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| [[Image:1q86.jpg|left|200px]] | | {{Seed}} |
| | [[Image:1q86.png|left|200px]] |
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| {{STRUCTURE_1q86| PDB=1q86 | SCENE= }} | | {{STRUCTURE_1q86| PDB=1q86 | SCENE= }} |
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| '''Crystal structure of CCA-Phe-cap-biotin bound simultaneously at half occupancy to both the A-site and P-site of the the 50S ribosomal Subunit.'''
| | ===Crystal structure of CCA-Phe-cap-biotin bound simultaneously at half occupancy to both the A-site and P-site of the the 50S ribosomal Subunit.=== |
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| ==Overview==
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| The large ribosomal subunit catalyzes peptide bond formation and will do so by using small aminoacyl- and peptidyl-RNA fragments of tRNA. We have refined at 3-A resolution the structures of both A and P site substrate and product analogues, as well as an intermediate analogue, bound to the Haloarcula marismortui 50S ribosomal subunit. A P site substrate, CCA-Phe-caproic acid-biotin, binds equally to both sites, but in the presence of sparsomycin binds only to the P site. The CCA portions of these analogues are bound identically by either the A or P loop of the 23S rRNA. Combining the separate P and A site substrate complexes into one model reveals interactions that may occur when both are present simultaneously. The alpha-NH(2) group of an aminoacylated fragment in the A site forms one hydrogen bond with the N3 of A2486 (2451) and may form a second hydrogen bond either with the 2' OH of the A-76 ribose in the P site or with the 2' OH of A2486 (2451). These interactions position the alpha amino group adjacent to the carbonyl carbon of esterified P site substrate in an orientation suitable for a nucleophilic attack. | | The line below this paragraph, {{ABSTRACT_PUBMED_12185246}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 12185246 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_12185246}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Ribosome 50]] | | [[Category: Ribosome 50]] |
| [[Category: Rna-rna complex]] | | [[Category: Rna-rna complex]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:59:08 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 06:01:42 2008'' |
