Labeling Preferences of Diazirines with Protein Biomolecules
作者:Alexander V. West、Giovanni Muncipinto、Hung-Yi Wu、Andrew C. Huang、Matthew T. Labenski、Lyn H. Jones、Christina M. Woo
DOI:10.1021/jacs.1c02509
日期:2021.5.5
find that alkyl diazirines exhibit preferential labeling of acidic amino acids in a pH-dependent manner that is characteristic of a reactive alkyl diazo intermediate, while the aryl-fluorodiazirine labeling pattern reflects reaction primarily through a carbene intermediate. From a survey of 32 alkyl diazirine probes, we use this reactivity profile to rationalize why alkyl diazirine probes preferentially
Specific acid catalysis of p-sulfonatocalix[n]arenes (n = 4, Calix-S4; n = 6, Calix-S6; n = 8, Calix-S8) was observed in the alcoholysis of N-acetyl-l-amino acids in methanol. The methanolysis rates of basic amino acid substrates (His, Lys, and Arg) were markedly enhanced in the presence of Calix-Sn, as compared with rates observed with p-hydroxybenzenesulfonic acid (pHBS), which is a noncyclic analogue
在N-乙酰基-1-氨基酸的醇解反应中观察到了对磺酸磺基杯[n]芳烃的特定酸催化作用(n = 4,Calix-S4; n = 6,Calix-S6; n = 8,Calix-S8)。在甲醇中。与Calix-Sn的非环状类似物对羟基苯磺酸(pHBS)相比,在Calix-Sn的存在下,碱性氨基酸底物(His,Lys和Arg)的甲醇分解速率显着提高。 。在Phe,Tyr和Trp底物的甲醇分解中未观察到Calix-Sn的这种催化作用。另一方面,在Calix-Sn对CD(3)OD中N-乙酰基-1-氨基酸底物的影响之后的(1)H NMR实验表明,His底物与Calix-Sn的混合物的光谱为与各个化合物的组合光谱显着不同。光谱的这些变化支持了Calix-Sn与碱性氨基酸的包合物的形成。此外,很明显,由Calix-S4和Calix-S6催化的His底物的甲醇分解服从了Michaelis-Menten动力学。
ANTI-ODOR COMPOSITIONS AND THERAPEUTIC USE
申请人:Yu J. Ruey
公开号:US20060251597A1
公开(公告)日:2006-11-09
This application discloses a composition comprising a malodor compound and an anti-odor ingredient effective for reducing the presence or production of malodor. The composition may be topically applied to a subject and is useful for cosmetic conditions, pharmaceutical indications, or other objectives.