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PDBsum entry 3lq9

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protein Protein-protein interface(s) links
Signaling protein PDB id
3lq9
Jmol
Contents
Protein chain
128 a.a. *
Waters ×203
* Residue conservation analysis
PDB id:
3lq9
Name: Signaling protein
Title: Crystal strucure of human redd1, a hypoxia-induced regulator of mtor
Structure: DNA-damage-inducible transcript 4 protein. Chain: a, b. Fragment: c-terminal functional domain. Synonym: protein regulated in development and DNA damage response 1, redd-1, hif-1 responsive protein rtp801. Engineered: yes. Mutation: yes
Source: Homo sapiens. Human. Organism_taxid: 9606. Gene: ddit4, redd1, rtp801. Expressed in: escherichia coli. Expression_system_taxid: 562. Tag
Resolution:
2.00Å     R-factor:   0.179     R-free:   0.214
Authors: S.Vega-Rubin-De-Celis,Z.Abdallah,J.Brugarolas,X.Zhang
Key ref: S.Vega-Rubin-de-Celis et al. (2010). Structural analysis and functional implications of the negative mTORC1 regulator REDD1. Biochemistry, 49, 2491-2501. PubMed id: 20166753
Date:
08-Feb-10     Release date:   09-Mar-10    
PROCHECK
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 Headers
 References

Protein chains
Pfam   ArchSchema ?
Q9NX09  (DDIT4_HUMAN) -  DNA damage-inducible transcript 4 protein
Seq:
Struc:
232 a.a.
128 a.a.
Key:    PfamA domain  Secondary structure  CATH domain

 Gene Ontology (GO) functional annotation 
  GO annot!
  Cellular component     cytoplasm   1 term 
  Biological process     negative regulation of signal transduction   1 term 

 

 
Biochemistry 49:2491-2501 (2010)
PubMed id: 20166753  
 
 
Structural analysis and functional implications of the negative mTORC1 regulator REDD1.
S.Vega-Rubin-de-Celis, Z.Abdallah, L.Kinch, N.V.Grishin, J.Brugarolas, X.Zhang.
 
  ABSTRACT  
 
REDD1 is a conserved stress-response protein that regulates mTORC1, a critical regulator of cell growth and proliferation that is implicated in cancer. REDD1 is induced by hypoxia, and REDD1 overexpression is sufficient to inhibit mTORC1. mTORC1 is regulated by the small GTPase Rheb, which in turn is regulated by the GTPase-activating protein complex, TSC1/TSC2. REDD1 induced-mTORC1 inhibition requires the TSC1/TSC2 complex, and REDD1 has been proposed to act by directly binding to and sequestering 14-3-3 proteins away from TSC2 leading to TSC2-dependent inhibition of mTORC1. Structure/function analyses have led us to identify two segments in REDD1 that are essential for function, which act in an interdependent manner. We have determined a crystal structure of REDD1 at 2.0 A resolution, which shows that these two segments fold together to form an intact domain with a novel fold. This domain is characterized by an alpha/beta sandwich consisting of two antiparallel alpha-helices and a mixed beta-sheet encompassing an uncommon psi-loop motif. Structure-based docking and functional analyses suggest that REDD1 does not directly bind to 14-3-3 proteins. Sequence conservation mapping to the surface of the structure and mutagenesis studies demarcated a hotspot likely to interact with effector proteins that is essential for REDD1-mediated mTORC1 inhibition.
 

Literature references that cite this PDB file's key reference

  PubMed id Reference
20965424 S.Sengupta, T.R.Peterson, and D.M.Sabatini (2010).
Regulation of the mTOR complex 1 pathway by nutrients, growth factors, and stress.
  Mol Cell, 40, 310-322.  
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