InterPro domain: IPR028082

Periplasmic binding protein-like I domains are similar in architecture to the those included in group II, but partly differ in topology. They consist of two similar intertwined globular subdomains, both exhibiting very similar supersecondary structures which consist of a central beta-sheet flanked on either side by two or three helices [ 1 ].

1. Periplasmic binding protein structure and function. Refined X-ray structures of the leucine/isoleucine/valine-binding protein and its complex with leucine. J. Mol. Biol. 206, 171-91