1JBT
CRYSTAL STRUCTURE OF RIBOTOXIN RESTRICTOCIN COMPLEXED WITH A 29-MER SARCIN/RICIN DOMAIN RNA ANALOG
Summary for 1JBT
| Entry DOI | 10.2210/pdb1jbt/pdb |
| Related | 1AQZ 1JBR 1JBS 430D 480D 483D |
| Descriptor | 29-MER SARCIN/RICIN DOMAIN RNA ANALOG, RESTRICTOCIN, POTASSIUM ION (3 entities in total) |
| Functional Keywords | restrictocin, ribotoxin, highly specific ribonuclease, ribonuclease t1, protein-rna recognition, hydrolase-rna complex, hydrolase/rna |
| Biological source | Aspergillus restrictus More |
| Cellular location | Secreted: P67876 |
| Total number of polymer chains | 4 |
| Total formula weight | 52767.69 |
| Authors | Yang, X.,Gerczei, T.,Glover, L.,Correll, C.C. (deposition date: 2001-06-06, release date: 2001-10-26, Last modification date: 2024-11-13) |
| Primary citation | Yang, X.,Gerczei, T.,Glover, L.T.,Correll, C.C. Crystal structures of restrictocin-inhibitor complexes with implications for RNA recognition and base flipping. Nat.Struct.Biol., 8:968-973, 2001 Cited by PubMed Abstract: The cytotoxin sarcin disrupts elongation factor binding and protein synthesis by specifically cleaving one phosphodiester bond in ribosomes. To elucidate the molecular basis of toxin action, we determined three cocrystal structures of the sarcin homolog restrictocin bound to different analogs that mimic the target sarcin/ricin loop (SRL) structure of the rat 28S rRNA. In these structures, restrictocin contacts the bulged-G motif and an unfolded form of the tetraloop of the SRL RNA. In one structure, toxin loops guide selection of the target site by contacting the base critical for recognition (G4319) and the surrounding S-shaped backbone. In another structure, base flipping of the tetraloop enables cleavage by placing the target nucleotide in the active site with the nucleophile nearly inline for attack on the scissile bond. These structures provide the first views of how a site-specific protein endonuclease recognizes and cleaves a folded RNA substrate. PubMed: 11685244DOI: 10.1038/nsb1101-968 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.7 Å) |
Structure validation
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