Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 31, Pages 34514-34523Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c05994
Keywords
specific interaction; alanine scanning mutagenesis; artificial protein; Goldbody; conformation engineering; antibody; gold nanoparticle
Funding
- Natural Science Foundation of China [31871007, 31771105, 31571024]
- National Key Research and Development Plan of China [2016YFA0201602]
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The interaction between nanoparticles and proteins is a central problem in the nano-bio-fields. However, it is still a great challenge to characterize the specific interaction between nanoparticles and proteins in structural details. Using the Goldbodies, the artificial antibodies created by grafting complementary-determining regions (CDRs) of natural antibodies onto gold nanoparticles, as the models, we manage to identify the key residues of the CDR peptides on gold nanoparticles for the specific interactions by alanine scanning mutagenesis. Each and every residue of the CDR peptides on two Goldbodies (which specifically bind with hen egg white lysozyme and epidermal growth factor receptor, respectively) is mutated to alanine one by one, generating a total of 18 single-mutants of the two Goldbodies. Experimental results reveal that the key residues of the CDR peptides for the specific interactions between the two Goldbodies and the corresponding antigens are exactly the same as those in the natural antibodies, thus proving that the correct conformations of the CDRs of natural antibodies have been successfully reconstructed on AuNPs. This is the first residue-resolution structural illustration for the specific interaction between a designed nanoparticle and a protein.
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