Structure and mechanism of the influenza A M218–60 dimer of dimers
Identifieur interne : 000494 ( Main/Merge ); précédent : 000493; suivant : 000495Structure and mechanism of the influenza A M218–60 dimer of dimers
Auteurs : Loren B. Andreas [États-Unis] ; Marcel Reese [États-Unis] ; Matthew Eddy [États-Unis] ; Vladimir Gelev [Bulgarie] ; Qing Zhe Ni [États-Unis] ; Eric Miller [États-Unis] ; Lyndon Emsley [Suisse] ; Guido Pintacuda [France] ; James J. Chou [France] ; Robert G. Griffin [États-Unis]Source :
- Journal of the American Chemical Society [ 0002-7863 ] ; 2015.
Abstract
We report a magic angle spinning (MAS) NMR structure of the drug-resistant S31N mutation of M218–60 from Influenza A. The protein was dispersed in diphytanoyl-sn-glycero-3-phosphocholine lipid bilayers, and the spectra and an extensive set of constraints indicate that M218–60 consists of a dimer of dimers. In particular, ∼280 structural constraints were obtained using dipole recoupling experiments that yielded well-resolved 13C–15N, 13C–13C, and 1H–15N 2D, 3D, and 4D MAS spectra, all of which show cross-peak doubling. Interhelical distances were measured using mixed 15N/13C labeling and with deuterated protein, MAS at ωr/2π = 60 kHz, ω0H/2π = 1000 MHz, and 1H detection of methyl–methyl contacts. The experiments reveal a compact structure consisting of a tetramer composed of four transmembrane helices, in which two opposing helices are displaced and rotated in the direction of the membrane normal relative to a four-fold symmetric arrangement, yielding a two-fold symmetric structure. Side chain conformations of the important gating and pH-sensing residues W41 and H37 are found to differ markedly from four-fold symmetry. The rmsd of the structure is 0.7 Å for backbone heavy atoms and 1.1 Å for all heavy atoms. This two-fold symmetric structure is different from all of the previous structures of M2, many of which were determined in detergent and/or with shorter constructs that are not fully active. The structure has implications for the mechanism of H+ transport since the distance between His and Trp residues on different helices is found to be short. The structure also exhibits two-fold symmetry in the vicinity of the binding site of adamantyl inhibitors, and steric constraints may explain the mechanism of the drug-resistant S31N mutation.
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DOI: 10.1021/jacs.5b04802
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<author><name sortKey="Griffin, Robert G" sort="Griffin, Robert G" uniqKey="Griffin R" first="Robert G" last="Griffin">Robert G. Griffin</name>
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<idno type="DOI">10.1021/jacs.5b04802</idno>
<series><title level="j">Journal of the American Chemical Society</title>
<idno type="ISSN">0002-7863</idno>
<imprint><date type="datePub">2015</date>
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<front><div type="abstract" xml:lang="en"> <p>We report a magic angle spinning (MAS) NMR structure of the drug-resistant S31N mutation of M218–60 from Influenza A. The protein was dispersed in diphytanoyl-sn-glycero-3-phosphocholine lipid bilayers, and the spectra and an extensive set of constraints indicate that M218–60 consists of a dimer of dimers. In particular, ∼280 structural constraints were obtained using dipole recoupling experiments that yielded well-resolved 13C–15N, 13C–13C, and 1H–15N 2D, 3D, and 4D MAS spectra, all of which show cross-peak doubling. Interhelical distances were measured using mixed 15N/13C labeling and with deuterated protein, MAS at ωr/2π = 60 kHz, ω0H/2π = 1000 MHz, and 1H detection of methyl–methyl contacts. The experiments reveal a compact structure consisting of a tetramer composed of four transmembrane helices, in which two opposing helices are displaced and rotated in the direction of the membrane normal relative to a four-fold symmetric arrangement, yielding a two-fold symmetric structure. Side chain conformations of the important gating and pH-sensing residues W41 and H37 are found to differ markedly from four-fold symmetry. The rmsd of the structure is 0.7 Å for backbone heavy atoms and 1.1 Å for all heavy atoms. This two-fold symmetric structure is different from all of the previous structures of M2, many of which were determined in detergent and/or with shorter constructs that are not fully active. The structure has implications for the mechanism of H+ transport since the distance between His and Trp residues on different helices is found to be short. The structure also exhibits two-fold symmetry in the vicinity of the binding site of adamantyl inhibitors, and steric constraints may explain the mechanism of the drug-resistant S31N mutation.</p>
</div>
</front>
</TEI>
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