Isolation and characterization of a salt-tolerant γ-glutamyl transpeptidase from xerophilic Aspergillus sydowii
Isolation and characterization of a salt-tolerant γ-glutamyl transpeptidase from xerophilic Aspergillus sydowii
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耐旱的 sydowii 曲霉中耐盐 γ-谷氨酰转肽酶的分离和表征
DOI:
10.1007/s13205-022-03259-3
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发表时间:
2022
期刊:
影响因子:
2.8
通讯作者:
Takenaka Shinji
中科院分区:
文献类型:
--
作者:
Nishikawa Arisa;Senba Hironori;Kimura Yukihiro;Yokota Satoko;Doi Mikiharu;Takenaka Shinji
XerophilicAspergillusmolds isolated from halo-alkaliphilic and dry environments are attractive genetic resources for obtaining salt- and osmo-adaptive enzymes.A. sydowiiMA0196 secreted the largest amount of γ-glutamyl transpeptidase (GGT) during solid-state fermentation at a low initial water activity (aw= 0.85). Gel filtration analysis revealed that the molecular mass of the purified native enzyme (MA0196 GGT) was 120 kDa. SDS-PAGE analysis showed that MA0196 GGT consists of two subunits with molecular masses of 56.4 and 33 kDa, indicating production from a proenzyme via autoproteolysis. Deglycosylation of the subunits byN-glycosidase F yielded 40.9 and 19.6 kDa species. MA0196 GGT retained transpeptidase and hydrolysis activities and their catalytic efficiency (kcat/Km) under high salt and low water activity. The enzyme displayed broad substrate specificity toward γ-glutamyl acceptors such as amino acids and the imidazole dipeptides, carnosine and anserine. Carnosine and L-glutamine were converted into γ-glutamyl-β-alanyl-L-histidine by MA0196 GGT with a 32.9% yield in the presence of 2% (v/v) dimethyl sulfoxide. Phylogenetic analysis indicated that MA0196 GGT forms a distinct lineage fromA. oryzaeandA. sojaeGGTs. These excellent properties indicate that MA0196 GGT can be used in salted fermentation and for producing bioactive peptides.
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影响因子:
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