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| [[Image:2hgp.gif|left|200px]] | | {{Seed}} |
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| {{STRUCTURE_2hgp| PDB=2hgp | SCENE= }} | | {{STRUCTURE_2hgp| PDB=2hgp | SCENE= }} |
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| '''Crystal structure of the 70S Thermus thermophilus ribosome with translocated and rotated Shine-Dalgarno Duplex. This entry 2HGP contains 30S ribosomal subunit. The 50S ribosomal subunit can be found in PDB entry 2HGQ.'''
| | ===Crystal structure of the 70S Thermus thermophilus ribosome with translocated and rotated Shine-Dalgarno Duplex. This entry 2HGP contains 30S ribosomal subunit. The 50S ribosomal subunit can be found in PDB entry 2HGQ.=== |
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| ==Overview==
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| Translation initiation is a major determinant of the overall expression level of a gene. The translation of functionally active protein requires the messenger RNA to be positioned on the ribosome such that the start/initiation codon will be read first and in the correct frame. Little is known about the molecular basis for the interaction of mRNA with the ribosome at different states of translation. Recent crystal structures of the ribosomal subunits, the empty 70S ribosome and the 70S ribosome containing functional ligands have provided information about the general organization of the ribosome and its functional centres. Here we compare the X-ray structures of eight ribosome complexes modelling the translation initiation, post-initiation and elongation states. In the initiation and post-initiation complexes, the presence of the Shine-Dalgarno (SD) duplex causes strong anchoring of the 5'-end of mRNA onto the platform of the 30S subunit, with numerous interactions between mRNA and the ribosome. Conversely, the 5' end of the 'elongator' mRNA lacking SD interactions is flexible, suggesting a different exit path for mRNA during elongation. After the initiation of translation, but while an SD interaction is still present, mRNA moves in the 3'-->5' direction with simultaneous clockwise rotation and lengthening of the SD duplex, bringing it into contact with ribosomal protein S2.
| | The line below this paragraph, {{ABSTRACT_PUBMED_17051149}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 17051149 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_17051149}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Ribosome]] | | [[Category: Ribosome]] |
| [[Category: Shine-dalgarno]] | | [[Category: Shine-dalgarno]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 06:16:27 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 19:28:16 2008'' |
