6UKE

HhaI endonuclease in Complex with Iodine-Labelled DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of HhaI endonuclease with cognate DNA at an atomic resolution of 1.0 angstrom.

Horton, J.R.Yang, J.Zhang, X.Petronzio, T.Fomenkov, A.Wilson, G.G.Roberts, R.J.Cheng, X.

(2020) Nucleic Acids Res 48: 1466-1478

  • DOI: https://doi.org/10.1093/nar/gkz1195
  • Primary Citation of Related Structures:  
    6UKE, 6UKF, 6UKG, 6UKH, 6UKI

  • PubMed Abstract: 

    HhaI, a Type II restriction endonuclease, recognizes the symmetric sequence 5'-GCG↓C-3' in duplex DNA and cleaves ('↓') to produce fragments with 2-base, 3'-overhangs. We determined the structure of HhaI in complex with cognate DNA at an ultra-high atomic resolution of 1.0 Å. Most restriction enzymes act as dimers with two catalytic sites, and cleave the two strands of duplex DNA simultaneously, in a single binding event. HhaI, in contrast, acts as a monomer with only one catalytic site, and cleaves the DNA strands sequentially, one after the other. HhaI comprises three domains, each consisting of a mixed five-stranded β sheet with a defined function. The first domain contains the catalytic-site; the second contains residues for sequence recognition; and the third contributes to non-specific DNA binding. The active-site belongs to the 'PD-D/EXK' superfamily of nucleases and contains the motif SD-X11-EAK. The first two domains are similar in structure to two other monomeric restriction enzymes, HinP1I (G↓CGC) and MspI (C↓CGG), which produce fragments with 5'-overhangs. The third domain, present only in HhaI, shifts the positions of the recognition residues relative to the catalytic site enabling this enzyme to cleave the recognition sequence at a different position. The structure of M.HhaI, the biological methyltransferase partner of HhaI, was determined earlier. Together, these two structures represent the first natural pair of restriction-modification enzymes to be characterized in atomic detail.


  • Organizational Affiliation

    Department of Epigenetics & Molecular Carcinogenesis, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HhaI Restriction EndonucleaseA [auth X]258Haemophilus parahaemolyticusMutation(s): 0 
Gene Names: HMPREF1050_0931
EC: 3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*TP*CP*CP*AP*AP*GP*CP*GP*CP*AP*AP*CP*G)-3')B [auth A]13Haemophilus parahaemolyticus
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(*CP*GP*(5IT)P*TP*GP*CP*GP*CP*TP*(5IT)P*GP*GP*A)-3')C [auth B]13Haemophilus parahaemolyticus
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download Ideal Coordinates CCD File 
U [auth X]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
EDO
Query on EDO

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E [auth X]
F [auth X]
G [auth X]
H [auth X]
I [auth X]
E [auth X],
F [auth X],
G [auth X],
H [auth X],
I [auth X],
J [auth X],
K [auth X],
L [auth X],
M [auth X],
N [auth X],
O [auth X],
P [auth X],
Q [auth X],
R [auth X],
S [auth X],
V [auth A],
W [auth A],
X [auth A],
Z [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
ACT
Query on ACT

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T [auth X],
Y [auth A]
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
CA
Query on CA

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D [auth X]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.89α = 90
b = 37.193β = 109.796
c = 68.744γ = 90
Software Package:
Software NamePurpose
JDirectordata collection
PHENIXrefinement
CrysalisProdata reduction
Aimlessdata scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM049245-23

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-18
    Type: Initial release
  • Version 1.1: 2020-01-08
    Changes: Database references
  • Version 1.2: 2020-03-04
    Changes: Database references
  • Version 1.3: 2024-03-13
    Changes: Data collection, Database references, Derived calculations