Proteins with a ring.
Proteins come in all sizes and shapes. Those which fold into a ring with a large hole in the middle may act as a clamp on DNA, a polysaccharide or another protein.
Janin
J
J
Laboratoire de Biologie Structurale, UMR 9920 CNRS-Université Paris-Sud, Gif-sur-Yvette, France.
D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism; D004264:DNA Topoisomerases, Type I / Q000737:chemistry / Q000378:metabolism; D029968:Escherichia coli Proteins; D006026:Glycoside Hydrolases; D016695:Glycosyltransferases / Q000737:chemistry / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins; D008958:Models, Molecular; D011487:Protein Conformation; D011506:Proteins / Q000737:chemistry* / Q000378:metabolism*; D013329:Structure-Activity Relationship
D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D047908:Intracellular Signaling Peptides and Proteins; D011506:Proteins; C066953:ribonuclease inhibitor, porcine; D016695:Glycosyltransferases; D006026:Glycoside Hydrolases; C085428:slt protein, E coli; D004264:DNA Topoisomerases, Type I