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2JRD

Influenza Hemagglutinin Fusion Domain Mutant F9A

Summary for 2JRD
Entry DOI10.2210/pdb2jrd/pdb
Related1ibn 1ibo
NMR InformationBMRB: 15390
DescriptorHemagglutinin (1 entity in total)
Functional Keywordsinfluenza, hemagglutinin, fusion domain, f9a, viral protein
Biological sourceInfluenza A virus
Cellular locationVirion membrane; Single-pass type I membrane protein (Potential): P11134
Total number of polymer chains1
Total formula weight2712.15
Authors
Lai, A.L.,Tamm, L.K. (deposition date: 2007-06-25, release date: 2007-07-10, Last modification date: 2023-12-20)
Primary citationLai, A.L.,Tamm, L.K.
Locking the kink in the influenza hemagglutinin fusion domain structure.
J.Biol.Chem., 282:23946-23956, 2007
Cited by
PubMed Abstract: We have previously identified Trp(14) as a critical residue that stabilizes the kink in the boomerang structure of the influenza fusion domain and found that cells expressing hemagglutinin with a Trp(14) to Ala mutation cannot fuse with red blood cells. However, mutating another aromatic residue, Phe(9), on the other side of the kink did not have a significant effect on fusion or the ability of the mutant fusion peptide to bind to or perturb the bilayer structure of lipid model membranes. We reasoned that Phe is not as potent to contribute to the kink as the larger Trp and that the cooperation of Phe(9) and Ile(10) might be needed to elicit the same effect. Indeed, the double mutant F9A/I10A diminished cell-cell fusion and the ability of the fusion domain to bind to and perturb lipid bilayers in a similar fashion as the W14A mutant. A structure determination of F9A in lipid micelles by solution NMR shows that F9A adopts a similarly kinked structure as wild type. Distances between the two arms of the boomerang structure of wild type, F9A, W14A, and F9A/I10A in lipid bilayers were measured by double electron-electron resonance spectroscopy and showed that the kinks of W14A and F9A/I10A are more flexible than those of wild type and F9A. These results underscore the importance of large hydrophobic residues on both sides of the kink region of the influenza hemagglutinin fusion domain to fix the angle of the boomerang structure and thereby confer fusion function to this critical domain.
PubMed: 17567572
DOI: 10.1074/jbc.M704008200
PDB entries with the same primary citation
Experimental method
SOLUTION NMR
Structure validation

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