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Satoshi Takeda Yoshiaki Kono Yukihiko Kameda 《Entomologia Experimentalis et Applicata》1988,46(3):291-294
The effect of validoxylamine A (VAA), a potent and specific trehalase inhibitor, on the induction of non-diapause in Bombyx mori was examined. The VAA induced non-diapause eggs and prevented the glucogen accumulation in the eggs. Trehalase activity of the pupal ovary was effectively inhibited by the VAA injection. 相似文献
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Eva Macakova Miroslava Kopecka Zdenek Kukacka Dana Veisova Petr Novak Petr Man Tomas Obsil Veronika Obsilova 《Biochimica et Biophysica Acta (BBA)/General Subjects》2013
Background
Trehalases are highly conserved enzymes catalyzing the hydrolysis of trehalose in a wide range of organisms. The activity of yeast neutral trehalase Nth1 is regulated in a 14-3-3- and a calcium-dependent manner. The Bmh proteins (the yeast 14-3-3 isoforms) recognize phosphorylated Nth1 and enhance its enzymatic activity through an unknown mechanism.Methods
To investigate the structural basis of interaction between Nth1 and Bmh1, we used hydrogen/deuterium exchange coupled to mass spectrometry, circular dichroism spectroscopy and homology modeling to identify structural changes occurring upon the complex formation.Results
Our results show that the Bmh1 protein binding affects structural properties of several regions of phosphorylated Nth1: the N-terminal segment containing phosphorylation sites responsible for Nth1 binding to Bmh, the region containing the calcium binding domain, and segments surrounding the active site of the catalytic trehalase domain. The complex formation between Bmh1 and phosphorylated Nth1, however, is not accompanied by the change in the secondary structure composition but rather the change in the tertiary structure.Conclusions
The 14-3-3 protein-dependent activation of Nth1 is based on the structural change of both the calcium binding domain and the catalytic trehalase domain. These changes likely increase the accessibility of the active site, thus resulting in Nth1 activation.General significance
The results presented here provide a structural view of the 14-3-3 protein-dependent activation of yeast neutral trehalase Nth1, which might be relevant to understand the process of Nth1 activity regulation as well as the role of the 14-3-3 proteins in the regulation of other enzymes. 相似文献
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