2IY5

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.238 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Crystal Structure of the Ternary Complex of Phenylalanyl-tRNA Synthetase with tRNA(Phe) 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

  • DOI: 10.1021/bi060491l

  • 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 determine ...

    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

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHENYLALANYL-TRNA SYNTHETASE ALPHA CHAIN
A
350Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)Mutation(s): 0 
Gene Names: pheS
EC: 6.1.1.20
Find proteins for Q5SGX2 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SGX2
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PHENYLALANYL-TRNA SYNTHETASE BETA CHAIN
B
785Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)Mutation(s): 0 
Gene Names: pheT
EC: 6.1.1.20
Find proteins for Q5SGX1 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SGX1
Entity ID: 3
MoleculeChainsLengthOrganism
TRNAPHET76Thermus thermophilus HB8
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FYA
Query on FYA

Download SDF File 
Download CCD File 
A
ADENOSINE-5'-[PHENYLALANINOL-PHOSPHATE]
C19 H25 N6 O7 P
XNEAAYNJQROQFE-BPAMBQHCSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.238 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 173.400α = 90.00
b = 173.400β = 90.00
c = 139.400γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
CNSphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-09-06
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance