Influenza Hemagglutinin... A Protein that Springs into Action with Changing pH

Influenza virus hemagglutinin:  Conformational Changes during Membrane Fusion.
The monomer conformation is represented in the models below.  In both models, the high pH structure is depicted on the left, the low pH is shown on the right.

 

   
Influenza virus hemagglutinin:  Conformational Changes during Membrane Fusion.
The actual trimer conformation is represented in the models below

http://www.ncbi.nlm.nih.gov/books/NBK21749/

www.its.caltech.edu/~bi1/files_2011/lectures/lecture14/lecture14.ppt

The high and low pH forms of the Influenza Hemagglutinin

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