6HTE

Sulfolobus solfataricus Tryptophan Synthase B2a


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.166 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Evolutionary Morphing of Tryptophan Synthase: Functional Mechanisms for the Enzymatic Channeling of Indole.

Fleming, J.R.Schupfner, M.Busch, F.Basle, A.Ehrmann, A.Sterner, R.Mayans, O.

(2018) J Mol Biol 430: 5066-5079

  • DOI: https://doi.org/10.1016/j.jmb.2018.10.013
  • Primary Citation of Related Structures:  
    5N2P, 6HTE, 6HUL

  • PubMed Abstract: 

    Tryptophan synthase (TrpS) is a heterotetrameric αββα enzyme that exhibits complex substrate channeling and allosteric mechanisms and is a model system in enzymology. In this work, we characterize proposed early and late evolutionary states of TrpS and show that they have distinct quaternary structures caused by insertions-deletions of sequence segments (indels) in the β-subunit. Remarkably, indole hydrophobic channels that connect α and β active sites have re-emerged in both TrpS types, yet they follow different paths through the β-subunit fold. Also, both TrpS geometries activate the α-subunit through the rearrangement of loops flanking the active site. Our results link evolutionary sequence changes in the enzyme subunits with channeling and allostery in the TrpS enzymes. The findings demonstrate that indels allow protein quaternary architectures to escape "minima" in the evolutionary landscape, thereby overcoming the conservational constraints imposed by existing functional interfaces and being free to morph into new mechanistic enzymes.


  • Organizational Affiliation

    Department of Biology, University of Konstanz, 78457 Konstanz, Germany.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tryptophan synthase beta chain 2A [auth B],
B [auth D]
425Saccharolobus solfataricusMutation(s): 0 
Gene Names: trpB2SSO1145
EC: 4.2.1.20
UniProt
Find proteins for Q97TX6 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q97TX6 
Go to UniProtKB:  Q97TX6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97TX6
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.166 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.89α = 90
b = 61.71β = 99.33
c = 110.36γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-11-21
    Type: Initial release
  • Version 1.1: 2019-06-26
    Changes: Data collection, Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Refinement description