The Blast Protein tool performs a blast or psiblast search of pdb or nr for sequences similar to a query, using a Web service hosted by the UCSF RBVI. The query can be:

• a chain from a structure open in Chimera
• a sequence pasted as plain text
• a sequence from an alignment in Multalign Viewer

• as a pseudo-multiple sequence alignment (a consolidation of the pairwise alignments of individual hits to the query), automatically shown in Multalign Viewer
• as structures (for hits from pdb), automatically superimposed according to the pseudo-multiple alignment

The image shows the structure of the human OX2 orexin receptor bound to the insomnia drug suvorexant, Protein Data Bank entry 4s0v. The drug is shown as spheres colored by element, and the receptor as ribbons with secondary structure elements rainbow-colored from blue at the N-terminus to red at the C-terminus. (More samples...)