XB-ART-57062
F1000Res
2019 Jan 01;8. doi: 10.12688/f1000research.18582.1.
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APC/C: current understanding and future perspectives.
Yamano H
.
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The separation of sister chromatids at anaphase, which is regulated by an E3 ubiquitin ligase called the anaphase-promoting complex/cyclosome (APC/C), is arguably the most important irrevocable event during the cell cycle. The APC/C and cyclin-dependent kinase 1 (Cdk1) are just two of the many significant cell cycle regulators and exert control through ubiquitylation and phosphorylation, respectively. The temporal and spatial regulation of the APC/C is achieved by multiple mechanisms, including phosphorylation, interaction with the structurally related co-activators Cdc20 and Cdh1, loading of distinct E2 ubiquitin-conjugating enzymes, binding with inhibitors and differential affinities for various substrates. Since the discovery of APC/C 25 years ago, intensive studies have uncovered many aspects of APC/C regulation, but we are still far from a full understanding of this important cellular machinery. Recent high-resolution cryogenic electron microscopy analysis and reconstitution of the APC/C have greatly advanced our understanding of molecular mechanisms underpinning the enzymatic properties of APC/C. In this review, we will examine the historical background and current understanding of APC/C regulation.
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Wellcome Trust , Biotechnology and Biological Sciences Research Council , Medical Research Council , Cancer Research UK, 13586 Cancer Research UK, MR/M010899/1 Medical Research Council
Species referenced: Xenopus
Genes referenced: cdc20 cdh1 cdk1 fbxo5 mcc slc25a24 tpr ube2s
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Figure 1. . Schematic diagrams of RING E3 ubiquitin ligases.RING-type E3 ligases serve as scaffolds to bring together the E2~Ub conjugate and the substrate. E3s play a role in stimulating Ub transfer to the substrate from E2~Ub conjugate. E2-binding RING domain is coloured in light blue. ( A) Monomeric RING E3 ubiquitin ligases (for example, c-Cbl). ( B) A simplified cartoon view of APC/C RING E3 ubiquitin ligase with a co-activator such as Cdc20 and Cdh1. ( C) The APC/C is a multi-subunit cullin-RING E3 ubiquitin ligase that uses two E2s. APC/C, anaphase-promoting complex/cyclosome. |
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Figure 2. . APC/C structure and overall organisation.( A) APC/C structure. The image was generated by using the Protein Data Bank file (4UI9). The indicated numbers represent APC/C subunits. ( B) Schematic view of the APC/C structure based on ( A). Left: APC Cdc20; right: APC/C Cdh1. Cdc20 activates the APC/C in metaphase and anaphase to degrade substrates such as cyclin B and securin and then Cdh1 takes over to degrade APC/C substrates in late anaphase and G 1. ( C) The APC/C complex can be divided into three modules: the catalytic module (Apc2-Apc11) that interacts with E2s, the substrate recognition TPR lobe and the scaffolding platform (Apc1-Apc4-Apc5). During the ubiquitylation catalysis, both substrate and E2s are positioned in or near the APC/C central cavity. APC/C, anaphase-promoting complex/cyclosome; TPR, tetratricopeptide repeat. |
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Figure 3. . Phosphorylation-dependent activation of the APC/C for APC/C Cdc20.Interphase APC/C is inactive without the recruitment of Cdc20, which is presented from a front view and a back view of the APC/C. The disordered loop domain of Apc1 (Apc1-loop 300), which is located in the N-terminal WD40 domain, blocks Cdc20-NTD access to the APC/C, in particular the C-boxâbinding sites on Apc8B. Yellow dotted circle highlights the C-boxâbinding site. In mitosis, Cdk1-cyclinB-Cks phosphorylates the disordered loop domain of Apc3 (Apc3 loop), which allows Cks-bound Cdk1-cyclin B loading to Apc3 loop. Cdk1-cyclinB-Cks then stimulates phosphorylation of Apc1-loop 300 as an intramolecular phosphorylation relay. Upon phosphorylation, inhibitory domain Apc1-loop 300 is dislocated from the C-boxâbinding site, allowing Cdc20 association, the C-box-dependent activation and subsequent ubiquitylation catalysis (âcartoon view of the APC/Câ). The isoleucine-arginine (IR) tail of Cdc20 binds to Apc3 and the C-box interacts with Apc8B for activation of the APC/C. Both IR tail binding and C-box binding ensure stable binding of co-activator (Cdc20) to the APC/C. The WD40 domain of co-activator is responsible for substrate degron recognition. The RING subunit Apc11 is coloured in light blue. APC/C, anaphase-promoting complex/cyclosome. |
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Figure 4. . APC/C inhibitors target the APC/C at multiple levels.( A) Overexpression or high dose of the destruction box (D-box) fragment (+op-D-box) competes with substrates to bind to the D-boxâbinding pocket on the WD40 domain (competitive inhibition). A small-molecule Apcin binds the D-boxâbinding pocket on the side face of the WD40 domain (+Apcin). ( B) A small-molecule tosyl- l-arginine methyl ester (TAME), which resembles the isoleucine-arginine (IR) tail of Cdc20 and Cdh1, binds APC3 to interfere with the IR tailâbinding site (+TAME). EM study suggests that TAME might compete with Cdc20 to bind at the IR tail and the C-boxâbinding sites. ( C) Emi1 inhibits the APC/C at multiple levels (+Emi1). The D-box (weak) binds the WD40 domain of Cdc20/Cdh1, a zinc-binding region (ZBR) interferes with Ubc2C-dependent APC/C activity and the C-terminal LRRL tail interferes with Ube2S binding to the APC/C. The LRRL tail sequence of Emi1 is identical to the LRRL motif of Ube2S. In vivo target of Emi1 is Cdh1. ( D) The main effector of the spindle assembly checkpoint (SAC) is the mitotic checkpoint complex (MCC), which inhibits the APC/C at multiple levels. In vivo target of MCC is Cdc20. MCC binds both the D-boxâbinding pocket and the KEN-boxâbinding surface of the WD40 domain and blocks WD40-mediated substrate binding. MCC also blocks Ube2C-dependent APC/C activity at the closed MCC configuration; however, Ube2S-dependent APC/C activity is not inhibited by MCC. Schematic diagrams are based on the cartoon view of the APC/C in Figure 3 (bottom left). APC/C, anaphase-promoting complex/cyclosome. |
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