Oxidation of Free Tryptophan and Tryptophan Residues in Peptides and Proteins

1998 ◽  
Vol 46 (2) ◽  
pp. 490-498 ◽  
Author(s):  
T. J. Simat ◽  
H. Steinhart
Keyword(s):  
Free Tryptophan ◽  
Tryptophan Residues

Enzymatic derivatizations of tryptophan residues in peptides and proteins, free tryptophan, and its metabolites with tryptophan side chain oxidase types I and II from Pseudomonas

Amino Acids ◽  
1990 ◽  
pp. 1059-1066
Author(s):  
Eiko Nakamaru ◽  
Takaaki Kawashima ◽  
Yoshiki Kamiyama ◽  
Hidefumi Yoshii ◽  
Akira Kanda ◽  
...  
Keyword(s):  
Side Chain ◽  
Free Tryptophan ◽  
Tryptophan Residues

Direct Photometric Determination of Globulin in Serum

1971 ◽  
Vol 17 (5) ◽  
pp. 358-362 ◽  
Author(s):  
Harry Goldenberg ◽  
Patricia A Drewes
Keyword(s):  
Glyoxylic Acid ◽  
Photometric Determination ◽  
Confidence Limits ◽  
Serum Globulin ◽  
Clin Pathol ◽  
Free Tryptophan ◽  
Tryptophan Residues ◽  
Fractionation Method ◽  
Salt Fractionation

Abstract A convenient method for direct photometric determination of total globulin in serum has been developed using a one-tube, one-reagent system. The analysis is based on a variation of the Hopkins-Cole reaction, in which glyoxylic acid condenses with the tryptophan residues present in globulin to produce a purple color. In the presence of copper and under the conditions of the analysis, color intensity is proportional to serum globulin concentration. The method is standardized with either a serum control or a suitable tryptophan derivative (e.g., acetyl-DL-tryptophan). There is little or no interference from free tryptophan, albumin, bilirubin, lipemia, or mild hemolysis. The precision of the method is ±3% (95% confidence limits), and results agree with those obtained by the salt fractionation method of Wolfson et al. [Amer. J. Clin. Pathol. 18, 723 (1948)]: t = -0.88; critical t = 2.02; 95% confidence limits.

scholarly journals Formation of N′-formylkynurenine in proteins from lens and other sources by exposure to sunlight

1971 ◽  
Vol 125 (1) ◽  
pp. 203-208 ◽  
Author(s):  
Antoinette Pirie
Keyword(s):  
Indole Ring ◽  
Lens Proteins ◽  
Free Tryptophan ◽  
Tryptophan Residues ◽  
Oxidative Change ◽  
Oxidative Effect

The photo-oxidative effect of sunlight on the tryptophan residues of proteins and on free tryptophan is described. Evidence is presented that the indole ring is split to yield N′-formylkynurenine. The possible relation of this photo-oxidative change to changes in the lens proteins of brown cataracts is discussed.

Free tryptophan residues inhibit quorum sensing of Pseudomonas aeruginosa: a potential approach to inhibit the development of microbial biofilm

2018 ◽  
Vol 200 (10) ◽  
pp. 1419-1425 ◽  
Author(s):  
Poulomi Chakraborty ◽  
Akshay Vishnu Daware ◽  
Monika Kumari ◽  
Ahana Chatterjee ◽  
Disha Bhattacharyya ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Quorum Sensing ◽  
Microbial Biofilm ◽  
Potential Approach ◽  
Free Tryptophan ◽  
Tryptophan Residues
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