6C90

Human Mtr4 helicase in complex with ZCCHC8-CTD


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Structural basis for MTR4-ZCCHC8 interactions that stimulate the MTR4 helicase in the nuclear exosome-targeting complex.

Puno, M.R.Lima, C.D.

(2018) Proc Natl Acad Sci U S A 115: E5506-E5515

  • DOI: https://doi.org/10.1073/pnas.1803530115
  • Primary Citation of Related Structures:  
    6C90

  • PubMed Abstract: 

    The nuclear exosome-targeting (NEXT) complex functions as an RNA exosome cofactor and is involved in surveillance and turnover of aberrant transcripts and noncoding RNAs. NEXT is a ternary complex composed of the RNA-binding protein RBM7, the scaffold zinc-knuckle protein ZCCHC8, and the helicase MTR4. While RNA interactions with RBM7 are known, it remains unclear how NEXT subunits collaborate to recognize and prepare substrates for degradation. Here, we show that MTR4 helicase activity is enhanced when associated with RBM7 and ZCCHC8. While uridine-rich substrates interact with RBM7 and are preferred, optimal activity is observed when substrates include a polyadenylated 3' end. We identify a bipartite interaction of ZCCHC8 with MTR4 and uncover a role for the conserved C-terminal domain of ZCCHC8 in stimulating MTR4 helicase and ATPase activities. A crystal structure reveals that the ZCCHC8 C-terminal domain binds the helicase core in a manner that is distinct from that observed for Saccharomyces cerevisiae exosome cofactors Trf4p and Air2p. Our results are consistent with a model whereby effective targeting of substrates by NEXT entails recognition of elements within the substrate and activation of MTR4 helicase activity.


  • Organizational Affiliation

    Structural Biology Program, Sloan Kettering Institute, New York, NY 10065.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Exosome RNA helicase MTR4,Exosome RNA helicase MTR4734Homo sapiensMutation(s): 0 
Gene Names: MTREXDOB1KIAA0052MTR4SKIV2L2
EC: 3.6.4.13
UniProt & NIH Common Fund Data Resources
Find proteins for P42285 (Homo sapiens)
Explore P42285 
Go to UniProtKB:  P42285
PHAROS:  P42285
GTEx:  ENSG00000039123 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42285
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Zinc finger CCHC domain-containing protein 852Homo sapiensMutation(s): 0 
Gene Names: ZCCHC8
UniProt & NIH Common Fund Data Resources
Find proteins for Q6NZY4 (Homo sapiens)
Explore Q6NZY4 
Go to UniProtKB:  Q6NZY4
PHAROS:  Q6NZY4
GTEx:  ENSG00000033030 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6NZY4
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download Ideal Coordinates CCD File 
C [auth A]ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
TLA
Query on TLA

Download Ideal Coordinates CCD File 
J [auth A]L(+)-TARTARIC ACID
C4 H6 O6
FEWJPZIEWOKRBE-JCYAYHJZSA-N
MLI
Query on MLI

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
H [auth A],
I [auth A]
MALONATE ION
C3 H2 O4
OFOBLEOULBTSOW-UHFFFAOYSA-L
MG
Query on MG

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 147.635α = 90
b = 147.635β = 90
c = 101.589γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM118080
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2018-05-30
    Type: Initial release
  • Version 1.1: 2018-06-13
    Changes: Data collection, Database references
  • Version 1.2: 2018-06-20
    Changes: Data collection, Database references
  • Version 1.3: 2019-11-20
    Changes: Author supporting evidence
  • Version 1.4: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description