α-Chymotrypsin-catalysed segment condensations via the kinetically controlled approach using carbamoylmethyl esters as acyl donors in organic mediaElectronic supplementary information (ESI) available: elemental analyses and HPLC separation data. See http://www.rsc.org/suppdata/p1/b1/b108738j/
New methods and reagents in organic synthesis, 29, A practical method for the preparation of optically acive N-protected .ALPHA.-amino aldehydes and peptide aldehydes.
作者:Yasumasa Hamada、Takayuki Shioiri
DOI:10.1248/cpb.30.1921
日期:——
Highly optically active N-protected α-amino aldehydes and peptide aldehydes can be conveniently prepared from the corresponding β-amino alcohols with little or no racemization by the use of a combination of sulfur trioxide-pyridine complex and dimethyl-sulfoxide in the presence of triethylamine.
Peptide couplings have been catalyzed in organic medium containing a slight amount of water (<0,5%) by PEG modified α-Chymotrypsin.
肽偶联已通过PEG修饰的α-胰凝乳蛋白酶在含有少量水(<0.5%)的有机介质中催化。
Methionine.sup.5 -enkephalin sulfoxides and sulfones
申请人:G. D. Searle & Co.
公开号:US04144228A1
公开(公告)日:1979-03-13
Methionine.sup.5 -enkephalin sulfoxides and sulfones having agonist activity at opiate receptors are disclosed herein. These sulfoxides and sulfones are useful as analgesics, non-addicting narcotic antagonists and anti-diarrheal agents.
Modification of the enkephalin "message" with an artificial polycationic C-terminus
作者:Alan R. Jacobson、S. William Tam、Lawrence M. Sayre
DOI:10.1021/jm00113a020
日期:1991.9
The C-terminal ''address'' sequences of prodynorphin-drived opioid peptides contain an unusually high proportion of basic residues, which are known to be crucial for conferring high activity and selectivity for kappa-opioid receptors. In an effort to investigate the possibility that the polycationic ''tails'' may be involved in a coulombic interaction with a complementary polyanionic receptor domain, we attached a series of achiral peptide-like cationic fragments to the C-terminus of the opioid peptide ''message'', Tyr-Gly-Gly-Phe. Binding of the various compounds to opioid receptor types in guinea pig brain membranes was weak, and the pharmacologic activities in the guinea pig ileum were marginal. These results indicate either that the chosen ligand design does not satisfy the structural requirements of the hypothesized coulombic interaction or that the latter is a minor criterion governing receptor recognition.