3UO3

Jac1 co-chaperone from Saccharomyces cerevisiae, 5-182 clone


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Interaction of j-protein co-chaperone jac1 with fe-s scaffold isu is indispensable in vivo and conserved in evolution.

Ciesielski, S.J.Schilke, B.A.Osipiuk, J.Bigelow, L.Mulligan, R.Majewska, J.Joachimiak, A.Marszalek, J.Craig, E.A.Dutkiewicz, R.

(2012) J Mol Biol 417: 1-12

  • DOI: 10.1016/j.jmb.2012.01.022
  • Primary Citation of Related Structures:  
    3UO2, 3UO3

  • PubMed Abstract: 
  • The ubiquitous mitochondrial J-protein Jac1, called HscB in Escherichia coli, and its partner Hsp70 play a critical role in the transfer of Fe-S clusters from the scaffold protein Isu to recipient proteins. Biochemical results from eukaryotic and prokaryotic systems indicate that formation of the Jac1-Isu complex is important for both targeting of the Isu for Hsp70 binding and stimulation of Hsp70's ATPase activity ...

    The ubiquitous mitochondrial J-protein Jac1, called HscB in Escherichia coli, and its partner Hsp70 play a critical role in the transfer of Fe-S clusters from the scaffold protein Isu to recipient proteins. Biochemical results from eukaryotic and prokaryotic systems indicate that formation of the Jac1-Isu complex is important for both targeting of the Isu for Hsp70 binding and stimulation of Hsp70's ATPase activity. However, in apparent contradiction, we previously reported that an 8-fold decrease in Jac1's affinity for Isu1 is well tolerated in vivo, raising the question as to whether the Jac1:Isu interaction actually plays an important biological role. Here, we report the determination of the structure of Jac1 from Saccharomyces cerevisiae. Taking advantage of this information and recently published data from the homologous bacterial system, we determined that a total of eight surface-exposed residues play a role in Isu binding, as assessed by a set of biochemical assays. A variant having alanines substituted for these eight residues was unable to support growth of a jac1-Δ strain. However, replacement of three residues caused partial loss of function, resulting in a significant decrease in the Jac1:Isu1 interaction, a slow growth phenotype, and a reduction in the activity of Fe-S cluster-containing enzymes. Thus, we conclude that the Jac1:Isu1 interaction plays an indispensable role in the essential process of mitochondrial Fe-S cluster biogenesis.


    Organizational Affiliation

    Department of Molecular and Cellular Biology, Faculty of Biotechnology, University of Gdansk, 24 Kladki, Gdansk 80822, Poland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
J-type co-chaperone JAC1, mitochondrialA, B181Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: JAC1SEO2YGL018C
UniProt
Find proteins for P53193 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P53193 
Go to UniProtKB:  P53193
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download Ideal Coordinates CCD File 
C [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.791α = 90
b = 60.45β = 90
c = 108.886γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
SBC-Collectdata collection
HKL-3000data reduction
HKL-3000data scaling
MOLREPphasing
HKL-3000phasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-14
    Type: Initial release
  • Version 1.1: 2012-03-21
    Changes: Database references
  • Version 1.2: 2012-05-23
    Changes: Structure summary
  • Version 1.3: 2013-05-22
    Changes: Structure summary
  • Version 1.4: 2017-11-08
    Changes: Refinement description