tetano
Editor, Senior Moderator
J Am Chem Soc. 2019 Jun 11. doi: 10.1021/jacs.9b02196. [Epub ahead of print]
[h=1]X-ray crystal structure of the influenza A M2 proton channel S31N mutant in two conformational states: an open and shut case.[/h] Thomaston JL, Wu Y, Polizzi N, Liu L, Wang J, DeGrado WF.
[h=3]Abstract[/h] The amantadine-resistant S31N mutant of the influenza A M2 proton channel has become prevalent in currently circulating viruses. Here we have solved an X-ray crystal structure of M2(22-46) S31N that contains two distinct conformational states within its asymmetric unit. This structure reveals the mechanism of adamantane resistance in both conformational states of the M2 channel. In the Inward(open) conformation, the mutant Asn31 side chain faces the channel pore and sterically blocks the adamantane binding site. In the Inward(closed) conformation, Asn31 forms hydrogen bonds with carbonyls at the monomer-monomer interface, which twists the monomer helices and constricts the channel pore at the drug binding site. We also examine M2(19-49) WT and S31N using solution NMR spectroscopy, and show that distribution of the two conformational states is dependent on both detergent choice and experimental pH.
PMID: 31184871 DOI: 10.1021/jacs.9b02196
[h=1]X-ray crystal structure of the influenza A M2 proton channel S31N mutant in two conformational states: an open and shut case.[/h] Thomaston JL, Wu Y, Polizzi N, Liu L, Wang J, DeGrado WF.
[h=3]Abstract[/h] The amantadine-resistant S31N mutant of the influenza A M2 proton channel has become prevalent in currently circulating viruses. Here we have solved an X-ray crystal structure of M2(22-46) S31N that contains two distinct conformational states within its asymmetric unit. This structure reveals the mechanism of adamantane resistance in both conformational states of the M2 channel. In the Inward(open) conformation, the mutant Asn31 side chain faces the channel pore and sterically blocks the adamantane binding site. In the Inward(closed) conformation, Asn31 forms hydrogen bonds with carbonyls at the monomer-monomer interface, which twists the monomer helices and constricts the channel pore at the drug binding site. We also examine M2(19-49) WT and S31N using solution NMR spectroscopy, and show that distribution of the two conformational states is dependent on both detergent choice and experimental pH.
PMID: 31184871 DOI: 10.1021/jacs.9b02196