The chemical reactivities offree His, Trp, and Tyr and of their acetylated derivatives, N-AcHis, N-AcTyr, and N-AcTrp, toward TCBP triplets are compared to reveal the influenceof amino group charge on the oxidation of aromatic amino acids. Thebimolecular rate constants of quenching reactions...
In all cases, the electrical charge of an amino acid in solution is determined by its isoelectric point and the pH of the medium. When the pH is higher than the isoelectric point, the amino acid will carry a negative charge due to the ionization of the carboxyl group. In contrast, when...
The presence of aprimary amino groupin the Chit macromolecule provides it with the properties of polyelectrolyte in an acidic medium. Macromolecules have a high charge density: one charge per glucose amine group. In this case, the effect of polyelectrolyte swelling is observed in an anomalous incre...
4h, i). We reason that the positive charge of the protonated C3’ dimethylamino group of desosamine in new position might better interact with the negative charges of the loop between F and G helices (Asp182-Asp183) and the A-B loop (Glu48-Gly49-Asp50-Glu51) in the 4-bound Pi...
Hence, they evolved to distinguish between these amino acids without editing mechanisms92 or the exploitation of the negative charge of glutamic acid93,94. The discrimination of glutamine and glutamic acid by GlnRS cannot be attributed entirely to the composition of the binding site; changing the ...
AminoAcidsasAcidsandBases •Ionizationofthe–NH2andthe–COOHgroup•Zwitterionhasbotha+and–charge•Zwitterionisneutraloverall+NH2–CH2–COOHglycineH3N–CH2–COO–Zwitterionofglycine 9 pHandionization H++ H3N–CH2–COOH+H3N–CH2–COO–H2N–CH2–COO–
The sequence of relative activities of the olefins CH=CHX is affected both by the polarising effect of the group X and the possibility of the delocalisation of the charges in the activated complex. Nevertheless the problems of the catalytic effect of proton-donating, alkaline, and particularly ...
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R2 and R3 are not the group of the formula: -L2-COOH at one and the same time, An- is an anionic dyestuff portion having an n-fold negative charge, Cat+ is a cationic radical, n is an integer, q is any of 0 and an integer, and when q is greater than 1 then each of the ...
1、Chapter : Amino Acids,15:27:32,1,TOPIC,Part: acidic and basic properties of amino acids,Part: dissociation of amino acids,Part : optical rotation of amino acids,15:27:32,2,ACIDIC AND BASIC PROPERTIESOFAMINO ACIDS,Part,15:27:32,3,Some R group in their side chains are ionizable . ...