5IM8

Solution Structure of the Microtubule-Targeting COS Domain of MID1


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 60 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation   3D Report Full Report


This is version 1.6 of the entry. See complete history


Literature

Solution structure of the microtubule-targeting COS domain of MID1.

Wright, K.M.Du, H.Dagnachew, M.Massiah, M.A.

(2016) FEBS J 283: 3089-3102

  • DOI: https://doi.org/10.1111/febs.13795
  • Primary Citation of Related Structures:  
    5IM8

  • PubMed Abstract: 

    The human MID1 protein is required for the proper development during embryogenesis. Mutations of MID1 are associated with X-linked Opitz G syndrome, characterized by midline anomalies. MID1 associates with the microtubules and functions as an ubiquitin E3 ligase, targeting protein phosphatase 2A for ubiquitin-mediated regulation. The mechanism of microtubule association is not known. Recently, a 60-amino acid region termed the C-terminal subgroup One Signature (COS) box/domain was identified at the C-terminal end of the coiled-coil (CC) domain that facilitates microtubule localization. Insertion of the MID1 COS domain at the C-terminal end of the CC domain of a nonmicrotubule-associated TRIM protein confers microtubule localization. Here, we report the solution structure of the COS domain of MID1. The domain adopts a helix-loop-helix structure in which the N- and C-terminal ends are in close proximity. Hydrophobic residues stabilizing the interaction of the two α-helices form a central hydrophobic core. The loop separating the α-helices is structured, with two of its hydrophobic residues making contact with the central core. On the outer surface, positively charged residues form a distinct basic patch near the termini that we postulate is important for microtubule binding. A model of the structure of the preceding coiled-coil and COS domains (CC-COS) show that the COS domain forms a helical bundle at the C-terminal end of the CC domain similar to the spectrin-like fold observed with some known microtubule-binding proteins. Interestingly, the CC-COS domains bind to microtubules, demonstrating for the first time that MID1 can directly associate with the microtubules. Structural data are available in PDB database under the accession number 5IM8.


  • Organizational Affiliation

    Department of Chemistry and Center of Biomolecular Sciences, George Washington University, DC, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
E3 ubiquitin-protein ligase Midline-166Homo sapiensMutation(s): 0 
Gene Names: MID1FXYRNF59TRIM18XPRF
EC: 6.3.2 (PDB Primary Data), 2.3.2.27 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for O15344 (Homo sapiens)
Explore O15344 
Go to UniProtKB:  O15344
PHAROS:  O15344
GTEx:  ENSG00000101871 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO15344
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 60 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United States1052520, MAM

Revision History  (Full details and data files)

  • Version 1.0: 2016-07-13
    Type: Initial release
  • Version 1.1: 2016-08-31
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Author supporting evidence, Structure summary
  • Version 1.3: 2019-11-27
    Changes: Author supporting evidence, Data collection
  • Version 1.4: 2021-11-03
    Changes: Data collection, Database references
  • Version 1.5: 2023-06-14
    Changes: Other
  • Version 1.6: 2024-05-15
    Changes: Data collection, Database references