An improved and very simple procedure for thiazolinone conversion to thiohydantoin derivatives and their separation by reverse-phase high-pressure liquid chromatography is described. Trifluoroacetic acid (10%) in ethyl acetate has been employed as a conversion reagent to circumvent the deamidation of acid amides and methylation of acidic amino acids, with a concomitant increase in the detection limits of these residues. Additionally, a very simple procedure has been developed for the separation of phenylthiohydantoin (PTH) derivatives of amino acids. The system takes advantage of the computer-controlled precise mixing of the solvents A and B to achieve accurate pH and thus avoid the necessity of pH adjustment of a buffer. The procedure is simple and highly reproducible, and separates all the 20 known PTH amino acids. The efficiency of the method has been examined on synthetic and natural proteins/peptides, in manual and autoconversion systems, over a period of more than 18 months.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0003-2697(85)90535-4 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A Model of Zymogen Factor XII: Insights into Protease Activation.
Blood Adv
January 2025
Vanderbilt University Medical Center, Nashville, Tennessee, United States.
In plasma, the zymogens factor XII (FXII) and prekallikrein reciprocally convert each other to the proteases FXIIa and plasma kallikrein (PKa). PKa cleaves high-molecular-weight kininogen (HK) to release bradykinin, which contributes to regulation of blood vessel tone and permeability. Plasma FXII is normally in a "closed" conformation that limits activation by PKa.
View Article and Find Full Text PDFComputational analysis of the effect of a binding protein (RbpA) on the dynamics of Mycobacterium tuberculosis RNA polymerase assembly.
PLoS One
January 2025
Molecular Biophysics Unit, Indian Institute of Science, Bengaluru, Karnataka, India.
Article Synopsis
- RbpA is a critical protein for Mycobacterium tuberculosis growth, impacting transcription and antibiotic response, but its regulatory mechanisms are not fully understood.
- Significant structural changes in RNA polymerase occur when it interacts with RbpA, revealing important amino acids for transcription regulation and dynamic behavior of the complex.
- The study identifies potential ligands for RbpA's interaction site, laying the groundwork for future research on developing inhibitors that target RbpA's regulatory role in transcription.
An untargeted metabolomic analysis of acute AFB1 treatment in liver, breast, and lung cells.
PLoS One
January 2025
Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America.
Aflatoxin B1 (AFB1) is a class 1 carcinogen and mycotoxin known to contribute to the development of hepatocellular carcinoma (HCC), growth impairment, altered immune system modulation, and malnutrition. AFB1 is synthesized by Aspergillus flavus and is known to widely contaminate foodstuffs, particularly maize, wheat, and groundnuts. The mechanism in which AFB1 causes genetic mutations has been well studied, however its metabolomic effects remained largely unknown.
View Article and Find Full Text PDFAnalysis of glutamate-dependent mechanism and optimization of fermentation conditions for poly-gamma-glutamic acid production by Bacillus subtilis SCP017-03.
PLoS One
January 2025
College of life Sciences, Sichuan Normal University, Chengdu, Sichuan, China.
Poly-gamma-glutamic acid (γ-PGA) is mainly synthesized by glutamate-dependent strains in the manufacturing industry. Therefore, understanding glutamate-dependent mechanisms is imperative. In this study, we first systematically analyzed the response of Bacillus subtilis SCP017-03 to glutamate addition by comparing transcriptomics and proteomics.
View Article and Find Full Text PDFThe first complete hand-rearing of two neonatal finless porpoises.
PLoS One
January 2025
Laboratory of Veterinary Biochemistry, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan.
Hand-rearing of marine mammals is an essential technique for the husbandry of orphans in captivity or the wild, especially endangered cetacean species. The purpose of the present study was to establish a method for successful hand-rearing and evaluate the nutritional state of neonatal finless porpoises. Two neonate finless porpoises maternally neglected at 5 days of age (Day 5) (neonate A, animal A) and Day 4 (neonate B, animal B) were hand reared.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!