4XBA

Hnt3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

DNA3'pp5'G de-capping activity of aprataxin: effect of cap nucleoside analogs and structural basis for guanosine recognition.

Chauleau, M.Jacewicz, A.Shuman, S.

(2015) Nucleic Acids Res. 43: 6075-6083

  • DOI: 10.1093/nar/gkv501
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • DNA3'pp5'G caps synthesized by the 3'-PO4/5'-OH ligase RtcB have a strong impact on enzymatic reactions at DNA 3'-OH ends. Aprataxin, an enzyme that repairs A5'pp5'DNA ends formed during abortive ligation by classic 3'-OH/5'-PO4 ligases, is also a DN ...

    DNA3'pp5'G caps synthesized by the 3'-PO4/5'-OH ligase RtcB have a strong impact on enzymatic reactions at DNA 3'-OH ends. Aprataxin, an enzyme that repairs A5'pp5'DNA ends formed during abortive ligation by classic 3'-OH/5'-PO4 ligases, is also a DNA 3' de-capping enzyme, converting DNAppG to DNA3'p and GMP. By taking advantage of RtcB's ability to utilize certain GTP analogs to synthesize DNAppN caps, we show that aprataxin hydrolyzes inosine and 6-O-methylguanosine caps, but is not adept at removing a deoxyguanosine cap. We report a 1.5 Å crystal structure of aprataxin in a complex with GMP, which reveals that: (i) GMP binds at the same position and in the same anti nucleoside conformation as AMP; and (ii) aprataxin makes more extensive nucleobase contacts with guanine than with adenine, via a hydrogen bonding network to the guanine O6, N1, N2 base edge. Alanine mutations of catalytic residues His147 and His149 abolish DNAppG de-capping activity, suggesting that the 3' de-guanylylation and 5' de-adenylylation reactions follow the same pathway of nucleotidyl transfer through a covalent aprataxin-(His147)-NMP intermediate. Alanine mutation of Asp63, which coordinates the guanosine ribose hydroxyls, impairs DNAppG de-capping.


    Organizational Affiliation

    Molecular Biology Program, Sloan-Kettering Institute, New York, NY 10065, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aprataxin-like protein
A, B
200Schizosaccharomyces pombe (strain 972 / ATCC 24843)Mutation(s): 0 
Gene Names: hnt3
EC: 3.1.11.7, 3.1.12.2
Find proteins for O74859 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  O74859
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
GMP
Query on GMP

Download SDF File 
Download CCD File 
A
GUANOSINE
C10 H13 N5 O5
NYHBQMYGNKIUIF-UUOKFMHZSA-N
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
5GP
Query on 5GP

Download SDF File 
Download CCD File 
B
GUANOSINE-5'-MONOPHOSPHATE
C10 H14 N5 O8 P
RQFCJASXJCIDSX-UUOKFMHZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.157 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 52.761α = 90.00
b = 72.509β = 111.25
c = 53.926γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling
Cootmodel building
PHASERphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM46330

Revision History 

  • Version 1.0: 2015-06-03
    Type: Initial release
  • Version 1.1: 2015-06-10
    Type: Database references
  • Version 1.2: 2015-07-22
    Type: Database references
  • Version 1.3: 2016-07-27
    Type: Data collection
  • Version 1.4: 2017-09-13
    Type: Author supporting evidence, Derived calculations