Phosphotyrosine-Containing Dipeptides as High-Affinity Ligands for the p56lck SH2 Domain
摘要:
Src homology-2 (SH2) domains are noncatalytic motifs containing approximately 100 amino acid residues that are involved in intracellular signal transduction. The phosphotyrosine-containing tetrapeptide Ac-pYEEI binds to the SH2 domain of p.56(lck) (Lck) with an affinity of 0.1 mu M. Starting from Ac-pYEEI, we have designed potent antagonists of the Lck SH2 domain which are reduced in peptidic character and in which the three carboxyl groups have been eliminated. The two C-terminal amino acids (EI) have been replaced by benzylamine derivatives and the pY + 1 glutamic acid has been substituted with leucine. The best C-terminal fragment identified, (S)-1-(4-isopropylphenyl)ethylamine, binds to the Lck SH2 domain better than the C-terminal dipeptide EI. Molecular modeling suggests that the substituents at the 4-position of the phenyl ring occupy the pY + 3 lipophilic pocket in the SH2 domain originally occupied by the isoleucine side chain. This new series of phosphotyrosine-containing dipeptides binds to the Lck SH2 domain with potencies comparable to that of tetrapeptide 1.
Phosphotyrosine-Containing Dipeptides as High-Affinity Ligands for the p56lck SH2 Domain
摘要:
Src homology-2 (SH2) domains are noncatalytic motifs containing approximately 100 amino acid residues that are involved in intracellular signal transduction. The phosphotyrosine-containing tetrapeptide Ac-pYEEI binds to the SH2 domain of p.56(lck) (Lck) with an affinity of 0.1 mu M. Starting from Ac-pYEEI, we have designed potent antagonists of the Lck SH2 domain which are reduced in peptidic character and in which the three carboxyl groups have been eliminated. The two C-terminal amino acids (EI) have been replaced by benzylamine derivatives and the pY + 1 glutamic acid has been substituted with leucine. The best C-terminal fragment identified, (S)-1-(4-isopropylphenyl)ethylamine, binds to the Lck SH2 domain better than the C-terminal dipeptide EI. Molecular modeling suggests that the substituents at the 4-position of the phenyl ring occupy the pY + 3 lipophilic pocket in the SH2 domain originally occupied by the isoleucine side chain. This new series of phosphotyrosine-containing dipeptides binds to the Lck SH2 domain with potencies comparable to that of tetrapeptide 1.
Chemoenzymatic synthesis of pure enantiomeric 2-aryl propionic acids.
作者:Mariano García、Carmen del Campo、Emilio F. lama、José M. Sánchez-Montero、José V. Sinisterra
DOI:10.1016/s0040-4020(01)81926-8
日期:1993.1
A new chemoenzymatic procedure to obtain pure enantiomeric 2-arylpropionic acids is described. The one pot synthesis of (±)-2-arylpropionic acids is carried out by addition of dichlorocarbene to the O bond of arylmethylketones and hydrogenolysis of the addition product. The racemic mixture is resolved by enantiospecific hydrolysis of the racemic ethyl esters using native lipase from Candida rugosa
Compounds co-inducing cholinergic up-regulation and inflammation down-regulation and uses thereof
申请人:Israel Institute for Biological Research
公开号:US20020160988A1
公开(公告)日:2002-10-31
Chimeric compounds are disclosed which are covalent conjugates of reversible or irreversible cholinergic up-regulators and non-steroidal anti-inflammatory drugs (NSAIDs), methods for their synthesis and use thereof for treatment and/or prevention of central nervous system (CNS) disorders and diseases.
Amphiphilic pyridinium compounds, method of making and use thereof
申请人:Pollard B. Harvey
公开号:US20070105916A1
公开(公告)日:2007-05-10
The present invention is directed to the amphiphilic pyridinium compounds, such as for suppressing IL-8 secretion and production. The present invention further provides methods of making and using such compounds for the treatment of the IL-8 related diseases, such as cystic fibrosis.