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TRIM28/KAP1 promotes cell proliferation, tumor growth and metastasis of breast cancer cells and regulates the expression of multiple KRAB-ZNFs Joseph B.

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Presentation on theme: "TRIM28/KAP1 promotes cell proliferation, tumor growth and metastasis of breast cancer cells and regulates the expression of multiple KRAB-ZNFs Joseph B."— Presentation transcript:

1 TRIM28/KAP1 promotes cell proliferation, tumor growth and metastasis of breast cancer cells and regulates the expression of multiple KRAB-ZNFs Joseph B. Addison, Colton Koontz, James H. Fugett, Chad J. Creighton, Dongquan Chen, Mark K. Farrugia, Renata R. Padon, Maria A. Voronkova, Sarah L. McLaughlin, Ryan H. Livengood, Chen-Chung Lin, J. Michael Ruppert, Elena N. Pugacheva, and Alexey V. Ivanov Supplementary Figures

2 Figure S1. KRAB-ZNF proteins contain multiple copies of the zinc finger linker (ZnFL) motif. Alignment of linker sequences between zinc fingers from three randomly selected human KRAB-ZNF proteins. Each line contains two histidines (H) from the preceding zinc finger and two cysteines (C) from the following zinc finger shaded in grey. Highly conserved zinc finger linker TGEKPY residues are shaded in yellow.

3 Mouse Drosophila Zebrafish Xenopus Chicken Human Figure S2. Zinc finger linker conservation in different species. Logo representation of amino acid conservation in 28-aa zinc finger domains of C2H2-type ZNF proteins from different species. A high bit score reflects invariant residues C, C, H and H. 7-aa zinc finger linker sequence TGEKPYK/E is highly conserved. Red arrows show prevalence of R and F in chicken proteins.

4 Human cancer cell lines Ubc9 KAP1  -ZnFL Beas2B A549H460 H1395H1299 HMLE ZR75-1 MDA468 H358 NTera2 Jurkat K562 HepG2 Lung Breast Embryo BloodLiver kDa KAP1*SUMO Figure S3. Ubiquitous expression of KAP1 and ZNFs in human cancer cells lines. Western blot analysis of KAP1 and ZNFs in different human cancer cells lines of lung, breast, embryo, blood and liver origin. Ubc9 serves as loading control.

5 _________________________________________________________________ Dataset (# samples)Fold up TRIM28/KAP1P-value (tumor vs. normal) _________________________________________________________________ Radvanyi Breast (35 vs 9 normal) Invasive Ductal BC (32) Ductal BC in Situ (3) Sorlie Breast 2 (93 vs 4 normal) Ductal BC (93) Gluck Breast (154 vs 4 normal) Invasive BC (154) TCGA Breast array (518 vs 61 normal) Mucinous BC (4) Invasive BC (76) E-10 Invasive Ductal & Lobular BC (3) Invasive Lobular BC (36) E-5 Invasive Ductal BC (392) E-9 Mixed Lobular & Ductal BC (7) _________________________________________________________________ Figure S4. KAP1 is overexpressed in human breast cancer. Microarray analyses of Trim28/KAP1 expression in four different breast datasets from Oncomine.com.

6 [1] Herschkowitz JI, Simin K, Weigman VJ, Mikaelian I, Usary J, Hu Z, et al. Identification of conserved gene expression features between murine mammary carcinoma models and human breast tumors. Genome biology. 2007;8:R76 Normal Mesench. Basal Luminal Mixed Figure S5. KAP1 is overexpressed in mouse mammary tumors. Microarray analysis of Trim28/KAP1 expression in 108 tumors from 13 different mouse models of breast cancer. Normalized expression data were downloaded from [1] and plotted for Trim28/KAP1 on log2-transformed scale. Group assignments are from [1]. Group I represents normal mammary tissue.

7 Figure S6. KRAB-ZNFs and non-KRAB-ZNFs are overexpressed in breast tumors. Expression analysis of 343 KRAB-ZNF and 370 non-KRAB-ZNF genes in TCGA RNA-Seq (n=896) dataset from Supplementary File 1. For all genes P < 0.05, two-tailed t test.

8 N T N T N T N T N T T N N T N T N T N T N T N T N T T T : matched Breast tissue biopsy samples KAP1 non-spec. N – normal, T – tumor pairs Stage: IIIC IIA I IIB IIA IIIC IIIB IIA IIA IIIB IIA IIA IIIA IV kDa Figure S7. KAP1 protein is overexpressed in human breast tumors. Western blot analysis of KAP1 protein expression in biopsy samples of matched normal (N)–tumor (T) pairs obtained from the same patients. Stages of breast cancers are shown above. Non-specific band serves as loading control.

9 Figure S8. KAP1 SUMOylation level is increased in breast cancer cell lines. Percentage of SUMOylated KAP1 relative to total KAP1 protein level in each cell line based on densitometric quantification of protein bands from Fig. 3B. Data shown as mean ±SD. ns – non-significant, * - P < 0.05, ** - P < 0.01, two-tailed t test.

10 KAP1 RIPARIPA+NEMmIP Laemmli 80 kDa 115 Tubulin GAPDH KAP1*SUMO : buffers mIP – no SDS (0.5% NP-40, 0.5% Triton X-100) RIPA – 0.1% SDS Laemmli – 2% SDS Figure S9. KAP1 SUMO modification is preserved by N-ethylmaleimide (NEM) and SDS. Western blot analysis of KAP1 in MDA-MB-453 cells lysed in different buffer conditions (mIP – no SDS, RIPA – 0.1% SDS, Laemmli – 2% SDS). An inhibitor of de-SUMOylating enzymes, NEM was added to lysis buffer to final concentration 10  M. GAPDH and Tubulin serve as loading controls.

11 Knockdown (KD) Overexpression (OX) Figure S10. Extent of KAP1 knockdown and overexpression. RT-qPCR analysis of KAP1 mRNA in the indicated cell lines from Fig.4A and Fig.6. KAP1 mRNA levels for controls were assigned the relative value of 1. Data shown as mean ±SEM. In all cell lines KD and OX compared to control P < 0.001, two-tailed t test.

12 Schematic representation of KAP1 functional mutants Figure S11. Schematic representation of KAP1 functional mutants. A model for sumoylation-dependent, KAP1- mediated gene silencing. The SUMO-conjugated KAP1 recruits the NuRD complex and SETDB1 through SUMO interactions, which results in the deacetylation of histones and the methylation of histone H3-K9. KAP1-bound HP1 recognizes H3-K9 methylation. Point mutations (in red) were introduced in KAP1 at three separate regions which hinder specific KAP1 interactions. KAP1-R, KAP1-B2 and KAP1-C2 mutants are deficient in KRAB domain binding, KAP1-M2 mutant is deficient in interaction with HP1 and KAP1-K6R mutant is deficient in SUMOylation. Small triangle, acetyl mark; small circle, H3-K9 trimethyl mark on histone tails. C2 M2 K6R KAP1 functional point mutants R B2

13 MEF Kap1 -/- dose KAP1  -ZnFL KAP1 kDa VectorKAP1-WTKAP1-RKAP1-B2 KAP1- M2-K6R GAPDH KAP1-C2 Figure S12. Expression of KRAB-ZNF proteins depends on their ability to interact with KAP1. WB analysis of KAP1 and KRAB-ZNFs in Kap1 -/- MEFs transfected with vector, wild type KAP1 and the indicated KAP1 mutants. Increasing doses of KAP1 expression constructs were used as shown. GAPDH serves as loading controls. WT – wild type KAP1. R, B2 and C2 are three KAP1 RBCC domain mutants defective in interaction with the KRAB domain. R mutant - RING domain mutation CC65,68AA; B2 mutant - Box2 domain mutation C209A,H212A and C2 mutant - coiled-coil mutation L306P (ref. 40). M2-K6R double mutant is defective in HP1 interaction and SUMOylation (both required for transcriptional repression) but capable of binding to the KRAB domain.

14 Fig. S13. KAP1 knockdown in MDA-MB-231LN cells inhibits primary tumor growth in orthotopic xenograft mouse model. Tumor growth curves of orthotopically injected MDA-MB-231LN cells: shControl (n=6), shKAP1-3 (n=5), shKAP1-4 (n=5). Data shown as mean + SEM, * - P < 0.05, ** - P < 0.01, two-tailed Student’s t test.


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