title: Crystal structure of Thermotoga maritima ribosome recycling factor: a tRNA mimic.
abstract: Ribosome recycling factor (RRF), together with elongation factor G (EF-G), catalyzes recycling of ribosomes after one round of protein synthesis. The crystal structure of RRF was determined at 2.55 angstrom resolution. The protein has an unusual fold where domain I is a long three-helix bundle and domain II is a three-layer beta/alpha/beta sandwich. The molecule superimposes almost perfectly with a transfer RNA (tRNA) except that the amino acid-binding 3' end is missing. The mimicry suggests that RRF interacts with the posttermination ribosomal complex in a similar manner to a tRNA, leading to disassembly of the complex. The structural arrangement of this mimicry is entirely different from that of other cases of less pronounced mimicry of tRNA so far described.
authors.affiliation: Molecular Biophysics, Center for Chemistry and Chemical Engineering, Lund University, Post Office Box 124, SE-22100 Lund, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Selmer
authors.forename: S
authors.initials: S
authors.lastname: Al-Karadaghi
authors.forename: G
authors.initials: G
authors.lastname: Hirokawa
authors.forename: A
authors.initials: A
authors.lastname: Kaji
authors.forename: A
authors.initials: A
authors.lastname: Liljas
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D018716:Molecular Mimicry; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D020653:Peptide Elongation Factor G / Q000737:chemistry; D014176:Protein Biosynthesis; D011487:Protein Conformation; D017510:Protein Folding; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D011506:Proteins / Q000737:chemistry* / Q000378:metabolism*; D012329:RNA, Bacterial / Q000737:chemistry / Q000378:metabolism; D012331:RNA, Fungal / Q000737:chemistry / Q000378:metabolism; D012343:RNA, Transfer / Q000737:chemistry* / Q000378:metabolism; D012360:RNA, Transfer, Phe / Q000737:chemistry / Q000378:metabolism; D012269:Ribosomal Proteins; D012270:Ribosomes / Q000378:metabolism*; D016415:Sequence Alignment; D020124:Thermotoga maritima / Q000737:chemistry* / Q000378:metabolism
chemical_list: D020653:Peptide Elongation Factor G; D011506:Proteins; D012329:RNA, Bacterial; D012331:RNA, Fungal; D012360:RNA, Transfer, Phe; D012269:Ribosomal Proteins; C087267:ribosome releasing factor; D012343:RNA, Transfer