5 U/ml, and 1.45 U/ml, respectively. The enzyme was partially purified by (NH4)2SO4 precipitation and sequenced through LC-MS/MS. The cellulase was found to be approximately 55 kDa by SDS-PAGE and capable of hydrolyzing cellulose, as confirmed by zymogram analysis. The enzyme was assigned an accession number AOR98335.1 and displayed 46% sequence homology with 14 peptide-spectrum matches having 12 unique peptide sequences. Characterization of the enzyme revealed it to be an acidothermophilic cellulase, having an optimum activity at pH 5 and a temperature of 60°C. Kinetic analysis of partially purified enzyme showed the Km and Vmax values of 0.996 mM and 1.647 U/ml, respectively. The enzyme activity was accelerated by ZnSO4, MnSO4, and MgSO4, whereas inhibited significantly by EDTA and moderately by β-mercaptoethanol and urea. Further, characterization of the enzyme saccharified sugarcane bagasse, wheat straw, and filter paper by SEM, ATR-FTIR, and XRD revealed efficient hydrolysis and structural modifications of cellulosic materials, indicating the potential industrial application of the B. subtilis CD001 cellulase. The findings demonstrated the potential suitability of cellulase from B. subtilis CD001 for use in current mainstream biomass conversion into fuels and other industrial processes.

Partial purification and characterization of a non-cyanobacterial cyanophycin synthetase from Acinetobacter calcoaceticus strain ADP1 with regard to substrate specificity, substrate affinity and binding to cyanophycin

Microbiology ◽  
2004 ◽  
Vol 150 (8) ◽  
pp. 2599-2608 ◽  
Author(s):  
Martin Krehenbrink ◽  
Alexander Steinbüchel
Keyword(s):  
Aspartic Acid ◽  
Biochemical Characterization ◽  
Acinetobacter Calcoaceticus ◽  
Partial Purification ◽  
Atp Binding ◽  
Substrate Affinity ◽  
Two Dimensional Gel Electrophoresis ◽  
Atp Binding Site ◽  
Cyanophycin Synthetase

This study reports, for the first time, purification and biochemical characterization of a cyanophycin synthetase from a non-cyanobacterial strain. Cyanophycin synthetase of Acinetobacter calcoaceticus strain ADP1 was purified 69-fold from recombinant Escherichia coli by two chromatographic steps and one novel affinity step utilizing the Mg2+-dependent binding of the enzyme to cyanophycin. Unlike cyanobacterial cyanophycin synthetases characterized so far, the purified enzyme from A. calcoaceticus strain ADP1 did not accept lysine as an alternative substrate to arginine. The apparent K m-values for arginine (47 μM) and aspartic acid (240 μM) were similar to those of known cyanophycin synthetases from cyanobacteria, but this enzyme had a slightly higher affinity for aspartic acid. In addition, the two different ATP-binding sites of the enzyme were characterized independently of each other with respect to K m values for ATP. The ATP-binding site responsible for the addition of arginine was found to have a much higher affinity for ATP (38 μM) than that responsible for the addition of aspartate (210 mM). Furthermore, the binding of the enzyme to the two possible forms of cyanophycin granule polypeptide (CGP), CGP-Asp and CGP-Arg, was studied. While both forms bound around 30–40 % of the enzyme activity present under the assay conditions, binding was Mg2+-dependent in the case of CGP-Asp. Two-dimensional gel electrophoresis revealed that both forms of cyanophycin were equally abundant in cyanophycin-accumulating cells of A. calcoaceticus ADP1.

Purification and Biochemical Characterization of a Highly Thermostable Xylanase from Actinomadura sp. Strain Cpt20 Isolated from Poultry Compost

2011 ◽  
Vol 166 (3) ◽  
pp. 663-679 ◽  
Author(s):  
Zina Taibi ◽  
Boudjemaa Saoudi ◽  
Mokhtar Boudelaa ◽  
Héla Trigui ◽  
Hafedh Belghith ◽  
...  
Keyword(s):  
Biochemical Characterization ◽  
Thermostable Xylanase

scholarly journals Partial Purification and Characterization of a Heat Stable α-Amylase from a Thermophilic Actinobacteria, Streptomyces sp. MSC702

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Renu Singh ◽  
Vijay Kumar ◽  
Vishal Kapoor
Keyword(s):  
Enzyme Activity ◽  
Biochemical Characterization ◽  
Enzyme Stability ◽  
Potato Starch ◽  
Tween 80 ◽  
Partial Purification ◽  
Amylolytic Enzyme ◽  
Operational Conditions ◽  
Heat Stable

A partial purification and biochemical characterization of the α-amylase from Streptomyces sp. MSC702 were carried out in this study. The optimum operational conditions for enzyme substrate reaction for amylolytic enzyme activity from the strain were evaluated. The optimum pH, temperature, and incubation period for assaying the enzyme were observed to be 5.0, 55°C, and 30 min, respectively. The extracellular extract was concentrated using ammonium sulfate precipitation. It was stable in the presence of metal ions (5 mM) such as K+, Co2+, and Mo2+, whereas Pb2+, Mn2+, Mg2+, Cu2+, Zn2+, Ba2+, Ca2+, Hg2+, Sn2+, Cr3+, Al3+, Ag+, and Fe2+ were found to have inhibitory effects. The enzyme activity was also unstable in the presence of 1% Triton X-100, 1% Tween 80, 5 mM sodium lauryl sulphate, 1% glycerol, 5 mM EDTA, and 5 mM denaturant urea. At temperature 60°C and pH 5.0, the enzyme stability was maximum. α-amylase retained 100% and 34.18% stability for 1 h and 4 h, respectively, at 60°C (pH 7.0). The enzyme exhibited a half-life of 195 min at 60°C temperature. The analysis of kinetic showed that the enzyme has Km of 2.4 mg/mL and Vmax of 21853.0 μmol/min/mg for soluble potato starch. The results indicate that the enzyme reflects their potentiality towards industrial utilization.

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