Microbial ?-amylases: physico-chemical properties, substrate specificity and domain structure

Avdiyuk, K.V.; Varbanets, L.D.

doi:10.15407/ubj85.04.005

Cited by 1 publication

(1 citation statement)

References 57 publications

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“…Substrate specificity of α -amylase varies with the source of microorganism [ 39 ]. In Figure 7 , Amy175 displayed the highest specificity towards amylose (131.4%), which is a linear glucose polymer connected by α -1,4 glycosidic bonds, followed by soluble starch (100%), while amylopectin (78.7%) and glycogen (29.7%) had much lower rate of hydrolysis due to more branches connected by α -1,6 glycosidic bonds in them.…”

Section: Resultsmentioning

confidence: 99%

Molecular Cloning and Characterization of a Novelα-Amylase from Antarctic Sea Ice BacteriumPseudoalteromonassp. M175 and Its Primary Application in Detergent

Wang

Kan

Ren

et al. 2018

BioMed Research International

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A novel cold-adapted and salt-tolerant α-amylase gene (amy175) from Antarctic sea ice bacterium Pseudoalteromonas sp. M175 was successfully cloned and expressed. The open reading frame (ORF) of amy175 had 1722 bp encoding a protein of 573 amino acids residues. Multiple alignments indicated Amy175 had seven highly conserved sequences and the putative catalytic triad (Asp244, Glu286, and Asp372). It was the first identified member of GH13_36 subfamily which contained QPDLN in the CSR V. The recombinant enzyme (Amy175) was purified to homogeneity with a molecular mass of about 62 kDa on SDS-PAGE. It had a mixed enzyme specificity of α-amylase and α-glucosidase. Amy175 displayed highest activity at pH 8.0 and 25°C and exhibited extreme salt-resistance with the maximum activity at 1 M NaCl. Amy175 was strongly stimulated by Mg2+, Ni2+, K+, 1 mM Ca2+, 1 mM Ba2+, 1 mM Pb2+, 1 mM sodium dodecyl sulphate (SDS), and 10% dimethyl sulfoxide (DMSO) but was significantly inhibited by Cu2+, Mn2+, Hg2+, 10 mM β-mercaptoethanol (β-ME), and 10% Tween 80. Amy175 demonstrated excellent resistance towards all the tested commercial detergents, and wash performance analysis displayed that the addition of Amy175 improved the stain removal efficiency. This study demonstrated that Amy175 would be proposed as a novel α-amylase source for industrial application in the future.

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Section: Resultsmentioning

confidence: 99%