The structure of BLIP reveals two structural domains, which form a polar, concave surface that docks onto a predominantly polar, convex protrusion on beta-lactamase. The ability of BLIP to adapt to a variety of class A beta-lactamases is thought to be due to flexibility between these two domains [1].

1: A potent new mode of beta-lactamase inhibition revealed by the 1.7 A X-ray crystallographic structure of the TEM-1-BLIP complex. Strynadka NC, Jensen SE, Alzari PM, James MN; Nat Struct Biol 1996;3:290-297. PMID:8605632