Macromolecule Content

• Total Structure Weight: 5744.41 
• Atom Count: 403 
• Residue Count: 52 
• Unique protein chains: 1

1Q02

NMR structure of the UBA domain of p62 (SQSTM1)

• DOI: 10.2210/pdb1Q02/pdb

• Classification: PROTEIN BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2003-07-15 Released: 2003-09-30 
• Deposition Author(s): Ciani, B., Layfield, R., Cavey, J.R., Sheppard, P.W., Searle, M.S.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 27 
• Selection Criteria: structures with acceptable covalent geometry,structures with the least restraint violations,structures with the lowest energy 

Literature

Structure of the Ubiquitin-associated Domain of p62 (SQSTM1) and Implications for Mutations That Cause Paget's Disease of Bone

Ciani, B., Layfield, R., Cavey, J.R., Sheppard, P.W., Searle, M.S.

(2003) J.Biol.Chem. 278: 37409-37412

• PubMed: 12857745 
• DOI: 10.1074/jbc.M307416200


• PubMed Abstract: 
  

The p62 protein (also known as SQSTM1) mediates diverse cellular functions including control of NFkappaB signaling and transcriptional activation. p62 binds non-covalently to ubiquitin and co-localizes with ubiquitylated inclusions in a number of human protein aggregation diseases. Mutations in the gene encoding p62 cause Paget's disease of bone (PDB), a common disorder of the elderly characterized by excessive bone resorption and formation. All of the p62 PDB mutations identified to date cluster within the C-terminal region of the protein, which shows low sequence identity to previously characterized ubiquitin-associated (UBA) domains. We report the first NMR structure of a recombinant polypeptide that contains the C-terminal UBA domain of the human p62 protein (residues 387-436). This sequence, which confers multiubiquitin chain binding, forms a compact three-helix bundle with a structure analogous to the UBA domains of HHR23A but with differences in the loop regions connecting helices that may be involved in binding accessory proteins. We show that the Pro392 --> Leu PDB substitution mutation modifies the structure of the UBA domain by extending the N terminus of helix 1. In contrast to the p62 PDB deletion mutations that remove the UBA domain and ablate multiubiquitin chain binding, the Pro392 --> Leu substitution does not affect interaction of the UBA domain with multiubiquitin chains. Thus, phenotypically identical substitution and deletion mutations do not appear to predispose to PDB through a mechanism dependent on a common loss of ubiquitin chain binding by p62.

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Organizational Affiliation: 

School of Chemistry, University Park, Nottingham NG7 2RD, United Kingdom.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
sequestosome 1	A	52	Homo sapiens	Mutation(s): 0  Gene Names: SQSTM1 (ORCA, OSIL)
Find proteins for Q13501 (Homo sapiens) Go to Gene View: SQSTM1 Go to UniProtKB:  Q13501

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 27 
• Selection Criteria: structures with acceptable covalent geometry,structures with the least restraint violations,structures with the lowest energy 
• Olderado: 1Q02 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-07-15 
• Released Date: 2003-09-30 
• Deposition Author(s): Ciani, B., Layfield, R., Cavey, J.R., Sheppard, P.W., Searle, M.S.

Revision History 

• Version 1.0: 2003-09-30
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance