Molecular dynamics analysis of a buckyball-antibody complex.
This is a multinanosecond molecular dynamics study of a bio-nano complex formed by a carbon nanoparticle, a buckyball C(60), and a biological molecule, an antibody, with high binding affinity and specificity. In the simulation, the ball is completely desolvated by the binding site of the antibody by means of a nearly perfect shape complementarity and extensive side-chain interactions, with the exception that about 17% of the surface is persistently exposed to solvent and could be used for functional derivatization. The interactions are predominantly hydrophobic, but significant polar interactions occur as well. There exists a rich body of various pi-stacking interactions. Aromatic side chains are involved in both double and triple stackings with the ball. Some ionic side chains, such as the guanidinium group of arginine, also form pi-stackings with the ball. The results suggest that pi-stackings are very efficient and common modes of biological recognition of pi-electron-rich carbon nanoparticles. Most importantly, the results demonstrate that, in general, an ordinary protein binding site, such as that of an antibody, can readily bind to a carbon nanoparticle with high affinity and specificity through recognition modes that are common in protein-ligand recognition.
Noon
William H
WH
Department of Bioengineering, Rice University, 6100 Main, MS-142, Houston, TX 77005, USA.
Kong
Yifei
Y
Ma
Jianpeng
J
D000906:Antibodies / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry* / Q000276:immunology; D003198:Computer Simulation; D008958:Models, Molecular; D036103:Nanotechnology; D017434:Protein Structure, Tertiary
D000906:Antibodies; D002244:Carbon