5KT6

Teranry complex of human DNA polymerase iota(1-445) inserting dCMPNPP opposite template G in the presence of Mg2+

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.54 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

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This is version 1.4 of the entry. See complete history. 


Literature

Kinetic and Structural Impact of Metal Ions and Genetic Variations on Human DNA Polymerase iota.

Choi, J.Y., Patra, A., Yeom, M., Lee, Y.S., Zhang, Q., Egli, M., Guengerich, F.P.

(2016) J Biol Chem 291: 21063-21073

  • DOI: https://doi.org/10.1074/jbc.M116.748285
  • Primary Citation of Related Structures:  
    5KT2, 5KT3, 5KT4, 5KT5, 5KT6, 5KT7

  • PubMed Abstract: 

    • DNA polymerase (pol) ι is a Y-family polymerase involved in translesion synthesis, exhibiting higher catalytic activity with Mn 2+ than Mg 2+ The human germline R96G variant impairs both Mn 2+ -dependent and Mg 2+ -dependent activities of pol ι, whereas the Δ1-25 variant selectively enhances its Mg 2+ -dependent activity ...

    DNA polymerase (pol) ι is a Y-family polymerase involved in translesion synthesis, exhibiting higher catalytic activity with Mn 2+ than Mg 2+ The human germline R96G variant impairs both Mn 2+ -dependent and Mg 2+ -dependent activities of pol ι, whereas the Δ1-25 variant selectively enhances its Mg 2+ -dependent activity. We analyzed pre-steady-state kinetic and structural effects of these two metal ions and genetic variations on pol ι using pol ι core (residues 1-445) proteins. The presence of Mn 2+ (0.15 mm) instead of Mg 2+ (2 mm) caused a 770-fold increase in efficiency (k pol /K d ,dCTP ) of pol ι for dCTP insertion opposite G, mainly due to a 450-fold decrease in K d ,dCTP The R96G and Δ1-25 variants displayed a 53-fold decrease and a 3-fold increase, respectively, in k pol /K d ,dCTP for dCTP insertion opposite G with Mg 2+ when compared with wild type, substantially attenuated by substitution with Mn 2+ Crystal structures of pol ι ternary complexes, including the primer terminus 3'-OH and a non-hydrolyzable dCTP analogue opposite G with the active-site Mg 2+ or Mn 2+ , revealed that Mn 2+ achieves more optimal octahedral coordination geometry than Mg 2+ , with lower values in average coordination distance geometry in the catalytic metal A-site. Crystal structures of R96G revealed the loss of three H-bonds of residues Gly-96 and Tyr-93 with an incoming dNTP, due to the lack of an arginine, as well as a destabilized Tyr-93 side chain secondary to the loss of a cation-π interaction between both side chains. These results provide a mechanistic basis for alteration in pol ι catalytic function with coordinating metals and genetic variation.

    Organizational Affiliation: 

    the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, and f.guengerich@vanderbilt.edu.



Macromolecules

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(by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase iotaC [auth A]445Homo sapiensMutation(s): 0 
Gene Names: POLI, RAD30B
EC: 2.7.7.7
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UNA4 (Homo sapiens)
Explore Q9UNA4 
Go to UniProtKB:  Q9UNA4
PHAROS:  Q9UNA4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UNA4
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*TP*GP*GP*GP*GP*TP*CP*CP*T)-3')A [auth T]9synthetic construct
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*AP*GP*GP*AP*CP*CP*C)-3')B [auth P]7synthetic construct
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
0KX
Query on 0KX
Download Ideal Coordinates CCD File 
D [auth A]2'-deoxy-5'-O-[(R)-hydroxy{[(R)-hydroxy(phosphonooxy)phosphoryl]amino}phosphoryl]cytidine
C9 H17 N4 O12 P3
STYMTWKSQLVXJN-SHYZEUOFSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
E [auth A],
F [auth A]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.54 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.269α = 90
b = 98.269β = 90
c = 201.656γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United StatesR01 ES010375
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United StatesR01 ES010546

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-31
    Type: Initial release
  • Version 1.1: 2016-09-07
    Changes: Database references
  • Version 1.2: 2016-10-19
    Changes: Database references
  • Version 1.3: 2017-09-13
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.4: 2019-12-18
    Changes: Author supporting evidence