6B1S

Hydrogen Bonding Complementary, not size complementarity is key in the formation of the double helix


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.218 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

"Skinny" and "Fat" DNA: Two New Double Helices.

Hoshika, S.Singh, I.Switzer, C.Molt Jr., R.W.Leal, N.A.Kim, M.J.Kim, M.S.Kim, H.J.Georgiadis, M.M.Benner, S.A.

(2018) J Am Chem Soc 140: 11655-11660

  • DOI: https://doi.org/10.1021/jacs.8b05042
  • Primary Citation of Related Structures:  
    6B1Q, 6B1R, 6B1S

  • PubMed Abstract: 

    According to the iconic model, the Watson-Crick double helix exploits nucleobase pairs that are both size complementary (big purines pair with small pyrimidines) and hydrogen bond complementary (hydrogen bond donors pair with hydrogen bond acceptors). Using a synthetic biology strategy, we report here the discovery of two new DNA-like systems that appear to support molecular recognition with the same proficiency as standard Watson-Crick DNA. However, these both violate size complementarity (big pairs with small), retaining hydrogen bond complementarity (donors pair with acceptors) as their only specificity principle. They exclude mismatches as well as standard Watson-Crick DNA excludes mismatches. In crystal structures, these "skinny" and "fat" systems form the expected hydrogen bonds, while conferring novel minor groove properties to the resultant duplex regions of the DNA oligonucleotides. Further, computational tools, previously tested primarily on natural DNA, appear to work well for these two new molecular recognition systems, offering a validation of the power of modern computational biology. These new molecular recognition systems may have application in materials science and synthetic biology, and in developing our understanding of alternative ways that genetic information might be stored and transmitted.


  • Organizational Affiliation

    Foundation for Applied Molecular Evolution (FfAME) , 13709 Progress Boulevard, Box 7 , Alachua , Florida 32615 , United States.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Reverse transcriptase
A, B
259Moloney murine leukemia virusMutation(s): 0 
EC: 2.7.7.49
UniProt
Find proteins for P03355 (Moloney murine leukemia virus (isolate Shinnick))
Explore P03355 
Go to UniProtKB:  P03355
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03355
Sequence Annotations
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  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*CP*TP*TP*AP*TP*AP*(CGY)P*(CGY)P*TP*TP*TP*AP*TP*AP*AP*G)-3')C [auth E],
D [auth F]
16Escherichia coli
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.218 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.119α = 90
b = 95.797β = 90
c = 144.488γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
MOSFLMdata reduction
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-19
    Type: Initial release
  • Version 1.1: 2018-09-26
    Changes: Data collection, Database references
  • Version 1.2: 2018-10-03
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.4: 2023-10-04
    Changes: Data collection, Database references, Refinement description