Assessment of reagents for selenocysteine conjugation and the stability of selenocysteine adducts
作者:Lee Pedzisa、Xiuling Li、Christoph Rader、William R. Roush
DOI:10.1039/c6ob00775a
日期:——
circulatory stability, which can result in premature drug release with consequent off-target toxicities. Selenocysteine-modified antibodies have been developed that allow site-specific antibody conjugation, yielding homogeneous ADCs. Herein, we survey several electrophilic functional groups that react with selenocystine with high efficiency. Several of these result in conjugates with stabilities that are
Rapid, Stable, Chemoselective Labeling of Thiols with Julia-Kocieński-like Reagents: A Serum-Stable Alternative to Maleimide-Based Protein Conjugation
作者:Narihiro Toda、Shigehiro Asano、Carlos F. Barbas
DOI:10.1002/anie.201306241
日期:2013.11.25
Exquisite chemoselectivity for cysteine has been found for methylsulfonylphenyloxadiazole compounds under various buffer conditions. Furthermore, the resulting protein conjugates have superior stability to cysteine–maleimide conjugates in human plasma (HSA=human serum albumin, MBP‐C‐HA=maltose‐binding protein). This new thiol‐click reaction offers a new approach to generate stable protein conjugates
Stable and Rapid Thiol Bioconjugation by Light-Triggered Thiomaleimide Ring Hydrolysis
作者:Dimpy Kalia、Sharad P. Pawar、Jyoti S. Thopate
DOI:10.1002/anie.201609733
日期:2017.2.6
Maleimide‐mediated thiol‐specific derivatization of biomolecules is one of the most efficacious bioconjugation approaches currently available. Alarmingly, however, recent work demonstrates that the resulting thiomaleimide conjugates are susceptible to breakdown via thiol exchange reactions. Herein, we report a new class of maleimides, namely o‐CH2NHiPr phenyl maleimides, that undergo unprecedentedly
Chemical Modification of Lipase for Rational Enhancement of Enantioselectivity
作者:Tadashi Ema、Hiroki Inoue
DOI:10.1246/cl.150667
日期:2015.10.5
Chemical modifications of the I287C mutant of a Burkholderia cepacia lipase afforded various I287C-X conjugates, among which I287C-PAA bearing an N-phenylacetamide (PAA) moiety showed excellent enantioselectivity and catalytic activity for secondary alcohols. Site-directed chemical modifications are powerful tools to control enantioselective biocatalysis.
Intramolecular Diels−Alder and Tandem Intramolecular Diels−Alder/1,3-Dipolar Cycloaddition Reactions of 1,3,4-Oxadiazoles
作者:Gordon D. Wilkie、Gregory I. Elliott、Brian S. J. Blagg、Scott E. Wolkenberg、Danielle R. Soenen、Michael M. Miller、Scott Pollack、Dale L. Boger
DOI:10.1021/ja027533n
日期:2002.9.1
The scope of intramolecularDiels-Alder and a novel tandem Diels-Alder/1,3-dipolar cycloaddition cascade of 1,3,4-oxadiazoles is disclosed. In the cases examined, the tandem cycloadditions construct three new rings with formation of four new C-C bonds and set all six stereocenters about a central six-membered ring in a single step including three contiguous and four total quaternary centers without
公开了分子内 Diels-Alder 和 1,3,4-恶二唑的新型串联 Diels-Alder/1,3-偶极环加成级联的范围。在所研究的案例中,串联环加成构建了三个新环,形成了四个新的 CC 键,并在一个步骤中将所有六个立体中心设置在一个中央六元环上,包括三个连续的和四个总的四元中心,没有第二个非对映体的痕迹.