1TUT

J4/5 Loop from the Candida albicans and Candida dubliniensis Group I Introns

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 1 
  • Selection Criteria: closest to average 

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This is version 1.3 of the entry. See complete history. 


Literature

Structural Features and Thermodynamics of the J4/5 Loop from the Candida albicans and Candida dubliniensis Group I Introns.

Znosko, B.M., Kennedy, S.D., Wille, P.C., Krugh, T.R., Turner, D.H.

(2004) Biochemistry 43: 15822-15837

  • DOI: 10.1021/bi049256y
  • Primary Citation of Related Structures:  
    1TUT

  • PubMed Abstract: 

    • The J4/5 loop of group I introns has tertiary interactions with the P1 helix that position the P1 substrate for the self-splicing reaction. The J4/5 loop of Candida albicans and Candida dubliniensis, 5'GAAGG3'/3'UAAUU5', potentially contains two A.A pairs flanked by one G ...

    The J4/5 loop of group I introns has tertiary interactions with the P1 helix that position the P1 substrate for the self-splicing reaction. The J4/5 loop of Candida albicans and Candida dubliniensis, 5'GAAGG3'/3'UAAUU5', potentially contains two A.A pairs flanked by one G.U pair on one side and two G.U pairs on the other side. Results from optical melting, nuclear magnetic resonance spectroscopy, and functional group substitution experiments with a mimic of the C. albicans and C. dubliniensis J4/5 loop are consistent with the adenosines forming tandem sheared A.A pairs with a cross-strand stack and only the G.U pair not adjacent to an A.A pair forming a static wobble G.U pair. The two G.U pairs adjacent to the tandem A.A pairs are likely in a dynamic equilibrium between multiple conformations. Although Co(NH(3))(6)(3+) stabilizes the loop by several kilocalories per mole at 37 degrees C, addition of Mg(2+) or Co(NH(3))(6)(3+) has no effect on the structure of the loop. The tandem G.U pairs provide a pocket of negative charge for Co(NH(3))(6)(3+) to bind. The results contribute to understanding the structure and dynamics of purine-rich internal loops and potential G.U pairs adjacent to internal loops.

    Organizational Affiliation: 

    Department of Chemistry, School of Medicine and Dentistry, University of Rochester, Rochester, New York 14642, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsLengthOrganismImage
5'-R(*GP*AP*GP*GP*AP*AP*GP*GP*CP*GP*A)-3'A 11N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
5'-R(*UP*CP*GP*UP*UP*AP*AP*UP*CP*UP*C)-3'B 11N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 1 
  • Selection Criteria: closest to average 
  • OLDERADO: 1TUT Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-12-28
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-03-02
    Changes: Data collection, Database references, Derived calculations