5imr | pdb_00005imr
Structure of ribosome bound to cofactor at 5.7 angstrom resolution
Structural highlights
FunctionRS7_THET8 One of the primary rRNA binding proteins, it binds directly to 3'-end of the 16S rRNA where it nucleates assembly of the head domain of the 30S subunit. Is located at the subunit interface close to the decoding center. Binds mRNA and the E site tRNA blocking its exit path in the ribosome. This blockage implies that this section of the ribosome must be able to move to release the deacetylated tRNA.[HAMAP-Rule:MF_00480_B] Publication Abstract from PubMedElongation factor 4 (EF4) is a member of the family of ribosome-dependent translational GTPase (trGTPase) factors, along with elongation factor G (EF-G) and BPI-inducible protein A (BipA). Although EF4 is highly conserved in bacterial, mitochondrial, and chloroplast genomes, its exact biological function remains controversial. Here, we present the cryo-EM reconstitution of the GTP form of EF4 bound to the ribosome with P- and E-site tRNAs at 3.8 A resolution. Interestingly, our structure reveals an unrotated ribosome rather than a clockwise-rotated ribosome, as observed in the presence of EF4-GDP and P-site tRNA. In addition, we also observed an counterclockwise rotated form of the above complex at 5.7 A resolution. Taken together, our results shed light on the interactions formed between EF4, the ribosome, and the P-site tRNA and illuminate the GTPase activation mechanism at previously unresolved detail. Structure of the GTP form of elongation factor 4 (EF4) bound to the ribosome.,Kumar V, Ero R, Ahmed T, Goh KJ, Zhan Y, Bhushan S, Gao YG J Biol Chem. 2016 May 2. pii: jbc.M116.725945. PMID:27137929[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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