5LGG

The N-terminal WD40 domain of Apc1 (Anaphase promoting complex subunit 1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

WD40 domain of Apc1 is critical for the coactivator-induced allosteric transition that stimulates APC/C catalytic activity.

Li, Q.Chang, L.Aibara, S.Yang, J.Zhang, Z.Barford, D.

(2016) Proc.Natl.Acad.Sci.USA 113: 10547-10552

  • DOI: 10.1073/pnas.1607147113

  • PubMed Abstract: 
  • The anaphase-promoting complex/cyclosome (APC/C) is a large multimeric cullin-RING E3 ubiquitin ligase that orchestrates cell-cycle progression by targeting cell-cycle regulatory proteins for destruction via the ubiquitin proteasome system. The APC/C ...

    The anaphase-promoting complex/cyclosome (APC/C) is a large multimeric cullin-RING E3 ubiquitin ligase that orchestrates cell-cycle progression by targeting cell-cycle regulatory proteins for destruction via the ubiquitin proteasome system. The APC/C assembly comprises two scaffolding subcomplexes: the platform and the TPR lobe that together coordinate the juxtaposition of the catalytic and substrate-recognition modules. The platform comprises APC/C subunits Apc1, Apc4, Apc5, and Apc15. Although the role of Apc1 as an APC/C scaffolding subunit has been characterized, its specific functions in contributing toward APC/C catalytic activity are not fully understood. Here, we report the crystal structure of the N-terminal domain of human Apc1 (Apc1N) determined at 2.2-Å resolution and provide an atomic-resolution description of the architecture of its WD40 (WD40 repeat) domain (Apc1(WD40)). To understand how Apc1(WD40) contributes to APC/C activity, a mutant form of the APC/C with Apc1(WD40) deleted was generated and evaluated biochemically and structurally. We found that the deletion of Apc1(WD40) abolished the UbcH10-dependent ubiquitination of APC/C substrates without impairing the Ube2S-dependent ubiquitin chain elongation activity. A cryo-EM structure of an APC/C-Cdh1 complex with Apc1(WD40) deleted showed that the mutant APC/C is locked into an inactive conformation in which the UbcH10-binding site of the catalytic module is inaccessible. Additionally, an EM density for Apc15 is not visible. Our data show that Apc1(WD40) is required to mediate the coactivator-induced conformational change of the APC/C that is responsible for stimulating APC/C catalytic activity by promoting UbcH10 binding. In contrast, Ube2S activity toward APC/C substrates is not dependent on the initiation-competent conformation of the APC/C.


    Organizational Affiliation

    Medical Research Council Laboratory of Molecular Biology, Cambridge CB2 0QH, United Kingdom; Section of Structural Biology, Chester Beatty Laboratories, Institute of Cancer Research, London SW3 6JB, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Anaphase-promoting complex subunit 1,Anaphase-promoting complex subunit 1,Anaphase-promoting complex subunit 1,Anaphase-promoting complex subunit 1
A
431Homo sapiensMutation(s): 0 
Gene Names: ANAPC1 (TSG24)
Find proteins for Q9H1A4 (Homo sapiens)
Go to Gene View: ANAPC1
Go to UniProtKB:  Q9H1A4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.179 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 82.633α = 90.00
b = 113.262β = 90.00
c = 100.436γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata reduction
Aimlessdata scaling
PHENIXrefinement

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Cancer Research UKUnited Kingdom--

Revision History 

  • Version 1.0: 2016-10-05
    Type: Initial release
  • Version 1.1: 2016-10-26
    Type: Database references, Source and taxonomy, Structure summary
  • Version 1.2: 2017-08-30
    Type: Advisory, Author supporting evidence