2IY5

PHENYLALANYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS complexed with tRNA and a phenylalanyl-adenylate analog

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.238 

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This is version 1.3 of the entry. See complete history. 


Literature

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.

(2006) Biochemistry 45: 10572-10583

  • DOI: 10.1021/bi060491l
  • Primary Citation of Related Structures:  
    2IY5

  • PubMed Abstract: 

    • 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 ...

    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.

    Organizational Affiliation: 

    Institute of Chemical Biology and Fundamental Medicine, 630090 Novosibirsk, Russia.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PHENYLALANYL-TRNA SYNTHETASE ALPHA CHAINA350Thermus thermophilus HB8Mutation(s): 0 
Gene Names: pheS, TTHA1958
EC: 6.1.1.20
UniProt
Find proteins for Q5SGX2 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SGX2 
Go to UniProtKB:  Q5SGX2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SGX2
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PHENYLALANYL-TRNA SYNTHETASE BETA CHAINB785Thermus thermophilus HB8Mutation(s): 0 
Gene Names: pheT, TTHA1959
EC: 6.1.1.20
UniProt
Find proteins for Q5SGX1 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SGX1 
Go to UniProtKB:  Q5SGX1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SGX1
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsLengthOrganismImage
TRNAPHEC [auth T]76Thermus thermophilus HB8
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FYA
Query on FYA
Download Ideal Coordinates CCD File 
D [auth A]ADENOSINE-5'-[PHENYLALANINOL-PHOSPHATE]
C19 H25 N6 O7 P
XNEAAYNJQROQFE-BPAMBQHCSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
E [auth B]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.238 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 173.4α = 90
b = 173.4β = 90
c = 139.4γ = 120
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-09-06
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-09-18
    Changes: Data collection, Database references, Experimental preparation