5BWK

6.0 A Crystal structure of a Get3-Get4-Get5 intermediate complex from S.cerevisiae

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 6.00 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.274 
  • R-Value Observed: 0.274 

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


Literature

Mechanism of Assembly of a Substrate Transfer Complex during Tail-anchored Protein Targeting.

Gristick, H.B., Rome, M.E., Chartron, J.W., Rao, M., Hess, S., Shan, S.O., Clemons, W.M.

(2015) J Biol Chem 290: 30006-30017

  • DOI: 10.1074/jbc.M115.677328
  • Primary Citation of Related Structures:  
    5BW8, 5BWK

  • PubMed Abstract: 

    • Tail-anchored (TA) proteins, defined as having a single transmembrane helix at their C terminus, are post-translationally targeted to the endoplasmic reticulum membrane by the guided entry of TA proteins (GET) pathway. In yeast, the handover of TA substr ...

    Tail-anchored (TA) proteins, defined as having a single transmembrane helix at their C terminus, are post-translationally targeted to the endoplasmic reticulum membrane by the guided entry of TA proteins (GET) pathway. In yeast, the handover of TA substrates is mediated by the heterotetrameric Get4/Get5 complex (Get4/5), which tethers the co-chaperone Sgt2 to the targeting factor, the Get3 ATPase. Binding of Get4/5 to Get3 is critical for efficient TA targeting; however, questions remain about the formation of the Get3·Get4/5 complex. Here we report crystal structures of a Get3·Get4/5 complex from Saccharomyces cerevisiae at 2.8 and 6.0 Å that reveal a novel interface between Get3 and Get4 dominated by electrostatic interactions. Kinetic and mutational analyses strongly suggest that these structures represent an on-pathway intermediate that rapidly assembles and then rearranges to the final Get3·Get4/5 complex. Furthermore, we provide evidence that the Get3·Get4/5 complex is dominated by a single Get4/5 heterotetramer bound to one monomer of a Get3 dimer, uncovering an intriguing asymmetry in the Get4/5 heterotetramer upon Get3 binding. Ultrafast diffusion-limited electrostatically driven Get3·Get4/5 association enables Get4/5 to rapidly sample and capture Get3 at different stages of the GET pathway.

    Organizational Affiliation: 

    From the Division of Chemistry and Chemical Engineering and clemons@caltech.edu.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATPase GET3 A, B, C, D, M, N, O, P373Saccharomyces cerevisiae RM11-1aMutation(s): 0 
Gene Names: GET3, SCRG_00595
EC: 3.6
Find proteins for Q12154 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q12154 
Go to UniProtKB:  Q12154
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Golgi to ER traffic protein 4 E, G, I, K, Q, S, U, W319Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: GET4, YOR164C, O3580
Find proteins for Q12125 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q12125 
Go to UniProtKB:  Q12125
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Ubiquitin-like protein MDY2 F, H, J, L, R, T, V, X56Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MDY2, GET5, TMA24, YOL111C
Find proteins for Q12285 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q12285 
Go to UniProtKB:  Q12285
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 6.00 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.274 
  • R-Value Observed: 0.274 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 152.43α = 90
b = 127.33β = 110.23
c = 210.26γ = 90
Software Package:
Software NamePurpose
CNSrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing
Cootmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-10-14
    Type: Initial release
  • Version 1.1: 2015-10-21
    Changes: Database references
  • Version 1.2: 2015-12-30
    Changes: Database references
  • Version 1.3: 2017-11-22
    Changes: Database references, Derived calculations, Refinement description