Crystal structure of the TPR domain of human aryl hydrocarbon receptor-interacting protein-like 1 (AIPL1)

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Interaction of the tetratricopeptide repeat domain of aryl hydrocarbon receptor-interacting protein-like 1 with the regulatory P gamma subunit of phosphodiesterase 6.

Yadav, R.P.Boyd, K.Yu, L.Artemyev, N.O.

(2019) J Biol Chem 294: 15795-15807

  • DOI: https://doi.org/10.1074/jbc.RA119.010666
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Phosphodiesterase-6 (PDE6) is key to both phototransduction and health of rods and cones. Proper folding of PDE6 relies on the chaperone activity of aryl hydrocarbon receptor-interacting protein-like 1 (AIPL1), and mutations in both PDE6 and AIPL1 can cause a severe form of blindness. Although AIPL1 and PDE6 are known to interact via the FK506-binding protein domain of AIPL1, the contribution of the tetratricopeptide repeat (TPR) domain of AIPL1 to its chaperone function is poorly understood. Here, we demonstrate that AIPL1-TPR interacts specifically with the regulatory Pγ subunit of PDE6. Use of NMR chemical shift perturbation (CSP) mapping technique revealed the interface between the C-terminal portion of Pγ and AIPL1-TPR. Our solution of the crystal structure of the AIPL1-TPR domain provided additional information, which together with the CSP data enabled us to generate a model of this interface. Biochemical analysis of chimeric AIPL1-AIP proteins supported this model and also revealed a correlation between the affinity of AIPL1-TPR for Pγ and the ability of Pγ to potentiate the chaperone activity of AIPL1. Based on these results, we present a model of the larger AIPL1-PDE6 complex. This supports the importance of simultaneous interactions of AIPL1-FK506-binding protein with the prenyl moieties of PDE6 and AIPL1-TPR with the Pγ subunit during the folding and/or assembly of PDE6. This study sheds new light on the versatility of TPR domains in protein folding by describing a novel TPR-protein binding partner, Pγ, and revealing that this subunit imparts AIPL1 selectivity for its client.

  • Organizational Affiliation

    Department of Molecular Physiology and Biophysics, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aryl-hydrocarbon-interacting protein-like 1155Homo sapiensMutation(s): 0 
Gene Names: AIPL1AIPL2
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NZN9 (Homo sapiens)
Explore Q9NZN9 
Go to UniProtKB:  Q9NZN9
GTEx:  ENSG00000129221 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NZN9
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PG4

Download Ideal Coordinates CCD File 
C8 H18 O5
Query on PEG

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B [auth A],
C [auth A]
C4 H10 O3
Query on BME

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A]
C2 H6 O S
Query on EDO

Download Ideal Coordinates CCD File 
G [auth A],
H [auth A],
I [auth A]
C2 H6 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 1.55 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.75α = 90
b = 44.17β = 100.956
c = 52.53γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Eye Institute (NIH/NEI)United StatesEY 10843

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-18
    Type: Initial release
  • Version 1.1: 2019-11-06
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-11
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Refinement description