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1j2b

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[[Image:1j2b.gif|left|200px]]
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{{STRUCTURE_1j2b| PDB=1j2b | SCENE= }}
{{STRUCTURE_1j2b| PDB=1j2b | SCENE= }}
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'''Crystal Structure Of Archaeosine tRNA-Guanine Transglycosylase Complexed With lambda-form tRNA(Val)'''
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===Crystal Structure Of Archaeosine tRNA-Guanine Transglycosylase Complexed With lambda-form tRNA(Val)===
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==Overview==
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Transfer RNA (tRNA) canonically has the clover-leaf secondary structure with the acceptor, D, anticodon, and T arms, which are folded into the L-shaped tertiary structure. To strengthen the L form, posttranscriptional modifications occur on nucleotides buried within the core, but the modification enzymes are paradoxically inaccessible to them in the L form. In this study, we determined the crystal structure of tRNA bound with archaeosine tRNA-guanine transglycosylase, which modifies G15 of the D arm in the core. The bound tRNA assumes an alternative conformation ("lambda form") drastically different from the L form. All of the D-arm secondary base pairs and the canonical tertiary interactions are disrupted. Furthermore, a helical structure is reorganized, while the rest of the D arm is single stranded and protruded. Consequently, the enzyme precisely locates the exposed G15 in the active site, by counting the nucleotide number from G1 to G15 in the lambda form.
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The line below this paragraph, {{ABSTRACT_PUBMED_12732145}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 12732145 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12732145}}
==About this Structure==
==About this Structure==
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[[Category: Structural genomic]]
[[Category: Structural genomic]]
[[Category: Transferase]]
[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 20:43:01 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 14:23:48 2008''

Revision as of 11:23, 1 July 2008

Image:1j2b.png

Template:STRUCTURE 1j2b

Crystal Structure Of Archaeosine tRNA-Guanine Transglycosylase Complexed With lambda-form tRNA(Val)

Template:ABSTRACT PUBMED 12732145

About this Structure

1J2B is a Single protein structure of sequence from Pyrococcus horikoshii. Full crystallographic information is available from OCA.

Reference

Alternative tertiary structure of tRNA for recognition by a posttranscriptional modification enzyme., Ishitani R, Nureki O, Nameki N, Okada N, Nishimura S, Yokoyama S, Cell. 2003 May 2;113(3):383-94. PMID:12732145

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