2g8q: Difference between revisions
New page: left|200px<br /><applet load="2g8q" size="450" color="white" frame="true" align="right" spinBox="true" caption="2g8q, resolution 1.50Å" /> '''The crystal structur... |
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[[Image:2g8q.gif|left|200px]]<br /><applet load="2g8q" size=" | [[Image:2g8q.gif|left|200px]]<br /><applet load="2g8q" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="2g8q, resolution 1.50Å" /> | caption="2g8q, resolution 1.50Å" /> | ||
'''The crystal structure of RNase A from monoclinic crystals at 100 K'''<br /> | '''The crystal structure of RNase A from monoclinic crystals at 100 K'''<br /> | ||
==Overview== | ==Overview== | ||
The binding of a moderate inhibitor, 3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine, to ribonuclease A has | The binding of a moderate inhibitor, 3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine, to ribonuclease A has been studied by X-ray crystallography at 1.7A resolution. Two inhibitor molecules are bound in the central RNA binding cavity of RNase A exploiting interactions with residues from peripheral binding sites rather than from the active site of the enzyme. The uracyl moiety of the first inhibitor molecule occupies the purine-preferring site of RNase A, while the rest of the molecule projects to the solvent. The second inhibitor molecule binds with the carboxyl group at the pyrimidine recognition site and the uridine moiety exploits interactions with RNase A residues Lys66, His119 and Asp121. Comparative structural analysis of the 3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine complex with other RNase A-ligand complexes provides a structural explanation of its potency. The crystal structure of the RNase A-3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine complex provides evidence of a novel ligand-binding pattern in RNase A for 3'-N-aminonucleosides that was not anticipated by modelling studies, while it also suggests ways to improve the efficiency and selectivity of such compounds to develop pharmaceuticals against pathologies associated with RNase A homologues. | ||
==About this Structure== | ==About this Structure== | ||
2G8Q is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Active as [http://en.wikipedia.org/wiki/Pancreatic_ribonuclease Pancreatic ribonuclease], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.27.5 3.1.27.5] Full crystallographic information is available from [http:// | 2G8Q is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Active as [http://en.wikipedia.org/wiki/Pancreatic_ribonuclease Pancreatic ribonuclease], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.27.5 3.1.27.5] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2G8Q OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Pancreatic ribonuclease]] | [[Category: Pancreatic ribonuclease]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Leonidas, D | [[Category: Leonidas, D D.]] | ||
[[Category: Oikonomakos, N | [[Category: Oikonomakos, N G.]] | ||
[[Category: Zographos, S | [[Category: Zographos, S E.]] | ||
[[Category: endonuclease]] | [[Category: endonuclease]] | ||
[[Category: hydrolase]] | [[Category: hydrolase]] | ||
[[Category: ribonuclease]] | [[Category: ribonuclease]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:29:16 2008'' | ||
