TopSearch is a new powerful gateway to protein structures and their structural relationships. Given a query structure the search engine instantly returns a list of known protein structures sorted by structural similarity.
TopSearch operates on three structural levels: chains, biological assemblies/quaternary structures (yes, including ribosomes), and asymmetric units. All at the same speed! In working with structures, numbers are not enough - with TopSearch you see what you get.
The help page (below) is highly recommended for those new to the tool, as it provides a step-by-step guide on how to use its basic features; difficult to use for some browsers due to production limitations on part of the creative team.