Phyre2 is a suite of tools available on the web to predict and analyze protein structure, function and mutations.
The server is available at http://www.sbg.bio.ic.ac.uk/phyre2
(Kelley, L., Mezulis, S., Yates, C. et al. The Phyre2 web portal for protein modeling, prediction and analysis. Nat Protoc 10, 845–858 (2015) doi:10.1038/nprot.2015.053)