Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Predict Membrane 

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 9.12 kDa 
• Atom Count: 638 
• Modelled Residue Count: 82 
• Deposited Residue Count: 82 
• Unique protein chains: 1

2MIC

NMR structure of p75 transmembrane domain in DPC micelles

• PDB DOI: 10.2210/pdb2MIC/pdb
• BMRB: 19673

• Classification: MEMBRANE PROTEIN
• Organism(s): Rattus norvegicus
• Expression System: Escherichia coli
• Mutation(s): Yes 
• Membrane Protein: Yes  OPMPDBTMmpstruc


• Deposited: 2013-12-12 Released: 2014-12-24 
• Deposition Author(s): Nadezhdin, K., Arseniev, A., Goncharuk, S., Mineev, K.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: target function 

Literature

Structural Basis of p75 Transmembrane Domain Dimerization.

Nadezhdin, K.D., Garcia-Carpio, I., Goncharuk, S.A., Mineev, K.S., Arseniev, A.S., Vilar, M.

(2016) J Biol Chem 291: 12346-12357

• PubMed: 27056327 
• DOI: 10.1074/jbc.M116.723585
• Primary Citation of Related Structures:  
  2MIC, 2MJO


• PubMed Abstract: 
  

Dimerization of single span transmembrane receptors underlies their mechanism of activation. p75 neurotrophin receptor plays an important role in the nervous system, but the understanding of p75 activation mechanism is still incomplete. The transmembrane (TM) domain of p75 stabilizes the receptor dimers through a disulfide bond, essential for the NGF signaling. Here we solved by NMR the three-dimensional structure of the p75-TM-WT and the functionally inactive p75-TM-C257A dimers. Upon reconstitution in lipid micelles, p75-TM-WT forms the disulfide-linked dimers spontaneously. Under reducing conditions, p75-TM-WT is in a monomer-dimer equilibrium with the Cys(257) residue located on the dimer interface. In contrast, p75-TM-C257A forms dimers through the AXXXG motif on the opposite face of the α-helix. Biochemical and cross-linking experiments indicate that AXXXG motif is not on the dimer interface of p75-TM-WT, suggesting that the conformation of p75-TM-C257A may be not functionally relevant. However, rather than mediating p75 homodimerization, mutagenesis of the AXXXG motif reveals its functional role in the regulated intramembrane proteolysis of p75 catalyzed by the γ-secretase complex. Our structural data provide an insight into the key role of the Cys(257) in stabilization of the weak transmembrane dimer in a conformation required for the NGF signaling.

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Organizational Affiliation: 

Neurodegeneration Unit, Unidad Funcional de Investigación de Enfermedades Crónicas-Instituto de Salud Carlos III, Crta Majadahonda a Pozuelo km.2 Majadahonda, Madrid 28220, Spain [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Tumor necrosis factor receptor superfamily member 16	A, B	41	Rattus norvegicus	Mutation(s): 1  Gene Names: Ngfr, Tnfrsf16 Membrane Entity: Yes
UniProt
Find proteins for P07174 (Rattus norvegicus) Explore P07174  Go to UniProtKB:  P07174

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: target function 
• OLDERADO: 2MIC Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-12-12 
• Released Date: 2014-12-24 
Deposition Author(s): Nadezhdin, K., Arseniev, A., Goncharuk, S., Mineev, K.

Revision History  

• Version 1.0: 2014-12-24
  Type: Initial release
  
• Version 1.1: 2017-09-06
  Changes: Database references