Happy New Year 2013
C&EN did a brief piece "revisiting 2002" and took a look at in situ click chemistry. Some key points:
Original publication by Scripps Group in Angew Chem Int 2002, 1053
Acetylcholinesterase directs the synthesis of its own potent inhibitor when induced-and-fit
Difficulties: large quantity of protein, little quantity of inhibitor, slow reaction, etc
Ten years have seem a few successes but limited adoption
Copper catalyzed version (CuAAC) enjoyed widespread popularity
Original publication by the Group in Angew Chem Int 2002, 2596
Forget Not the Key ----
Fast "molecular discovery" for functions
Showing posts with label in situ click chemistry. Show all posts
Showing posts with label in situ click chemistry. Show all posts
Tuesday, January 1, 2013
Sunday, May 20, 2012
Antibody-type compounds by iterative in situ click chemistry
Angew. Chem. Int. Ed. 2009, 48, (27) 4944
The work by Heath, Fokin, Sharpless et al is summarized in the above graph. To make a few points:
1. For protein binding, Phage-display peptide aptamers are not as popular as DNA aptamers
2. OBOC (one-bead-one-compound) allows for identity tracking in combinatorial chemistry and ligand selection
3. Multi-valency or multi-dentate ligands provide superior and amazing binding power than the individual components. Remember EDTA?
4. Protein binding agents, particularly surface binding ones, almost certainly adopt multiple interactions with the target protein, offering superior binding affinity and / or specificity.
5. Triazole linkage in a peptide may present itself much like an amino acid, in terms of size and hydrogen bonding capacity.
6. The above strategy quickly selected nM affinity in third round, from 500uM in first round.
7. This iterative strategy effectively "expanded" the size of the library (~0.1 million sequences)
8. In situ click chemistry is guided by the surface binding, pulling alkyne and azide into position for reaction for the realization of fragment-based assembly of high-affinity protein binders.
9. The resulting ligands are water-soluble and stable chemically, biochemically, and thermally.
10. Gram-scale synthesis of the selected sequence is straight-forward using CuAAC.
11. The binding is off-site (non-active site binding), on surface, and highly selective, the general feature of natural antibody.
The work by Heath, Fokin, Sharpless et al is summarized in the above graph. To make a few points:
1. For protein binding, Phage-display peptide aptamers are not as popular as DNA aptamers
2. OBOC (one-bead-one-compound) allows for identity tracking in combinatorial chemistry and ligand selection
3. Multi-valency or multi-dentate ligands provide superior and amazing binding power than the individual components. Remember EDTA?
4. Protein binding agents, particularly surface binding ones, almost certainly adopt multiple interactions with the target protein, offering superior binding affinity and / or specificity.
5. Triazole linkage in a peptide may present itself much like an amino acid, in terms of size and hydrogen bonding capacity.
6. The above strategy quickly selected nM affinity in third round, from 500uM in first round.
7. This iterative strategy effectively "expanded" the size of the library (~0.1 million sequences)
8. In situ click chemistry is guided by the surface binding, pulling alkyne and azide into position for reaction for the realization of fragment-based assembly of high-affinity protein binders.
9. The resulting ligands are water-soluble and stable chemically, biochemically, and thermally.
10. Gram-scale synthesis of the selected sequence is straight-forward using CuAAC.
11. The binding is off-site (non-active site binding), on surface, and highly selective, the general feature of natural antibody.
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