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. 1996 Sep;70(9):6112–6118. doi: 10.1128/jvi.70.9.6112-6118.1996

Functional interaction of paramyxovirus glycoproteins: identification of a domain in Sendai virus HN which promotes cell fusion.

K Tanabayashi 1, R W Compans 1
PMCID: PMC190633  PMID: 8709235

Abstract

The cell fusion activity of most paramyxoviruses requires coexpression of a fusion protein (F) and a hemagglutinin-neuraminidase protein (HN) which are derived from the same virus type. To define the domain of the HN protein which interacts with the F protein in a type-specific manner a series of chimeric HN proteins between two different paramyxoviruses, Sendai virus (SN) and human parainfluenza virus type 3 (PI3), was constructed and coexpressed with the SN-F protein by using the vaccinia virus T7 RNA polymerase transient-expression system. Quantitative assays were used to evaluate cell surface expression as well as fusion-promoting activities of the chimeric HN molecules. A chimeric HN protein [SN(140)] containing 140 N-terminal amino acids derived from SN-HN and the remainder (432 amino acids) derived from PI3-HN was found to promote cell fusion with the SN-F protein. In contrast, a second chimeric HN with 137 amino acids from SN-HN at the N terminus could not promote fusion with SN-F, even though the protein was expressed on the cell surface. A construct in which the PI3-HN cytoplasmic tail and transmembrane domain were substituted for those of SN in the SN(140) chimera still maintained the ability to promote cell fusion. These results indicate that a region including only 82 amino acids in the extracellular domain, adjacent to the transmembrane domain of the SN-HN protein, is important for interaction with the SN-F protein and promotion of cell fusion.

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Selected References

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