Role of Sequence and Structure of the Hendra Fusion Protein Fusion Peptide in Membrane Fusion
| Autor: | Trevor P. Creamer, Sonia M. Gregory, Everett Clinton Smith, Lukas K. Tamm, Rebecca Ellis Dutch |
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| Rok vydání: | 2012 |
| Předmět: |
viruses
Mutation Missense Biology Membrane Fusion Biochemistry Protein Structure Secondary Structure-Activity Relationship Protein structure Viral entry Membrane Biology Chlorocebus aethiops Animals Amino Acid Sequence Vero Cells Molecular Biology Peptide sequence Protein secondary structure chemistry.chemical_classification Host cell membrane Circular Dichroism Lipid bilayer fusion Cell Biology biochemical phenomena metabolism and nutrition Fusion protein Amino acid Amino Acid Substitution chemistry Paramyxoviridae Biophysics Viral Fusion Proteins |
| Zdroj: | Journal of Biological Chemistry. 287:30035-30048 |
| ISSN: | 0021-9258 |
| DOI: | 10.1074/jbc.m112.367862 |
| Popis: | Viral fusion proteins are intriguing molecular machines that undergo drastic conformational changes to facilitate virus-cell membrane fusion. During fusion a hydrophobic region of the protein, termed the fusion peptide (FP), is inserted into the target host cell membrane, with subsequent conformational changes culminating in membrane merger. Class I fusion proteins contain FPs between 20 and 30 amino acids in length that are highly conserved within viral families but not between. To examine the sequence dependence of the Hendra virus (HeV) fusion (F) protein FP, the first eight amino acids were mutated first as double, then single, alanine mutants. Mutation of highly conserved glycine residues resulted in inefficient F protein expression and processing, whereas substitution of valine residues resulted in hypofusogenic F proteins despite wild-type surface expression levels. Synthetic peptides corresponding to a portion of the HeV F FP were shown to adopt an α-helical secondary structure in dodecylphosphocholine micelles and small unilamellar vesicles using circular dichroism spectroscopy. Interestingly, peptides containing point mutations that promote lower levels of cell-cell fusion within the context of the whole F protein were less α-helical and induced less membrane disorder in model membranes. These data represent the first extensive structure-function relationship of any paramyxovirus FP and demonstrate that the HeV F FP and potentially other paramyxovirus FPs likely require an α-helical structure for efficient membrane disordering and fusion. |
| Databáze: | OpenAIRE |
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