scholarly journals Alteration of the Substrate Specificity of the Angular Dioxygenase Carbazole 1,9a-Dioxygenase

2008 ◽  
Vol 72 (12) ◽  
pp. 3237-3248 ◽  
Author(s):  
Hiromasa UCHIMURA ◽  
Tadafumi HORISAKI ◽  
Takashi UMEDA ◽  
Haruko NOGUCHI ◽  
Yusuke USAMI ◽  
...  
Keyword(s):  
Substrate Specificity ◽  
Angular Dioxygenase

Substrate specificity and inducibility of TACE (tumour necrosis factor α-converting enzyme) revisited: the Ala-Val preference, and induced intrinsic activity

2003 ◽  
Vol 70 ◽  
pp. 39-52 ◽  
Author(s):  
Roy A. Black ◽  
John R. Doedens ◽  
Rajeev Mahimkar ◽  
Richard Johnson ◽  
Lin Guo ◽  
...  
Keyword(s):  
Substrate Specificity ◽  
Recent Work ◽  
Tumour Necrosis Factor ◽  
Tumour Necrosis ◽  
Transforming Growth Factor ◽  
Intrinsic Activity ◽  
Converting Enzyme ◽  
Tumour Necrosis Factor Α ◽  
Factor Α ◽  
Necrosis Factor

Tumour necrosis factor α (TNFα)-converting enzyme (TACE/ADAM-17, where ADAM stands for a disintegrin and metalloproteinase) releases from the cell surface the extracellular domains of TNF and several other proteins. Previous studies have found that, while purified TACE preferentially cleaves peptides representing the processing sites in TNF and transforming growth factor α, the cellular enzyme nonetheless also sheds proteins with divergent cleavage sites very efficiently. More recent work, identifying the cleavage site in the p75 TNF receptor, quantifying the susceptibility of additional peptides to cleavage by TACE and identifying additional protein substrates, underlines the complexity of TACE-substrate interactions. In addition to substrate specificity, the mechanism underlying the increased rate of shedding caused by agents that activate cells remains poorly understood. Recent work in this area, utilizing a peptide substrate as a probe for cellular TACE activity, indicates that the intrinsic activity of the enzyme is somehow increased.

Substrate Specificity of Leukocyte and Platelet Elastases

1978 ◽  
Vol 39 (03) ◽  
pp. 785-786 ◽  
Author(s):  
Y Legrand ◽  
J Caen ◽  
L Robert
Keyword(s):  
Substrate Specificity

PRKACA mutations in adrenal Cushing can alter substrate specificity

2017 ◽  
Author(s):  
Kerstin Bathon ◽  
Isabel Weigand ◽  
Jens T Vanselow ◽  
Cristina L Ronchi ◽  
Dalmazi Guido Di ◽  
...  
Keyword(s):  
Substrate Specificity

Human Neuraminidases Have Reduced Activity Towards Modified Sialic Acids on Glycoproteins

2020 ◽  
Author(s):  
Carmanah D. Hunter ◽  
Elizabeth Porter ◽  
Christopher Cairo
Keyword(s):  
Substrate Specificity ◽  
General Trend ◽  
Sialic Acids ◽  
Enzyme Specificity ◽  
Naturally Occurring ◽  
Bovine Submaxillary Mucin ◽  
Reduced Activity

This work investigated the substrate specificity of hNEU enzymes for a glycoprotein substrate (bovine submaxillary mucin) containing 9-<i>O</i>-acetylated and Neu5Gc residues. Using this model substrate, we observe a general trend for hNEU tolerance of Neu5Ac>Neu5Gc>>>Neu5,9Ac<sub>2</sub>, consistent with our previous results with glycolipid substrates. These results expand our understanding of hNEU enzyme specificity and suggest that naturally occurring modifications of sialic acids can play a role in regulating hNEU activity.

Bioinformatics-Guided Discovery of Citrulline 4-Hydroxylase from GE81112 Biosynthesis and Rational Engineering of Its Substrate Specificity

2019 ◽  
Author(s):  
Christian Zwick ◽  
Max Sosa ◽  
Hans Renata
Keyword(s):  
Substrate Specificity ◽  
Guided Discovery ◽  
Rational Engineering

We functionally characterize a nonheme dioxygenase from GE81112 biosynthesis and identify it as a citrulline hydroxylase. A bioinformatics guided engineering was performed to alter the substrate specificity of the enzyme.

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