SecM  (seck-M)  binds to these structures and stalls their ratcheting mechanism.
SecM  (seck-M)  binds to these structures and stalls their ratcheting mechanism. A crystal structure by Venki Ramakrishnan helped prove that these structures' exit tunnels dock with the translocon. These structures bind to IRES  (EYE-ress)  sequences in eukaryotes and to namesake sites immediately five-prime to the coding sequence in prokaryotes. The 50S and 30S subunits of these structures in bacteria are usually just labelled (*)  "large" and "small". Tetracycline binds these structures and prevents their A sites from binding an aminoÂ·acyl-tRNA at the anticodon loop. These structures are synthesized by the nucleolus from a mix of protein and a namesake type of RNA. For 10 points, name these organelles that stud the rough ER, the site of protein synthesis.
SecM  (seck-M)  binds to these structures and stalls their ratcheting mechanism.
ribosome s [or  ribosomal  RNA]