Volume 30, Issue 2, Pages (July 2014)

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Volume 30, Issue 2, Pages 238-245 (July 2014) SAS-6 Assembly Templated by the Lumen of Cartwheel-less Centrioles Precedes Centriole Duplication  Chii Shyang Fong, Minhee Kim, T. Tony Yang, Jung-Chi Liao, Meng-Fu Bryan Tsou  Developmental Cell  Volume 30, Issue 2, Pages 238-245 (July 2014) DOI: 10.1016/j.devcel.2014.05.008 Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 1 SAS-6 Is Transiently Recruited to the Proximal Lumen of Mother Centrioles in Early S-Phase (A) U2OS cells in S phase were processed for immunofluorescence to visualize centriole (centrin-2) and SAS-6. (B) Quantification of cells with weak SAS-6 foci in S phase. Error bars represent SD; n > 80, N = 3. (C) Quantification of weak SAS-6 foci in late S phase. n > 100, N = 3. (D) Weak SAS-6 localizes to the proximal end of mother centrioles. Linear alignment of centrin-2 (distal-end component) and C-Nap1 (proximal end) is marked by a white line. Here, rabbit antibodies recognizing the C terminus of C-Nap1 were used with a mouse anti-SAS-6 antibody. m, mother; d, daughter. (E) 3D-SIM image of luminal components CPAP and centrin-2 in comparison to nonluminal component C-Nap1. Here, a mouse antibody recognizing the N terminus of C-Nap1 was used with a rabbit anti-CPAP antibody. Imaris 3D rendering is presented as indicated. (F) 3D-SIM images of SAS-6, C-Nap1, and centrin in S-phase centrioles stained with the antibodies indicated. m, mother. All S-phase cells shown in (A), (B), (C), (D), and (F) were identified with BrdU labeling (see Experimental Procedures), not shown. Developmental Cell 2014 30, 238-245DOI: (10.1016/j.devcel.2014.05.008) Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 2 G1 Centrioles Can Recruit and Organize SAS-6 into an Ordered Structure Similar to the Cartwheel (A) RPE-1 cells arrested in G1 for 48 hr followed by expression of HA-tagged SAS-6ND were imaged with 3D-SIM. n > 45, N = 3. (B) G1-arrested RPE-1 cells expressing SAS-6ND as described in (A) were released into S phase by serum reintroduction and stained with the indicated antibodies. S-phase cells were identified by BrdU labeling, not shown. n > 21, N = 3. (C) Schematic diagram of domain organization of SAS-6 and the epitopes recognized by the antibodies used in STED analyses. (D) Representative STED images of SAS-6 staining with anti-C-term antibody on normal S-phase centrioles were shown. Graph presents STED measurements of ring/focus diameter by averaging the long and short axes. Actual size of the structure is estimated by subtracting STED resolution from STED measurements as indicated. Error bar represents SD; n = 40. (E) Frequency of observing C-Nap1 ring under 3D-SIM. n = 46. (F) STED imaging of SAS-6ND stained with anti-C-term and anti-N-term antibodies. Actual size of the structure is estimated as indicated. Error bars represent SD; n as indicated. (G) SAS-6F131E localizes to the proximal lumen of G1 centrioles. 3D-SIM image of G1-arrested RPE-1 cells inducibly expressing HA-tagged SAS-6F131E as described in (A). n > 39, N = 3. (H) STED imaging of SAS-6F131E stained with anti-C-term and anti-N-term antibodies. Actual size of the structure is estimated as indicated. Error bars represent SD; n as indicated. Developmental Cell 2014 30, 238-245DOI: (10.1016/j.devcel.2014.05.008) Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 3 Molecular Requirements for SAS-6 Recruitment to and Release from Centriole Lumen (A) Collections of various SAS-6 deletion mutants tagged with HA (red). Centriolar localizations of these mutants are summarized. (B and C) Localization and expression of SAS-6 mutants. Indicated SAS-6 mutants were inducibly expressed in G1-arrested RPE-1 cells, and their luminal localizations were examined. (D) HeLa cells depleted of CPAP (two sequential RNAi for 6 days) were induced to express SAS-6ND. Centrioles in G1 or S-phase cells were examined for SAS-6 localization as indicated. Similar results were obtained with three independent siRNA oligos (see Experimental Procedures). Error bars represent SD; n > 38, N = 3. The significance (two-tailed t test) is indicated, ∗∗∗p < 0.0001. (E) U2OS cells depleted of the indicated protein were examined for the localization of the endogenous SAS-6 during S phase. n > 31, N = 2. (F) U2OS cells depleted of PLK4 or STIL were examined for the localization of the endogenous SAS-6 during S phase by 3D-SIM. Error bars represent SD; n > 26, N = 3. (G) U2OS cells depleted of PLK4 were induced to express SAS-6ND. The duplication status and localization of the elevated SAS-6ND were examined and quantified in S-phase cells by 3D-SIM with indicated antibodies. Note that duplication was not rescued, and S-phase cells containing unduplicated centrioles (centrin singlet) were counted. n > 25, N = 3. (H) Wild-type, early S-phase U2OS cells containing one bright and one weak SAS-6 foci were examined for the localization of STIL. Note that STIL only associates with the bright SAS-6 focus. (I) STIL localization in control or PLK4-depleted U2OS cells expressing SAS-6ND was examined. n > 29, N = 3. (J) Immunoblots showing STIL level is unaffected by PLK4 knockdown. (K and L) SAS-6F131E was inducibly expressed in U2OS cells depleted of the endogenous SAS-6. Localizations of SAS-6F131E (K) and STIL (L) were then examined in S-phase cells by 3D-SIM and regular microscopy, respectively, as indicated. n > 24, N = 3. S-phase cells shown in (D), (E), (F), (G), (I), (K), and (L) were identified with BrdU labeling, not shown. See also Figure S1. Developmental Cell 2014 30, 238-245DOI: (10.1016/j.devcel.2014.05.008) Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 4 Engaged Centrioles Block Luminal Recruitment of SAS-6 (A) Schematic outlining the generation of G1 cells with engaged centrioles as described previously (Tsou et al., 2009; Wang et al., 2011). SAS-6ND expression was induced in proliferating cells for 16 hr before adding BI-2536 to inhibit Plk1. Mitotic arrested cells were forced to exit mitosis 5 hr after Plk1 inhibition by Cdk1 inhibitor RO-3306 for 5 hr. Multinuclei cells, which were cells that had gone through mitosis in the absence of Plk1 activity, were examined for the centriolar localization of SAS-6 with indicated antibodies. n > 26, N = 3. (B) SAS-6 recruitment to mother centriole lumen is inhibited by engaged centrioles. Immunofluorescence image of a G1 cell containing engaged centrioles with indicated antibodies. (C) Model for a template-based mechanism of centriole duplication. SAS-6 dimers are individually recruited to the proximal lumen of mother centrioles, where they are organized by the surrounding geometry to undergo 9-fold symmetrical assembly. The assembled SAS-6 oligomer is then released from the lumen and forms the cartwheel that drives daughter centriole formation. Centriole engagement blocks rerecruitment of SAS-6 to the mother centriole lumen and thus prevents centriole reduplication. Centriole disengagement and cartwheel removal at the end of mitosis allow the centrioles to be used as a template for their own biogenesis. Mother centriole (gray), daughter centriole (green), CPAP (blue), and SAS-6 (red). Developmental Cell 2014 30, 238-245DOI: (10.1016/j.devcel.2014.05.008) Copyright © 2014 Elsevier Inc. Terms and Conditions