Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 14.70 kDa 
• Atom Count: 1035 
• Residue Count: 128 
• Unique protein chains: 1

2I4K

Solution Structure of the PX domain of Sorting Nexin 1

• DOI: 10.2210/pdb2I4K/pdb
• BMRB: 7302

• Classification: PROTEIN TRANSPORT
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2006-08-22 Released: 2006-10-03 
• Deposition Author(s): Watson, M.J., Zhong, Q., Lazar, C.S., Hounslow, A.M., Gill, G.N., Waltho, J.P.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Literature

Determinants of the Endosomal Localization of Sorting Nexin 1

Zhong, Q., Watson, M.J., Lazar, C.S., Hounslow, A.M., Waltho, J.P., Gill, G.N.

(2005) Mol Cell Biol 16: 2049-2057

• PubMed: 15673616 
• DOI: 10.1091/mbc.e04-06-0504
• Primary Citation of Related Structures:  
  2I4K


• PubMed Abstract: 
  

The sorting nexin (SNX) family of proteins is characterized by sequence-related phox homology (PX) domains. A minority of PX domains bind with high affinity to phosphatidylinositol 3-phosphate [PI(3)P], whereas the majority of PX domains exhibit low affinity that is insufficient to target them to vesicles. SNX1 is located on endosomes, but its low affinity PX domain fails to localize in vivo. The NMR structure of the PX domain of SNX1 reveals an overall fold that is similar to high-affinity PX domains. However, the phosphatidylinositol (PI) binding pocket of the SNX1 PX domain is incomplete; regions of the pocket that are well defined in high-affinity PX domains are highly mobile in SNX1. Some of this mobility is lost upon binding PI(3)P. The C-terminal domain of SNX1 is a long helical dimer that localizes to vesicles but not to the early endosome antigen-1-containing vesicles where endogenous SNX1 resides. Thus, the obligate dimerization of SNX1 that is driven by the C-terminal domain creates a high-affinity PI binding species that properly targets the holo protein to endosomes.

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Organizational Affiliation: 

Department of Medicine and Cellular, University of California, San Diego, La Jolla, 92093-0650, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Sorting nexin-1	A	128	Homo sapiens	Mutation(s): 0  Gene Names: SNX1
Find proteins for Q13596 (Homo sapiens) Explore Q13596  Go to UniProtKB:  Q13596
NIH Common Fund Data Resources
PHAROS:  Q13596 GTEx:  ENSG00000028528

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2I4K Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-08-22 
• Released Date: 2006-10-03 
Deposition Author(s): Watson, M.J., Zhong, Q., Lazar, C.S., Hounslow, A.M., Gill, G.N., Waltho, J.P.

Revision History 

• Version 1.0: 2006-10-03
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2020-02-19
  Changes: Data collection, Database references, Derived calculations, Other