1U79

Crystal structure of AtFKBP13


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural analysis uncovers a role for redox in regulating FKBP13, an immunophilin of the chloroplast thylakoid lumen

Gopalan, G.He, Z.Balmer, Y.Romano, P.Gupta, R.Buchanan, B.B.Swaminathan, K.Luan, S.

(2004) Proc Natl Acad Sci U S A 101: 13945-13950

  • DOI: 10.1073/pnas.0405240101
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Change in redox status has long been known to link light to the posttranslational regulation of chloroplast enzymes. So far, studies have been conducted primarily with thioredoxin-linked members of the stroma that function in a broad array of biosynt ...

    Change in redox status has long been known to link light to the posttranslational regulation of chloroplast enzymes. So far, studies have been conducted primarily with thioredoxin-linked members of the stroma that function in a broad array of biosynthetic and degradatory processes. Consequently, little is known about the role of redox in regulating the growing number of enzymes found to occur in the lumen, the site of oxygen evolution in thylakoid membranes. To help fill this gap, we have studied AtFKBP13, an FKBP-type immunophilin earlier shown to interact with a redox-active protein of the lumen, and found the enzyme to contain a pair of disulfide bonds in x-ray structural studies. These disulfides, which in protein mutagenesis experiments were shown to be essential for the associated peptidyl-prolyl isomerase activity, are unique to chloroplast FKBPs and are absent in animal and yeast counterparts. Both disulfide bonds were redox-active and were reduced by thioredoxin from either chloroplast or bacterial sources in a reaction that led to loss of enzyme activity. The results suggest a previously unrecognized paradigm for redox regulation in chloroplasts in which activation by light is achieved in concert with oxygen evolution by the oxidation of sulfhydryl groups (conversion of SH to S-S). Such a mechanism, occurring in the thylakoid lumen, is in direct contrast to regulation of enzymes in the stroma, where reduction of disulfides targeted by thioredoxin (S-S converted to SH) leads to an increase in activity in the light.


    Related Citations: 
    • A chloroplast FKBP interacts with and affects the accumulation of Rieske subunit of cytochrome bf complex
      Gupta, R., Mould, R.M., He, Z., Luan, S.
      (2002) Proc Natl Acad Sci U S A 99: 15806

    Organizational Affiliation

    Department of Biological Sciences, National University of Singapore, Singapore 119260.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FKBP-type peptidyl-prolyl cis-trans isomerase 3
A, B, C, D, E
129Arabidopsis thalianaMutation(s): 0 
Gene Names: AtFKBP13FKBP13FKBP22-1FKBPKAt5g45680MRA19.7
EC: 5.2.1.8
Find proteins for Q9SCY2 (Arabidopsis thaliana)
Go to UniProtKB:  Q9SCY2
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.212 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.026α = 90
b = 126.606β = 90
c = 119.404γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CCP4model building
CNSrefinement
CCP4phasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-09-28
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance