5ZYO

Crystal Structure of domain-swapped Circular-Permuted YbeA (CP74) from Escherichia coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Untying a Knotted SPOUT RNA Methyltransferase by Circular Permutation Results in a Domain-Swapped Dimer.

Ko, K.T.Hu, I.C.Huang, K.F.Lyu, P.C.Hsu, S.D.

(2019) Structure 27: 1224-1233.e4

  • DOI: https://doi.org/10.1016/j.str.2019.04.004
  • Primary Citation of Related Structures:  
    5ZYO

  • PubMed Abstract: 

    YbeA from E. coli is a trefoil-knotted SpoU-TrmD (SPOUT) RNA methyltransferase. While its knotted motif plays a key functional role, it is unclear how the knotted topology emerged from evolution. Here, we reverse-engineered an unknotted circular permutant (CP) of YbeA by introducing a new opening at the knotting loop. The resulting CP folded into an unexpected domain-swapped dimer. Untying the knotted loop abrogated its function, perturbed its folding stability and kinetics, and induced allosteric dynamic changes. We speculated that the knotted loop of YbeA is under tension to keep the cofactor in a high-energy configuration while keeping the threading C-terminal helix being knotted. Circular permutation released the mechanical strain thereby allowing the spring-loaded threading helix to flip, to relax, and to form a domain-swapped dimer. Being knotted may be the consequence of selection pressure for the unique structure-function relationship of the SPOUT superfamily that exists in all kingdoms of life.


  • Organizational Affiliation

    Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan; Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu 30013, Taiwan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribosomal RNA large subunit methyltransferase H
A, B, C, D
158Escherichia coli K-12Mutation(s): 0 
Gene Names: rlmHybeAb0636JW0631
EC: 2.1.1.177
UniProt
Find proteins for P0A8I8 (Escherichia coli (strain K12))
Explore P0A8I8 
Go to UniProtKB:  P0A8I8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A8I8
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.458α = 90
b = 88.053β = 101.47
c = 81.184γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Blu-Icedata collection
HKL-2000data scaling
HKL-2000data reduction
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (Taiwan)Taiwan106-2113-M-001-004
Ministry of Science and Technology (Taiwan)Taiwan107-2628-M-001-005-MY3
Ministry of Science and Technology (Taiwan)Taiwan106-2311-B-007-004-MY3
Academia Sinica (Taiwan)Taiwan--

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-29
    Type: Initial release
  • Version 1.1: 2019-06-05
    Changes: Data collection, Database references
  • Version 1.2: 2019-08-21
    Changes: Data collection, Database references