Dear all, maybe you would be interested in our (slip)knotted protein structures database: http://knotprot.cent.uw.edu.pl/
If you have any improvements suggestions - let me know, please. It will be published in '15 NAR Database Issue (Jamroz et al. : KnotProt: a database of proteins with knots and slipknots) PS sorry if it's offtopic/spam. Greetings, Michał Jamróz Faculty of Chemistry, University of Warsaw, Poland