4MSB

RNA 10mer duplex with two 2'-5'-linkages


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural insights into the effects of 2'-5' linkages on the RNA duplex.

Sheng, J.Li, L.Engelhart, A.E.Gan, J.Wang, J.Szostak, J.W.

(2014) Proc Natl Acad Sci U S A 111: 3050-3055

  • DOI: https://doi.org/10.1073/pnas.1317799111
  • Primary Citation of Related Structures:  
    4MS9, 4MSB, 4MSR

  • PubMed Abstract: 

    The mixture of 2'-5' and 3'-5' linkages generated during the nonenzymatic replication of RNA has long been regarded as a central problem for the origin of the RNA world. However, we recently observed that both a ribozyme and an RNA aptamer retain considerable functionality in the presence of prebiotically plausible levels of linkage heterogeneity. To better understand the RNA structure and function in the presence of backbone linkage heterogeneity, we obtained high-resolution X-ray crystal structures of a native 10-mer RNA duplex (1.32 Å) and two variants: one containing one 2'-5' linkage per strand (1.55 Å) and one containing three such linkages per strand (1.20 Å). We found that RNA duplexes adjust their local structures to accommodate the perturbation caused by 2'-5' linkages, with the flanking nucleotides buffering the disruptive effects of the isomeric linkage and resulting in a minimally altered global structure. Although most 2'-linked sugars were in the expected 2'-endo conformation, some were partially or fully in the 3'-endo conformation, suggesting that the energy difference between these conformations was relatively small. Our structural and molecular dynamic studies also provide insight into the diminished thermal and chemical stability of the duplex state associated with the presence of 2'-5' linkages. Our results contribute to the view that a low level of 2'-5' substitution would not have been fatal in an early RNA world and may in contrast have been helpful for both the emergence of nonenzymatic RNA replication and the early evolution of functional RNAs.


  • Organizational Affiliation

    Howard Hughes Medical Institute and Center for Computational and Integrative Biology, and Department of Molecular Biology, Simches Research Center, Massachusetts General Hospital, Boston, MA 02114.


Macromolecules

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains LengthOrganismImage
RNA 10mer duplex with two 2'-5'-linkages
A, B, C, D, E
A, B, C, D, E, F
10N/A
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.15α = 90
b = 25.893β = 112.61
c = 69.722γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-12
    Type: Initial release
  • Version 1.1: 2014-03-19
    Changes: Database references
  • Version 1.2: 2018-01-24
    Changes: Advisory, Structure summary
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations