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Structure of an APC3–APC16 Complex: Insights into Assembly of the Anaphase-Promoting Complex/Cyclosome

Journal Article · · Journal of Molecular Biology
 [1];  [1];  [2];  [2];  [1];  [3];  [1];  [1];  [2];  [4]
  1. St. Jude Children's Research Hospital, Memphis, TN (United States). Dept. of Structural Biology
  2. Research Inst. of Molecular Pathology (IMP), Vienna (Austria). Vienna Biocenter (VBC)
  3. Howard Hughes Medical Inst., Memphis, TN (United States). St. Jude Children's Research Hospital
  4. St. Jude Children's Research Hospital, Memphis, TN (United States). Dept. of Structural Biology; Howard Hughes Medical Inst., Memphis, TN (United States). St. Jude Children's Research Hospital
The anaphase-promoting complex/cyclosome (APC/C) is a massive E3 ligase that controls mitosis by catalyzing ubiquitination of key cell cycle regulatory proteins. The APC/C assembly contains two subcomplexes: the “Platform” centers around a cullin-RING-like E3 ligase catalytic core; the “Arc Lamp” is a hub that mediates transient association with regulators and ubiquitination substrates. The Arc Lamp contains the small subunits APC16, CDC26, and APC13, and tetratricopeptide repeat (TPR) proteins (APC7, APC3, APC6, and APC8) that homodimerize and stack with quasi-2-fold symmetry. Within the APC/C complex, APC3 serves as center for regulation. APC3's TPR motifs recruit substrate-binding coactivators, CDC20 and CDH1, via their C-terminal conserved Ile-Arg (IR) tail sequences. Human APC3 also binds APC16 and APC7 and contains a > 200-residue loop that is heavily phosphorylated during mitosis, although the basis for APC3 interactions and whether loop phosphorylation is required for ubiquitination are unclear. Here, we map the basis for human APC3 assembly with APC16 and APC7, report crystal structures of APC3Δloop alone and in complex with the C-terminal domain of APC16, and test roles of APC3's loop and IR tail binding surfaces in APC/C-catalyzed ubiquitination. The structures show how one APC16 binds asymmetrically to the symmetric APC3 dimer and, together with biochemistry and prior data, explain how APC16 recruits APC7 to APC3, show how APC3's C-terminal domain is rearranged in the full APC/C assembly, and visualize residues in the IR tail binding cleft important for coactivator-dependent ubiquitination. Overall, the results provide insights into assembly, regulation, and interactions of TPR proteins and the APC/C.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1177429
Alternate ID(s):
OSTI ID: 1367766
Journal Information:
Journal of Molecular Biology, Journal Name: Journal of Molecular Biology Journal Issue: 8 Vol. 427; ISSN 0022-2836
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (12)

Atomic-Resolution Structures of the APC/C Subunits Apc4 and the Apc5 N-Terminal Domain journal October 2015
SUMO targets the APC/C to regulate transition from metaphase to anaphase journal March 2018
Visualizing the complex functions and mechanisms of the anaphase promoting complex/cyclosome (APC/C) journal November 2017
Insights into APC/C: from cellular function to diseases and therapeutics journal March 2016
Mechanisms for the temporal regulation of substrate ubiquitination by the anaphase-promoting complex/cyclosome journal December 2019
The Anaphase-Promoting Complex (APC) ubiquitin ligase affects chemosensory behavior inC. elegans journal May 2016
The anaphase‐promoting complex: A key mitotic regulator associated with somatic mutations occurring in cancer journal October 2019
Molecular mechanism of APC/C activation by mitotic phosphorylation journal April 2016
Plasmodium APC3 mediates chromosome condensation and cytokinesis during atypical mitosis in male gametogenesis journal April 2018
RING E3 mechanism for ubiquitin ligation to a disordered substrate visualized for human anaphase-promoting complex journal March 2015
Mechanism of APC/C CDC20 activation by mitotic phosphorylation journal April 2016
biGBac enables rapid gene assembly for the expression of large multisubunit protein complexes journal April 2016

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