5GT8

Crystal Structure of apo-CASTOR1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.243 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structures of arginine sensor CASTOR1 in arginine-bound and ligand free states

Zhou, Y.Wang, C.Xiao, Q.Guo, L.

(2019) Biochem. Biophys. Res. Commun. 508: 387-391

  • DOI: 10.1016/j.bbrc.2018.11.147
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The mechanistic target of rapamycin (mTOR) complex 1 (mTORC1) is a master regulator of metabolism and cell growth. Among the numerous extracellular and intracellular signals, certain amino acids activate mTORC1 in a Rag-dependent manner. Arginine can ...

    The mechanistic target of rapamycin (mTOR) complex 1 (mTORC1) is a master regulator of metabolism and cell growth. Among the numerous extracellular and intracellular signals, certain amino acids activate mTORC1 in a Rag-dependent manner. Arginine can stimulate mTORC1 activity by releasing the inhibitor CASTOR1 (Cellular Arginine Sensor of mTORC1) from GATOR2, a positive regulator of mTORC1 which interacts with GATOR1, the GAP for RagA/B. Three groups have resolved the structures of arginine-CASTOR1 complex, shedding a new light on molecular basis of the regulation of mTORC1 activity by arginine. However, lacking the apo structure of CASTOR1 prelimited the molecular understanding of mechanism underlying mTORC1 regulation. Here, we report crystal structures of arginine sensor CASTOR1 in arginine-bound and ligand free states at 2.05 Å and 2.8 Å, respectively. Structural comparison of CASTOR1 between two states reveals near identical conformations, except in two loop regions. It indicates CASTOR1 does not undergo large conformational change during arginine binding. Therefore, we conclude a detailed structural interpretation of arginine sensing by CASTOR1 in mTORC1 pathway.


    Organizational Affiliation

    State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China. Electronic address: guol325@163.com.,State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GATS-like protein 3
A, B, C
335Homo sapiensMutation(s): 0 
Gene Names: CASTOR1 (GATSL3)
Find proteins for Q8WTX7 (Homo sapiens)
Go to Gene View: CASTOR1
Go to UniProtKB:  Q8WTX7
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
GATS-like protein 3
D
335Homo sapiensMutation(s): 1 
Gene Names: CASTOR1 (GATSL3)
Find proteins for Q8WTX7 (Homo sapiens)
Go to Gene View: CASTOR1
Go to UniProtKB:  Q8WTX7
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.243 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 47.410α = 90.00
b = 142.600β = 90.26
c = 95.400γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata reduction
PHENIXrefinement
PDB_EXTRACTdata extraction
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2016-08-18 
  • Released Date: 2017-08-23 
  • Deposition Author(s): Guo, L., Deng, D.

Funding OrganizationLocationGrant Number
MOSTChina2016YFA0502700

Revision History 

  • Version 1.0: 2017-08-23
    Type: Initial release
  • Version 1.1: 2019-03-13
    Type: Data collection, Database references