Synthesis of 5-, 6- and 7-substituted-2-aminoquinolines as SH3 domain ligands.
The Src homology 3 (SH3) domains are small protein-protein interaction domains that mediate a range of important biological processes and are considered valuable targets for the development of therapeutic agents. We have been developing 2-aminoquinolines as ligands for SH3 domains--so far the only reported examples of entirely small-molecule ligands for the SH3 domains. The highest affinity 2-aminoquinolines so far identified are 6-substituted compounds. In this article, the synthesis of several new 2-aminoquinolines, including 5-, 6- and 7-substituted compounds, for Tec SH3 domain ligand binding studies is presented. As a part of the synthetic investigation, the utility of different methods for the synthesis of 2-aminoquinolines was explored and potentially powerful methods were identified for the synthesis of 2-aminoquinolines with diverse functionality. Of the compounds prepared, the 5-substituted-2-aminoquinolines generally bound with similar affinities to unsubstituted 2-aminoquinoline, whilst the 7-substituted compounds generally bound with similar or lower affinity than unsubstituted 2-aminoquinoline. However, the 6-substituted-2-aminoquinolines generally bound with significantly higher affinity than unsubstituted 2-aminoquinoline. In addition, one 6-substituted-N-benzylated-2-aminoquinoline was also tested for SH3 binding and some evidence for the formation of additional contacts at other regions of the SH3 domain was found. These results provide new and useful SAR information that should greatly assist with the challenge of developing high affinity small-molecule ligands for the SH3 domains.
Inglis
Steven
S
Discipline of Chemistry, School of Chemistry and Physics, The University of Adelaide, Adelaide, SA 5005, Australia.
Jones
Rhiannon
R
Fritz
Daniel
D
Stojkoski
Cvetan
C
Booker
Grant
G
Pyke
Simon
S
D000634:Aminoquinolines / Q000138:chemical synthesis* / Q000737:chemistry* / Q000378:metabolism; D001665:Binding Sites; D008024:Ligands; D008954:Models, Biological; D015394:Molecular Structure; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D018909:src Homology Domains
D000634:Aminoquinolines; D008024:Ligands; C089848:Tec protein-tyrosine kinase; D011505:Protein-Tyrosine Kinases