2iy5

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{{STRUCTURE_2iy5| PDB=2iy5 | SCENE= }}
{{STRUCTURE_2iy5| PDB=2iy5 | SCENE= }}
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'''PHENYLALANYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS COMPLEXED WITH TRNA AND A PHENYLALANYL-ADENYLATE ANALOG'''
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===PHENYLALANYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS COMPLEXED WITH TRNA AND A PHENYLALANYL-ADENYLATE ANALOG===
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==Overview==
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The crystal structure of the ternary complex of (alphabeta)(2) heterotetrameric phenylalanyl-tRNA synthetase (PheRS) from Thermus thermophilus with cognate tRNA(Phe) and a nonhydrolyzable phenylalanyl-adenylate analogue (PheOH-AMP) has been determined at 3.1 A resolution. It reveals conformational changes in tRNA(Phe) induced by the PheOH-AMP binding. The single-stranded 3' end exhibits a hairpin conformation in contrast to the partial unwinding observed previously in the binary PheRS.tRNA(Phe) complex. The CCA end orientation is stabilized by extensive base-specific interactions of A76 and C75 with the protein and by intra-RNA interactions of A73 with adjacent nucleotides. The 4-amino group of the "bulged out" C75 is trapped by two negatively charged residues of the beta subunit (Glubeta31 and Aspbeta33), highly conserved in eubacterial PheRSs. The position of the A76 base is stabilized by interactions with Hisalpha212 of motif 2 (universally conserved in PheRSs) and class II-invariant Argalpha321 of motif 3. Important conformational changes induced by the binding of tRNA(Phe) and PheOH-AMP are observed in the catalytic domain: the motif 2 loop and a "helical" loop (residues 139-152 of the alpha subunit) undergo coordinated displacement; Metalpha148 of the helical loop adopts a conformation preventing the 2'-OH group of A76 from approaching the alpha-carbonyl carbon of PheOH-AMP. The unfavorable position of the terminal ribose stems from the absence of the alpha-carbonyl oxygen in the analogue. Our data suggest that the idiosyncratic feature of PheRS, which aminoacylates the 2'-OH group of the terminal ribose, is dictated by the system-specific topology of the CCA end-binding site.
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{{ABSTRACT_PUBMED_16939209}}
==About this Structure==
==About this Structure==
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[[Category: Thermus thermophilus]]
[[Category: Thermus thermophilus]]
[[Category: Trna-binding]]
[[Category: Trna-binding]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 18:55:50 2008''

Revision as of 15:55, 27 July 2008

Image:2iy5.png

Template:STRUCTURE 2iy5

PHENYLALANYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS COMPLEXED WITH TRNA AND A PHENYLALANYL-ADENYLATE ANALOG

Template:ABSTRACT PUBMED 16939209

About this Structure

2IY5 is a Protein complex structure of sequences from Thermus thermophilus. Full crystallographic information is available from OCA.

Reference

The crystal structure of the ternary complex of phenylalanyl-tRNA synthetase with tRNAPhe and a phenylalanyl-adenylate analogue reveals a conformational switch of the CCA end., Moor N, Kotik-Kogan O, Tworowski D, Sukhanova M, Safro M, Biochemistry. 2006 Sep 5;45(35):10572-83. PMID:16939209

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