scholarly journals Characterization of novel cathepsin K mutations in the pro and mature polypeptide regions causing pycnodysostosis

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pp. 731-738 ◽  
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Wu-Shiun Hou ◽  
Dieter Brömme ◽  
Yingming Zhao ◽  
Ernest Mehler ◽  
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pp. 1601-1606 ◽  
Author(s):  
S. Sun ◽  
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Keyword(s):  

PLoS ONE ◽  
2017 ◽  
Vol 12 (10) ◽  
pp. e0186869 ◽  
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Preety Panwar ◽  
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2018 ◽  
Vol 16 (1) ◽  
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Erik Lindström ◽  
Biljana Rizoska ◽  
Ian Henderson ◽  
Ylva Terelius ◽  
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Bone ◽  
2012 ◽  
Vol 50 ◽  
pp. S164-S165 ◽  
Author(s):  
U. Grabowska⁎ ◽  
I. Henderson ◽  
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L. Vrang ◽  
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Konstadinos Moissoglu ◽  
Jian Zhang ◽  
John A. Martignetti ◽  
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pp. 1065-1073 ◽  
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Dolores Linde ◽  
Isabel Macias ◽  
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Antonio Jim�nez ◽  
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ABSTRACT An extracellular β-fructofuranosidase from the yeast Xanthophyllomyces dendrorhous was characterized biochemically, molecularly, and phylogenetically. This enzyme is a glycoprotein with an estimated molecular mass of 160 kDa, of which the N-linked carbohydrate accounts for 60% of the total mass. It displays optimum activity at pH 5.0 to 6.5, and its thermophilicity (with maximum activity at 65 to 70�C) and thermostability (with a T 50 in the range 66 to 71�C) is higher than that exhibited by most yeast invertases. The enzyme was able to hydrolyze fructosyl-β-(2→1)-linked carbohydrates such as sucrose, 1-kestose, or nystose, although its catalytic efficiency, defined by the k cat/Km ratio, indicates that it hydrolyzes sucrose approximately 4.2 times more efficiently than 1-kestose. Unlike other microbial β-fructofuranosidases, the enzyme from X. dendrorhous produces neokestose as the main transglycosylation product, a potentially novel bifidogenic trisaccharide. Using a 41% (wt/vol) sucrose solution, the maximum fructooligosaccharide concentration reached was 65.9 g liter−1. In addition, we isolated and sequenced the X. dendrorhous β-fructofuranosidase gene (Xd-INV), showing that it encodes a putative mature polypeptide of 595 amino acids and that it shares significant identity with other fungal, yeast, and plant β-fructofuranosidases, all members of family 32 of the glycosyl-hydrolases. We demonstrate that the Xd-INV could functionally complement the suc2 mutation of Saccharomyces cerevisiae and, finally, a structural model of the new enzyme based on the homologous invertase from Arabidopsis thaliana has also been obtained.


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