Cloning and heterologous expression of a hydrophobin gene Ltr. hyd from the tiger milk mushroom Lentinus tuber-regium in yeast-like cells of Tremella fuciformis
Electron. j. biotechnol
;
32: 6-12, Mar. 2018. tab, graf, ilus
Article
in English
| LILACS
| ID: biblio-1022493
ABSTRACT
Background:
Hydrophobins are small proteins secreted by filamentous fungi, which show a highly surface activity. Because of the signally self-assembling abilities and surface activities, hydrophobins were considered as candidates in many aspects, for example, stabilizing foams and emulsions in food products. Lentinus tuber-regium, known as tiger milk mushroom, is both an edible and medicinal sclerotium-producing mushroom. Up to now, the hydrophobins of L. tuber-regium have not been identified.Results:
In this paper, a Class I hydrophobin gene, Ltr.hyd, was cloned from L. tuber-regium and expressed in the yeast-like cells of Tremella fuciformis mediated by Agrobacterium tumefaciens. The expression vector pGEH-GH was under the control of T. fuciformis glyceraldehyde-3-phosphate dehydrogenase gene (gpd) promoter. The integration of Ltr.hyd into the genome of T. fuciformis was confirmed by PCR, Southern blot, fluorescence observation and quantitative real-time PCR (qRT-PCR). Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) demonstrated that recombinant hydrophobin rLtr.HYD with an expected molecular mass of 13 kDa was extracted. The yield of rLtr.HYD was 0.66 mg/g dry weight. The emulsifying activity of rLtr.HYD was better than the typical food emulsifiers sodium caseinate and Tween 20.Conclusions:
We evaluated the emulsifying property of hydrophobin Ltr.HYD, which can be potentially used as a food emulsifier.
Full text:
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Index:
LILACS (Americas)
Main subject:
Basidiomycota
/
Fungal Proteins
/
Lentinula
Language:
English
Journal:
Electron. j. biotechnol
Journal subject:
Biotechnology
Year:
2018
Type:
Article
/
Project document
Affiliation country:
China
Institution/Affiliation country:
Huazhong Agricultural University/CN
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