Thermostable Alkaline Serine Protease Production by the Soil Myxobacterium of Archangium sp. UTMC 4504

2021 ◽  
Author(s):  
Nasim Rouhizohrab ◽  
Fatemeh Mohammadipanah
Keyword(s):  
Serine Protease ◽  
Protease Production ◽  
Alkaline Serine Protease

Molecular Cloning, Nucleotide Sequence, and Expression of the Structural Gene for Alkaline Serine Protease from AlkaliphilicBacillussp. 221

1992 ◽  
Vol 56 (9) ◽  
pp. 1455-1460 ◽  
Author(s):  
Hideto Takami ◽  
Tetsuo Kobayashi ◽  
Masato Kobayashi ◽  
Mami Yamamoto ◽  
Satoshi Nakamura ◽  
...  
Keyword(s):  
Nucleotide Sequence ◽  
Molecular Cloning ◽  
Serine Protease ◽  
Structural Gene ◽  
Alkaline Serine Protease

Production, purification and characterization of thermomycolase, the extracellular serine protease of the thermophilic fungus Malbranchea pulchella var. sulfurea

1976 ◽  
Vol 22 (2) ◽  
pp. 165-176 ◽  
Author(s):  
Poh Seng Ong ◽  
G. Maurice Gaucher
Keyword(s):  
Serine Protease ◽  
Thermophilic Fungus ◽  
Amino Acid Residues ◽  
Submerged Cultures ◽  
Ph Optimum ◽  
Alkaline Serine Protease ◽  
Associated Production ◽  
Specificity Study ◽  
Malbranchea Pulchella ◽  
The Stability

The thermophilic fungus Malbranchea pulchella produces a single extracellular, alkaline, serine protease when grown at 45 °C, on 2% casein as sole carbon source. The growth-associated production of protease in submerged cultures was inhibited by addition of glucose, amino acids, or yeast extract. A simple four-step purification which yields homogeneous protease in 78% yield is described. The protease has an isoelectric point of 6.0, a pH optimum of 8.5, and is completely inhibited by serine protease inhibitors. A specificity study with small synthetic ester substrates indicated that the protease preferentially hydrolyzed bonds situated on the carboxyl side of aromatic or apolar amino acid residues which are not β-branched, positively charged or of the D configuration. Peptidase substrates and others such as N-acetyl-L-tyrosine-ethyl ester were not hydrolyzed. The protease was stable over a broad range of pH (6.5–9.5 at 30 °C, 20 h), and was particularly thermostable (t1/2 = 110 min at 73 °C, pH 7.4) in the presence of Ca2+ (10 mM). Macromolecules and Ca2+ also provide protection against the significant autolysis which occurs at pure protease concentrations greater than 0.01 mg/ml, as well as against surface denaturation which is enhanced by the presence of a silicone antifoam agent. Hence the stability of protease in submerged cultures is rationalized.

scholarly journals Purification and Biochemical Characterization of Alkaline Serine Protease from Caesalpinia bonducella

2010 ◽  
Vol 5 (6) ◽  
pp. 1934578X1000500
Author(s):  
Hidayatullah Khan ◽  
Irshad Ali ◽  
Arif-ullah Khan ◽  
Mushtaq Ahmed ◽  
Zamarud Shah ◽  
...  
Keyword(s):  
Serine Protease ◽  
Biochemical Characterization ◽  
Specific Activity ◽  
Sodium Dodecyl ◽  
Exchange Chromatography ◽  
Size Exclusion ◽  
Alkaline Serine Protease ◽  
Protease Enzyme ◽  
Caesalpinia Bonducella

A high molecular weight serine protease has been purified to electrophoretic homogeneity from the seeds of Caesalpinia bonducella Flem. (Caesalpiniaceae) by the combination of size exclusion and ion exchange chromatography. About 524 fold purification was achieved with an overall recovery of 6.8%. The specific activity was found to be 86 U/mg/min at pH 8.0. The calculated Km and Vmax were 1.66 mg/mL and 496.68 units/min per mg of protein, respectively. The molecular mass was estimated to be about 63 kDa by sodium dodecyl sulfate PAGE. The enzyme showed optimum activity at pH 8.0 and exhibited its highest activity at 40°C. The enzyme was strongly inhibited by 2mM phenylmethylsulfonyl fluoride (PMSF), suggesting the presence of a serine residue at the active site. PMSF showed a pure competitive type of inhibition with the serine protease enzyme. It was observed that enzyme activity was enhanced in the presence of dications and was active against a variety of modified substrates and natural proteins.

Sign in / Sign up

Export Citation Format

Share Document