2ohc: Difference between revisions
New page: left|200px<br /><applet load="2ohc" size="350" color="white" frame="true" align="right" spinBox="true" caption="2ohc, resolution 2.50Å" /> '''structural and mutat... |
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==Overview== | ==Overview== | ||
In archaea, RNA endonucleases that act specifically on RNA with | In archaea, RNA endonucleases that act specifically on RNA with bulge-helix-bulge motifs play the main role in the recognition and excision of introns, while the eukaryal enzymes use a measuring mechanism to determine the positions of the universally positioned splice sites relative to the conserved domain of pre-tRNA. Two crystallographic structures of tRNA intron-splicing endonuclease from Thermoplasma acidophilum DSM 1728 (EndA(Ta)) have been solved to 2.5-A and 2.7-A resolution by molecular replacement, using the 2.7-A resolution data as the initial model and the single-wavelength anomalous-dispersion phasing method using selenomethionine as anomalous signals, respectively. The models show that EndA(Ta) is a homodimer and that it has overall folding similar to that of other archaeal tRNA endonucleases. From structural and mutational analyses of H236A, Y229F, and K265I in vitro, we have demonstrated that they play critical roles in recognizing the splice site and in cleaving the pre-tRNA substrate. | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Thermoplasma acidophilum]] | [[Category: Thermoplasma acidophilum]] | ||
[[Category: tRNA-intron endonuclease]] | [[Category: tRNA-intron endonuclease]] | ||
[[Category: Hwang, K | [[Category: Hwang, K Y.]] | ||
[[Category: Kim, Y | [[Category: Kim, Y K.]] | ||
[[Category: Lee, W | [[Category: Lee, W H.]] | ||
[[Category: Mizutani, K.]] | [[Category: Mizutani, K.]] | ||
[[Category: Park, S | [[Category: Park, S Y.]] | ||
[[Category: Rhee, K | [[Category: Rhee, K H.]] | ||
[[Category: endonuclease]] | [[Category: endonuclease]] | ||
[[Category: hydrolase]] | [[Category: hydrolase]] | ||
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[[Category: trna]] | [[Category: trna]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 18:18:31 2008'' | ||
Revision as of 19:18, 21 February 2008
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structural and mutational analysis of tRNA-intron splicing endonuclease from Thermoplasma acidophilum DSM1728
OverviewOverview
In archaea, RNA endonucleases that act specifically on RNA with bulge-helix-bulge motifs play the main role in the recognition and excision of introns, while the eukaryal enzymes use a measuring mechanism to determine the positions of the universally positioned splice sites relative to the conserved domain of pre-tRNA. Two crystallographic structures of tRNA intron-splicing endonuclease from Thermoplasma acidophilum DSM 1728 (EndA(Ta)) have been solved to 2.5-A and 2.7-A resolution by molecular replacement, using the 2.7-A resolution data as the initial model and the single-wavelength anomalous-dispersion phasing method using selenomethionine as anomalous signals, respectively. The models show that EndA(Ta) is a homodimer and that it has overall folding similar to that of other archaeal tRNA endonucleases. From structural and mutational analyses of H236A, Y229F, and K265I in vitro, we have demonstrated that they play critical roles in recognizing the splice site and in cleaving the pre-tRNA substrate.
About this StructureAbout this Structure
2OHC is a Single protein structure of sequence from Thermoplasma acidophilum. Active as tRNA-intron endonuclease, with EC number 3.1.27.9 Full crystallographic information is available from OCA.
ReferenceReference
Structural and mutational analysis of tRNA intron-splicing endonuclease from Thermoplasma acidophilum DSM 1728: catalytic mechanism of tRNA intron-splicing endonucleases., Kim YK, Mizutani K, Rhee KH, Nam KH, Lee WH, Lee EH, Kim EE, Park SY, Hwang KY, J Bacteriol. 2007 Nov;189(22):8339-46. Epub 2007 Sep 7. PMID:17827289
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