6H6A

Crystal structure of UNC119 in complex with LCK peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Ciliary Machinery Is Repurposed for T Cell Immune Synapse Trafficking of LCK.

Stephen, L.A.ElMaghloob, Y.McIlwraith, M.J.Yelland, T.Castro Sanchez, P.Roda-Navarro, P.Ismail, S.

(2018) Dev.Cell 47: 122-132.e4

  • DOI: 10.1016/j.devcel.2018.08.012

  • PubMed Abstract: 
  • Upon engagement of the T cell receptor with an antigen-presenting cell, LCK initiates TCR signaling by phosphorylating its activation motifs. However, the mechanism of LCK activation specifically at the immune synapse is a major question. We show tha ...

    Upon engagement of the T cell receptor with an antigen-presenting cell, LCK initiates TCR signaling by phosphorylating its activation motifs. However, the mechanism of LCK activation specifically at the immune synapse is a major question. We show that phosphorylation of the LCK activating Y394, despite modestly increasing its catalytic rate, dramatically focuses LCK localization to the immune synapse. We describe a trafficking mechanism whereby UNC119A extracts membrane-bound LCK by sequestering the hydrophobic myristoyl group, followed by release at the target membrane under the control of the ciliary ARL3/ARL13B. The UNC119A N terminus acts as a "regulatory arm" by binding the LCK kinase domain, an interaction inhibited by LCK Y394 phosphorylation, thus together with the ARL3/ARL13B machinery ensuring immune synapse focusing of active LCK. We propose that the ciliary machinery has been repurposed by T cells to generate and maintain polarized segregation of signals such as activated LCK at the immune synapse.


    Organizational Affiliation

    CR-UK Beatson Institute, Garscube Estate, Switchback Road, Glasgow G61 1BD, UK; Institute of Cancer Sciences, University of Glasgow, Glasgow G12 8QQ, UK.,CR-UK Beatson Institute, Garscube Estate, Switchback Road, Glasgow G61 1BD, UK.,Department of Immunology, School of Medicine, Universidad Complutense de Madrid, Madrid 28040, Spain; 12 de Octubre Health Research Institute (imas12), Madrid 28040, Spain.,CR-UK Beatson Institute, Garscube Estate, Switchback Road, Glasgow G61 1BD, UK; Institute of Cancer Sciences, University of Glasgow, Glasgow G12 8QQ, UK. Electronic address: s.ismail@beatson.gla.ac.uk.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein unc-119 homolog A
D
182Homo sapiensMutation(s): 0 
Gene Names: UNC119 (RG4)
Find proteins for Q13432 (Homo sapiens)
Go to Gene View: UNC119
Go to UniProtKB:  Q13432
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
GLY-CYS-GLY-CYS-SER-SER
E, H, K
10Homo sapiensMutation(s): 0 
Gene Names: LCK
EC: 2.7.10.2
Find proteins for P06239 (Homo sapiens)
Go to Gene View: LCK
Go to UniProtKB:  P06239
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Protein unc-119 homolog A
G, J
182Homo sapiensMutation(s): 0 
Gene Names: UNC119 (RG4)
Find proteins for Q13432 (Homo sapiens)
Go to Gene View: UNC119
Go to UniProtKB:  Q13432
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MYR
Query on MYR

Download SDF File 
Download CCD File 
E, H, K
MYRISTIC ACID
C14 H28 O2
TUNFSRHWOTWDNC-UHFFFAOYSA-N
 Ligand Interaction
PO4
Query on PO4

Download SDF File 
Download CCD File 
G, J
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
D, G, J
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
15P
Query on 15P

Download SDF File 
Download CCD File 
D
POLYETHYLENE GLYCOL (N=34)
PEG 1500
C69 H140 O35
VUYXVWGKCKTUMF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 50.090α = 90.00
b = 63.620β = 90.00
c = 188.160γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
REFMACrefinement
Aimlessdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Cancer Research UKUnited Kingdom--

Revision History 

  • Version 1.0: 2018-09-26
    Type: Initial release
  • Version 1.1: 2019-04-10
    Type: Data collection, Database references
  • Version 1.2: 2019-10-16
    Type: Data collection