1
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Hu B, Yin G, Sun X. Identification of specific role of SNX family in gastric cancer prognosis evaluation. Sci Rep 2022; 12:10231. [PMID: 35715463 PMCID: PMC9205943 DOI: 10.1038/s41598-022-14266-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Accepted: 06/03/2022] [Indexed: 11/10/2022] Open
Abstract
We here perform a systematic bioinformatic analysis to uncover the role of sorting nexin (SNX) family in clinical outcome of gastric cancer (GC). Comprehensive bioinformatic analysis were realized with online tools such as TCGA, GEO, String, Timer, cBioportal and Kaplan-Meier Plotter. Statistical analysis was conducted with R language or Perl, and artificial neural network (ANN) model was established using Python. Our analysis demonstrated that SNX4/5/6/7/8/10/13/14/15/16/20/22/25/27/30 were higher expressed in GC, whereas SNX1/17/21/24/33 were in the opposite expression profiles. GSE66229 was employed as verification of the differential expression analysis based on TCGA. Clustering results gave the relative transcriptional levels of 30 SNXs in tumor, and it was totally consistent to the inner relevance of SNXs at mRNA level. Protein-Protein Interaction map showed closely and complex connection among 33 SNXs. Tumor immune infiltration analysis asserted that SNX1/3/9/18/19/21/29/33, SNX1/17/18/20/21/29/31/33, SNX1/2/3/6/10/18/29/33, and SNX1/2/6/10/17/18/20/29 were strongly correlated with four kinds of survival related tumor-infiltrating immune cells, including cancer associated fibroblast, endothelial cells, macrophages and Tregs. Kaplan-Meier survival analysis based on GEO presented more satisfactory results than that based on TCGA-STAD did, and all the 29 SNXs were statistically significant, SNX23/26/28 excluded. SNXs alteration contributed to microsatellite instability (MSI) or higher level of MSI-H (hyper-mutated MSI or high level of MSI), and other malignancy encompassing mutation of TP53 and ARID1A, as well as methylation of MLH1.The multivariate cox model, visualized as a nomogram, performed excellently in patients risk classification, for those with higher risk-score suffered from shorter overall survival (OS). Compared to previous researches, our ANN models showed a predictive power at a middle-upper level, with AUC of 0.87/0.72, 0.84/0.72, 0.90/0.71 (GSE84437), 0.98/0.66, 0.86/0.70, 0.98/0.71 (GSE66229), 0.94/0.66, 0.83/0.71, 0.88/0.72 (GSE26253) corresponding to one-, three- and five-year OS and recurrence free survival (RFS) estimation, especially ANN model built with GSE66229 including exclusively SNXs as input data. The SNX family shows great value in postoperative survival evaluation of GC, and ANN models constructed using SNXs transcriptional data manifesting excellent predictive power in both OS and RFS prediction works as convincing verification to that.
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Affiliation(s)
- Beibei Hu
- Department of Gastroenterology, First Affiliated Hospital of China Medical University, North Nanjing Street 155, Shenyang, 110001, People's Republic of China
| | - Guohui Yin
- School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin, 300401, People's Republic of China
| | - Xuren Sun
- Department of Gastroenterology, First Affiliated Hospital of China Medical University, North Nanjing Street 155, Shenyang, 110001, People's Republic of China.
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2
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Zimmermann RC, Sardiu ME, Manton CA, Miah MS, Banks CAS, Adams MK, Koestler DC, Hurst DR, Edmonds MD, Washburn MP, Welch DR. Perturbation of BRMS1 interactome reveals pathways that impact metastasis. PLoS One 2021; 16:e0259128. [PMID: 34788285 PMCID: PMC8598058 DOI: 10.1371/journal.pone.0259128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 10/12/2021] [Indexed: 11/25/2022] Open
Abstract
Breast Cancer Metastasis Suppressor 1 (BRMS1) expression is associated with longer patient survival in multiple cancer types. Understanding BRMS1 functionality will provide insights into both mechanism of action and will enhance potential therapeutic development. In this study, we confirmed that the C-terminus of BRMS1 is critical for metastasis suppression and hypothesized that critical protein interactions in this region would explain its function. Phosphorylation status at S237 regulates BRMS1 protein interactions related to a variety of biological processes, phenotypes [cell cycle (e.g., CDKN2A), DNA repair (e.g., BRCA1)], and metastasis [(e.g., TCF2 and POLE2)]. Presence of S237 also directly decreased MDA-MB-231 breast carcinoma migration in vitro and metastases in vivo. The results add significantly to our understanding of how BRMS1 interactions with Sin3/HDAC complexes regulate metastasis and expand insights into BRMS1's molecular role, as they demonstrate BRMS1 C-terminus involvement in distinct protein-protein interactions.
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Affiliation(s)
- Rosalyn C. Zimmermann
- Department of Cancer Biology, The Kansas University Medical Center, Kansas City, KS, United States of America
| | - Mihaela E. Sardiu
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
- Department of Biostatistics and Data Science, The Kansas University Medical Center, Kansas City, KS, United States of America
- The University of Kansas Cancer Center, Kansas City, KS, United States of America
| | - Christa A. Manton
- Department of Cancer Biology, The Kansas University Medical Center, Kansas City, KS, United States of America
- Pathology Department, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
- Department of Biology, Baker University, Baldwin City, KS, United States of America
| | - Md. Sayem Miah
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
- Department of Biochemistry and Molecular Biology, University of Arkansas for Health Sciences, Little Rock, AR, United States of America
| | - Charles A. S. Banks
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
| | - Mark K. Adams
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
| | - Devin C. Koestler
- Department of Biostatistics and Data Science, The Kansas University Medical Center, Kansas City, KS, United States of America
- The University of Kansas Cancer Center, Kansas City, KS, United States of America
| | - Douglas R. Hurst
- Pathology Department, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Mick D. Edmonds
- Department of Genetics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Michael P. Washburn
- Department of Cancer Biology, The Kansas University Medical Center, Kansas City, KS, United States of America
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
- The University of Kansas Cancer Center, Kansas City, KS, United States of America
| | - Danny R. Welch
- Department of Cancer Biology, The Kansas University Medical Center, Kansas City, KS, United States of America
- The University of Kansas Cancer Center, Kansas City, KS, United States of America
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3
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Ghosh C, Xing Y, Li S, Hoyle RG, Sun M, Li J, Sun Y. Sorting nexin 6 interacts with Cullin3 and regulates programmed death ligand 1 expression. FEBS Lett 2021; 595:2558-2569. [PMID: 34510437 DOI: 10.1002/1873-3468.14191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Revised: 08/20/2021] [Accepted: 08/31/2021] [Indexed: 11/06/2022]
Abstract
Programmed death ligand 1 (PD-L1) is critical for the ability of cancer cells to evade attacks by the host immune system. However, the molecular mechanisms controlling PD-L1 expression have not been fully understood. Here, we demonstrate that sorting nexin 6 (SNX6) is a novel regulator of PD-L1 expression. Knockdown of SNX6 in cancer cells significantly decreases PD-L1 protein levels. In contrast, loss of SNX6 does not reduce PD-L1 mRNA levels. Instead, SNX6 interacts with Cullin3, an E3 ubiquitin ligase responsible for PD-L1 ubiquitination and subsequent degradation. By binding with Cullin3, SNX6 decreases the interaction between the adaptor protein speckle-type POZ protein and Cullin3, which in turn downregulates Cullin3-mediated PD-L1 ubiquitination. This research reveals a novel molecular nexus in modulating PD-L1.
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Affiliation(s)
- Chinmoy Ghosh
- Department of Oral and Craniofacial Molecular Biology, Philips Institute for Oral Health Research, School of Dentistry, Virginia Commonwealth University, Richmond, VA, USA
| | - Yanli Xing
- Department of Otolaryngology, Shanghai Pudong New Area Gongli Hospital, Shanghai, China
| | - Suhua Li
- Department of Oral and Craniofacial Molecular Biology, Philips Institute for Oral Health Research, School of Dentistry, Virginia Commonwealth University, Richmond, VA, USA
| | - Rosalie G Hoyle
- Department of Medicinal Chemistry, Institute for Structural Biology, Drug Discovery and Development, School of Pharmacy, Virginia Commonwealth University, Richmond, VA, USA
| | - Ming Sun
- Department of Oral and Craniofacial Molecular Biology, Philips Institute for Oral Health Research, School of Dentistry, Virginia Commonwealth University, Richmond, VA, USA
| | - Jiong Li
- Department of Medicinal Chemistry, Institute for Structural Biology, Drug Discovery and Development, School of Pharmacy, Virginia Commonwealth University, Richmond, VA, USA.,Massey Cancer Center, Virginia Commonwealth University, Richmond, VA, USA
| | - Yue Sun
- Department of Oral and Craniofacial Molecular Biology, Philips Institute for Oral Health Research, School of Dentistry, Virginia Commonwealth University, Richmond, VA, USA.,Massey Cancer Center, Virginia Commonwealth University, Richmond, VA, USA
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4
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Pan B, Liu L, Hu X, Sun X, Zhu Y, Zhang T, Wei D, Guo Y, Shan J. Promotion of esophageal adenocarcinoma metastasis via Wnt/ß-catenin signal pathway by sorting nexins 3. J Gastroenterol Hepatol 2020; 35:2131-2139. [PMID: 32187731 DOI: 10.1111/jgh.15039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 03/13/2020] [Accepted: 03/15/2020] [Indexed: 12/21/2022]
Abstract
BACKGROUND Esophageal adenocarcinoma is often associated with late diagnoses, poor prognoses, significant morbidities, and high mortality rates. Aberrant expression of Wnt/β-catenin signal pathways were observed in the tumorigenesis and metastasis of esophageal adenocarcinoma. Sorting nexins 3 has been shown to participate in Wnt protein sorting and regulate Wnt/β-catenin signal transduction. Thus, we studied the role and molecular mechanism of sorting nexins 3 in esophageal adenocarcinoma. METHODS Tissue microassay were used to analyze the expression of sorting nexins 3 in esophageal adenocarcinoma tissue and its relationship with survival rate. Using in vivo and in vitro models, we further investigated the effect of sorting nexins 3 on tumor growth and metastasis and underling mechanism. RESULTS Immunohistochemical staining of human esophageal adenocarcinoma tissue microassay revealed an increased sorting nexins 3 level in esophageal adenocarcinoma tissue and high expression of sorting nexins 3 correlated with the poor prognosis. In vitro study showed that sorting nexins 3 knockdown suppressed esophageal adenocarcinoma cell invasion, metastasis, and epithelial-mesenchymal translation (EMT) process, and this result was confirmed by in vivo tumor metastasis assays. Moreover, we further proved that sorting nexins 3 affected cell invasion and EMT through Wnt/β-catenin signal pathway. CONCLUSION Our data provided strong evidence that sorting nexins 3 played a critical role in esophageal adenocarcinoma metastasis through Wnt/β-catenin signal pathway.
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Affiliation(s)
- Biran Pan
- Medical Research Center, The Third People's Hospital of Chengdu, The Second Chengdu Hospital Affiliated to Chongqing Medical University, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, Sichuan, China.,Assisted Reproductive Center, The Maternal and Child Health Hospital of Qinzhou, Qinzhou, China
| | - Lei Liu
- Medical Research Center, The Third People's Hospital of Chengdu, The Second Chengdu Hospital Affiliated to Chongqing Medical University, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, Sichuan, China
| | - Xia Hu
- Department of Gastroenterology, The Third People's Hospital of Chengdu, The Second Chengdu Hospital Affiliated to Chongqing Medical University, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, China
| | - Xiaobin Sun
- Department of Gastroenterology, The Third People's Hospital of Chengdu, The Second Chengdu Hospital Affiliated to Chongqing Medical University, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, China
| | - Yifang Zhu
- Medical Research Center, The Third People's Hospital of Chengdu, The Second Chengdu Hospital Affiliated to Chongqing Medical University, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, Sichuan, China
| | - Tongtong Zhang
- Medical Research Center, The Third People's Hospital of Chengdu, The Second Chengdu Hospital Affiliated to Chongqing Medical University, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, Sichuan, China
| | - Danfeng Wei
- Medical Research Center, The Third People's Hospital of Chengdu, The Second Chengdu Hospital Affiliated to Chongqing Medical University, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, Sichuan, China
| | - Yuanbiao Guo
- Medical Research Center, The Third People's Hospital of Chengdu, The Second Chengdu Hospital Affiliated to Chongqing Medical University, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, Sichuan, China
| | - Jing Shan
- Department of Gastroenterology, The Third People's Hospital of Chengdu, The Second Chengdu Hospital Affiliated to Chongqing Medical University, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, China
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5
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Yang L, Tan W, Yang X, You Y, Wang J, Wen G, Zhong J. Sorting nexins: A novel promising therapy target for cancerous/neoplastic diseases. J Cell Physiol 2020; 236:3317-3335. [PMID: 33090492 DOI: 10.1002/jcp.30093] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 09/18/2020] [Accepted: 09/22/2020] [Indexed: 12/17/2022]
Abstract
Sorting nexins (SNXs) are a diverse group of cytoplasmic- and membrane-associated phosphoinositide-binding proteins containing the PX domain proteins. The function of SNX proteins in regulating intracellular protein trafficking consists of endocytosis, endosomal sorting, and endosomal signaling. Dysfunctions of SNX proteins are demonstrated to be involved in several cancerous/neoplastic diseases. Here, we review the accumulated evidence of the molecular structure and biological function of SNX proteins and discuss the regulatory role of SNX proteins in distinct cancerous/neoplastic diseases. SNX family proteins may be a valuable potential biomarker and therapeutic strategy for diagnostics and treatment of cancerous/neoplastic diseases.
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Affiliation(s)
- Lu Yang
- Hunan Province Key Laboratory of Tumor Cellular & Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, Hunan, China
- Institute of Clinical Medicine, the First Affiliated Hospital of University of South China, Hengyang, Hunan, China
| | - Weihua Tan
- Institute of Clinical Medicine, the First Affiliated Hospital of University of South China, Hengyang, Hunan, China
- Emergency Department, the First Affiliated Hospital of University of South China, Hengyang, Hunan, China
| | - Xinzhi Yang
- Hunan Province Key Laboratory of Tumor Cellular & Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, Hunan, China
- Institute of Clinical Medicine, the First Affiliated Hospital of University of South China, Hengyang, Hunan, China
| | - Yong You
- Research Lab of Translational Medicine, Hengyang Medical College, University of South China, Hengyang, Hunan, China
| | - Jing Wang
- Research Lab of Translational Medicine, Hengyang Medical College, University of South China, Hengyang, Hunan, China
| | - Gebo Wen
- Hunan Province Key Laboratory of Tumor Cellular & Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, Hunan, China
- Institute of Clinical Medicine, the First Affiliated Hospital of University of South China, Hengyang, Hunan, China
| | - Jing Zhong
- Hunan Province Key Laboratory of Tumor Cellular & Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, Hunan, China
- Institute of Clinical Medicine, the First Affiliated Hospital of University of South China, Hengyang, Hunan, China
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6
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Identifying Methylation Pattern and Genes Associated with Breast Cancer Subtypes. Int J Mol Sci 2019; 20:ijms20174269. [PMID: 31480430 PMCID: PMC6747348 DOI: 10.3390/ijms20174269] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 08/19/2019] [Accepted: 08/29/2019] [Indexed: 12/18/2022] Open
Abstract
Breast cancer is regarded worldwide as a severe human disease. Various genetic variations, including hereditary and somatic mutations, contribute to the initiation and progression of this disease. The diagnostic parameters of breast cancer are not limited to the conventional protein content and can include newly discovered genetic variants and even genetic modification patterns such as methylation and microRNA. In addition, breast cancer detection extends to detailed breast cancer stratifications to provide subtype-specific indications for further personalized treatment. One genome-wide expression–methylation quantitative trait loci analysis confirmed that different breast cancer subtypes have various methylation patterns. However, recognizing clinically applied (methylation) biomarkers is difficult due to the large number of differentially methylated genes. In this study, we attempted to re-screen a small group of functional biomarkers for the identification and distinction of different breast cancer subtypes with advanced machine learning methods. The findings may contribute to biomarker identification for different breast cancer subtypes and provide a new perspective for differential pathogenesis in breast cancer subtypes.
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7
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Pantoja-Uceda D, Neira JL, Contreras LM, Manton CA, Welch DR, Rizzuti B. The isolated C-terminal nuclear localization sequence of the breast cancer metastasis suppressor 1 is disordered. Arch Biochem Biophys 2019; 664:95-101. [PMID: 30707944 DOI: 10.1016/j.abb.2019.01.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 01/26/2019] [Accepted: 01/28/2019] [Indexed: 02/02/2023]
Abstract
BRMS1 is a 246-residue-long protein belonging to the family of metastasis suppressors. It is a predominantly nuclear protein, although it can also function in the cytoplasm. At its C terminus, it has a region that is predicted to be a nuclear localization sequence (NLS); this region, NLS2, is necessary for metastasis suppression. We have studied in vitro and in silico the conformational preferences in aqueous solution of a peptide (NLS2-pep) that comprises the NLS2 of BRMS1, to test whether it has a preferred conformation that could be responsible for its function. Our spectroscopic (far-UV circular dichroism, DOSY-NMR and 2D-NMR) and computational (all-atom molecular dynamics) results indicate that NLS2-pep was disordered in aqueous solution. Furthermore, it did not acquire a structure even when experiments were performed in a more hydrophobic environment, such as the one provided by 2,2,2-trifluoroethanol (TFE). The hydrodynamic radius of the peptide in water was identical to that of a random-coil sequence, in agreement with both our molecular simulations and other theoretical predictions. Thus, we suggest that NLS2 is a disordered region, with non pre-formed structure, that participates in metastasis suppression.
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Affiliation(s)
| | - José L Neira
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, 03202, Elche, Alicante, Spain; Instituto de Biocomputación y Física de Sistemas Complejos, Joint Units IQFR-CSIC-BIFI, and GBSC-CSIC-BIFI, Universidad de Zaragoza, 50009, Zaragoza, Spain.
| | - Lellys M Contreras
- Center for Environmental Biology and Chemistry Research, Facultad Experimental de Ciencias y Tecnología, Universidad de Carabobo, 2001, Valencia, Venezuela
| | - Christa A Manton
- Department of Cancer Biology, The University of Kansas Medical Center, Kansas City, KS, 66160, USA
| | - Danny R Welch
- Department of Cancer Biology, The University of Kansas Medical Center, Kansas City, KS, 66160, USA; The University of Kansas Cancer Center, Kansas City, KS, 66160, USA
| | - Bruno Rizzuti
- CNR-NANOTEC, Licryl-UOS Cosenza and CEMIF.Cal, Department of Physics, University of Calabria, 87036, Rende, Italy.
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8
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Hu P, Liang Y, Hu Q, Wang H, Cai Z, He J, Cai J, Liu M, Qin Y, Yu X, Jiang C, Zhang B, Wang W. SNX6 predicts poor prognosis and contributes to the metastasis of pancreatic cancer cells via activating epithelial-mesenchymal transition. Acta Biochim Biophys Sin (Shanghai) 2018; 50:1075-1084. [PMID: 30307473 DOI: 10.1093/abbs/gmy110] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Accepted: 08/11/2018] [Indexed: 01/06/2023] Open
Abstract
Pancreatic cancer remains a challenging disease with an overall cumulative 5-year survival rate around 6%. Though significant progress has been made in the availability of diagnostic techniques and treatment strategies, pancreatic cancer remains a disease of high mortality rate. Therefore, there is an urgent need for a better understanding of the molecular mechanisms that governs the oncogenesis and metastasis process of pancreatic cancer. In the present study, by using the Cancer Genome Atlas (TCGA) dataset analysis, we demonstrated that sorting nexin 6 (SNX6) serves as a biomarker for predicting prognosis of pancreatic cancer. In vitro studies demonstrated that silencing of SNX6 expression reduced cell proliferation, colony formation, invasion, and metastasis. Higher level of SNX6 helps maintain the mesenchymal properties, which renders migration and invasive capacities to pancreatic cancer cells. Moreover, in the process of TGF-β-induced epithelial to mesenchymal transition (EMT), the expression level of SNX6 was increased, and silencing of SNX6 expression could inhibit the TGF-β-induced EMT program. These results collectively uncovered a novel predictive marker for pancreatic cancer and provided the possible underlying molecular mechanism.
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Affiliation(s)
- Pengfei Hu
- Department of General Surgery, Huadong Hospital, Fudan University, Shanghai, China
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Shanghai, China
| | - Yun Liang
- Department of General Surgery, Huadong Hospital, Fudan University, Shanghai, China
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Shanghai, China
| | - Qiangsheng Hu
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Hongwei Wang
- Department of General Surgery, Huadong Hospital, Fudan University, Shanghai, China
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Shanghai, China
| | - Zhiwei Cai
- Department of General Surgery, Huadong Hospital, Fudan University, Shanghai, China
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Shanghai, China
| | - Jiaqi He
- Department of General Surgery, Huadong Hospital, Fudan University, Shanghai, China
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Shanghai, China
| | - Jianhua Cai
- Department of General Surgery, Huadong Hospital, Fudan University, Shanghai, China
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Shanghai, China
| | - Meng Liu
- Department of General Surgery, Huadong Hospital, Fudan University, Shanghai, China
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Shanghai, China
| | - Yi Qin
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Xianjun Yu
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Chongyi Jiang
- Department of General Surgery, Huadong Hospital, Fudan University, Shanghai, China
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Shanghai, China
| | - Bo Zhang
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Wei Wang
- Department of General Surgery, Huadong Hospital, Fudan University, Shanghai, China
- Shanghai Pancreatic Cancer Institute, Shanghai, China
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Shanghai, China
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9
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Jitsukawa S, Kamekura R, Kawata K, Ito F, Sato A, Matsumiya H, Nagaya T, Yamashita K, Kubo T, Kikuchi T, Sato N, Hasegawa T, Kiyonari H, Mukumoto Y, Takano KI, Himi T, Ichimiya S. Loss of sorting nexin 5 stabilizes internalized growth factor receptors to promote thyroid cancer progression. J Pathol 2017; 243:342-353. [PMID: 28771744 DOI: 10.1002/path.4951] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 07/11/2017] [Accepted: 07/28/2017] [Indexed: 12/19/2022]
Abstract
Thyroid carcinoma is the most common endocrine malignancy and its prevalence has recently been increasing worldwide. We previously reported that the level of sorting nexin 5 (Snx5), an endosomal translocator, is preferentially decreased during the progression of well-differentiated thyroid carcinoma into poorly differentiated carcinoma. To address the functional role of Snx5 in the development and progression of thyroid carcinoma, we established Snx5-deficient (Snx5-/- ) mice. In comparison to wild-type (Snx5+/+ ) mice, Snx5-/- mice showed enlarged thyroid glands that consisted of thyrocytes with large irregular-shaped vacuoles. Snx5-/- thyrocytes exhibited a higher growth potential and higher sensitivity to thyroid-stimulating hormone (TSH). A high content of early endosomes enriched with TSH receptors was found in Snx5-/- thyrocytes, suggesting that loss of Snx5 caused retention of the TSH receptor (TSHR) in response to TSH. Similar data were found for internalized EGF in primary thyrocytes. The increased TSH sensitivities in Snx5-/- thyrocytes were also confirmed by results showing that Snx5-/- mice steadily developed thyroid tumors with high metastatic potential under high TSH. Furthermore, a thyroid cancer model using carcinogen and an anti-thyroidal agent revealed that Snx5-/- mice developed metastasizing thyroid tumors with activation of MAP kinase and AKT pathways, which are postulated to be major pathways of malignant progression of human thyroid carcinoma. Our results suggest that thyrocytes require Snx5 to lessen tumorigenic signaling driven by TSH, which is a major risk factor for thyroid carcinoma. Copyright © 2017 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Sumito Jitsukawa
- Department of Human Immunology, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan.,Department of Otolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Ryuta Kamekura
- Department of Human Immunology, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan.,Department of Otolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Koji Kawata
- Department of Human Immunology, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Fumie Ito
- Department of Human Immunology, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan.,Department of Otolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Akinori Sato
- Department of Human Immunology, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Hiroshi Matsumiya
- Department of Otolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Tomonori Nagaya
- Department of Otolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Keiji Yamashita
- Department of Otolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Terufumi Kubo
- Department of Pathology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Tomoki Kikuchi
- Department of Pathology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Noriyuki Sato
- Department of Pathology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Tadashi Hasegawa
- Department of Pathology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Hiroshi Kiyonari
- Animal Resource Development Unit, RIKEN Center for Life Science Technologies, Kobe, Japan.,Genetic Engineering Team, RIKEN Center for Life Science Technologies, Kobe, Japan
| | - Yoshiko Mukumoto
- Genetic Engineering Team, RIKEN Center for Life Science Technologies, Kobe, Japan
| | - Ken-Ichi Takano
- Department of Otolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Tetsuo Himi
- Department of Otolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Shingo Ichimiya
- Department of Human Immunology, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
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Welch D, Manton C, Hurst D. Breast Cancer Metastasis Suppressor 1 (BRMS1): Robust Biological and Pathological Data, But Still Enigmatic Mechanism of Action. Adv Cancer Res 2016; 132:111-37. [PMID: 27613131 DOI: 10.1016/bs.acr.2016.05.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Metastasis requires coordinated expression of multiple genetic cassettes, often via epigenetic regulation of gene transcription. BRMS1 blocks metastasis, but not orthotopic tumor growth in multiple tumor types, presumably via SIN3 chromatin remodeling complexes. Although there is an abundance of strong data supporting BRMS1 as a metastasis suppressor, the mechanistic data directly connecting molecular pathways with inhibition of particular steps in metastasis are not well defined. In this review, the data for BRMS1-mediated metastasis suppression in multiple tumor types are discussed along with the steps in metastasis that are inhibited.
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Bian Z, Feng Y, Xue Y, Hu Y, Wang Q, Zhou L, Liu Z, Zhang J, Yin Y, Gu B, Huang Z. Down-regulation of SNX1 predicts poor prognosis and contributes to drug resistance in colorectal cancer. Tumour Biol 2015; 37:6619-25. [PMID: 26643894 DOI: 10.1007/s13277-015-3814-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 07/20/2015] [Indexed: 01/18/2023] Open
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12
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Kodura MA, Souchelnytskyi S. Breast carcinoma metastasis suppressor gene 1 (BRMS1): update on its role as the suppressor of cancer metastases. Cancer Metastasis Rev 2015; 34:611-8. [DOI: 10.1007/s10555-015-9583-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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Li F, Yang J, Jones JE, Villar VAM, Yu P, Armando I, Felder RA, Jose PA. Sorting nexin 5 and dopamine d1 receptor regulate the expression of the insulin receptor in human renal proximal tubule cells. Endocrinology 2015; 156:2211-21. [PMID: 25825816 PMCID: PMC4430625 DOI: 10.1210/en.2014-1638] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Sorting nexin 5 (SNX5) belongs to the SNX family, which is composed of a diverse group of proteins that mediate trafficking of plasma membrane proteins, receptors, and transporters. SNX5 is important in the resensitization of the dopamine D1-like receptor (D1R). D1R is uncoupled from its effector proteins in hypertension and diabetes, and treatment of diabetes restores D1R function and insulin receptor (IR) expression. We tested the hypothesis that the D1R and SNX5 regulate IR by studying the expression, distribution, dynamics, and functional consequences of their interaction in human renal proximal tubule cells (hRPTCs). D1R, SNX5, and IR were expressed and colocalized in the brush border of RPTs. Insulin promoted the colocalization of SNX5 and IR at the perinuclear area of hRPTCs. Unlike SNX5, the D1R colocalized and coimmunoprecipitated with IR, and this interaction was enhanced by insulin. To evaluate the role of SNX5 and D1R on IR signaling, we silenced via RNA interference the endogenous expression of SNX5 or the D1R gene DRD1 in hRPTCs. We observed a decrease in IR expression and abundance of phosphorylated IR substrate and phosphorylated protein kinase B, which are crucial components of the IR signal transduction pathway. Our data indicate that SNX5 and D1R are necessary for normal IR expression and activity. It is conceivable that D1R and SNX5 may interact to increase the sensitivity to insulin via a positive regulation of IR and insulin signaling.
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Affiliation(s)
- Fengmin Li
- Department of Physiology and Biophysics (F.L., P.A.J.), Georgetown University Medical Center, Washington, DC 20057; Liver Disease Branch (F.L.), National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892; Department of Nutrition (J.Y.), Daping Hospital, The Third Military Medical University, Chongqing 400042, People's Republic of China; Division of Nephrology (J.Y.J.E.J., V.A.M.V., P.Y., I.A., P.A.J.), Department of Medicine, and Department of Physiology (P.A.J.), University of Maryland School of Medicine, Baltimore, Maryland 21201; and University of Virginia Health Sciences Center (R.A.F.), Charlottesville, Virginia 22908
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Fonseca NA, Marioni J, Brazma A. RNA-Seq gene profiling--a systematic empirical comparison. PLoS One 2014; 9:e107026. [PMID: 25268973 PMCID: PMC4182317 DOI: 10.1371/journal.pone.0107026] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 08/06/2014] [Indexed: 11/18/2022] Open
Abstract
Accurately quantifying gene expression levels is a key goal of experiments using RNA-sequencing to assay the transcriptome. This typically requires aligning the short reads generated to the genome or transcriptome before quantifying expression of pre-defined sets of genes. Differences in the alignment/quantification tools can have a major effect upon the expression levels found with important consequences for biological interpretation. Here we address two main issues: do different analysis pipelines affect the gene expression levels inferred from RNA-seq data? And, how close are the expression levels inferred to the "true" expression levels? We evaluate fifty gene profiling pipelines in experimental and simulated data sets with different characteristics (e.g, read length and sequencing depth). In the absence of knowledge of the 'ground truth' in real RNAseq data sets, we used simulated data to assess the differences between the "true" expression and those reconstructed by the analysis pipelines. Even though this approach does not take into account all known biases present in RNAseq data, it still allows to estimate the accuracy of the gene expression values inferred by different analysis pipelines. The results show that i) overall there is a high correlation between the expression levels inferred by the best pipelines and the true quantification values; ii) the error in the estimated gene expression values can vary considerably across genes; and iii) a small set of genes have expression estimates with consistently high error (across data sets and methods). Finally, although the mapping software is important, the quantification method makes a greater difference to the results.
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Affiliation(s)
- Nuno A. Fonseca
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, United Kingdom
- * E-mail: (NF); (JM); (AB)
| | - John Marioni
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, United Kingdom
- * E-mail: (NF); (JM); (AB)
| | - Alvis Brazma
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, United Kingdom
- * E-mail: (NF); (JM); (AB)
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Metastasis suppression by BRMS1 associated with SIN3 chromatin remodeling complexes. Cancer Metastasis Rev 2013; 31:641-51. [PMID: 22678236 DOI: 10.1007/s10555-012-9363-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Epigenetic regulation of gene transcription by histone modification and chromatin remodeling has been linked to many biological and pathological events including cancer metastasis. Breast cancer metastasis suppressor 1 (BRMS1) interacts with SIN3 chromatin remodeling complexes, and, upon forced expression in metastatic cells, a nearly complete suppression of metastasis is noted without preventing primary tumor growth. The data for BRMS1-mediated metastasis suppression and SIN3 interaction are clear; however, connecting the inhibition directly to the association of BRMS1 with SIN3 complexes is currently not well defined. Considering the recent advancements in developing epigenetic drugs for cancer therapy, an improved understanding of how the interactions between BRMS1 and SIN3 regulate the process of metastasis should lead to novel therapies specifically targeting the most deadly aspect of tumor progression. In this article, the data for BRMS1-mediated metastasis suppression are reviewed with a focus on how the SIN3 chromatin remodeling complexes may be functionally involved.
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Spínola-Amilibia M, Rivera J, Ortiz-Lombardía M, Romero A, Neira JL, Bravo J. BRMS151-98 and BRMS151-84 are crystal oligomeric coiled coils with different oligomerization states, which behave as disordered protein fragments in solution. J Mol Biol 2013; 425:2147-63. [PMID: 23500495 DOI: 10.1016/j.jmb.2013.03.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Revised: 01/09/2013] [Accepted: 03/05/2013] [Indexed: 01/12/2023]
Abstract
The breast cancer metastasis suppressor 1 (BRMS1) gene suppresses metastasis without affecting the primary tumor growth. Cellular localization of BRMS1 appears to be important for exerting its effects on metastasis inhibition. We recently described a nucleo-cytoplasmic shuttling for BRMS1 and identified a nuclear export signal within the N-terminal coiled coil. The structure of these regions shows an antiparallel coiled coil capable of oligomerizing, which compromises the accessibility to the nuclear export signal consensus residues. We have studied the structural and biophysical features of this region to further understand the contribution of the N-terminal coiled coil to the biological function of BRMS1. We have observed that residues 85 to 98 might be important in defining the oligomerization state of the BRMS1 N-terminal coiled coil. The fragments are mainly disordered in solution, with evidence of residual structure. In addition, we report the presence of a conformational dynamic equilibrium (oligomeric folded species ↔ oligomeric unfolded) in solution in the BRMS1 N-terminal coiled coil that might facilitate the nuclear export of BRMS1 to the cytoplasm.
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The C-terminal putative nuclear localization sequence of breast cancer metastasis suppressor 1, BRMS1, is necessary for metastasis suppression. PLoS One 2013; 8:e55966. [PMID: 23390556 PMCID: PMC3563580 DOI: 10.1371/journal.pone.0055966] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Accepted: 01/04/2013] [Indexed: 12/19/2022] Open
Abstract
Breast cancer metastasis suppressor 1 (BRMS1) is a predominantly nuclear protein that suppresses metastasis in multiple human and murine carcinoma cell lines. BRMS1 interacts with several nuclear proteins including SIN3:HDAC chromatin remodeling complexes that are involved in repressing transcription. However, recent reports suggest BRMS1 may function in the cytoplasm. BRMS1 has two predicted nuclear localization sequences (NLS) that are located near the C-terminus (amino acids 198–205 and 238–244, NLS1 and NLS2 respectively). We hypothesized that nuclear localization sequences of BRMS1 were essential for BRMS1 mediated metastasis suppression. Replacement of NLS2 with NLS1 (BRMS1NLS1,1), truncation at 238 (BRMS1ΔNLS2), or switching the location of NLS1 and NLS2 (BRMS1NLS2,1) did not affect nuclear localization; but, replacement of NLS1 with NLS2 (BRMS1NLS2,2) or truncation at 197 (BRMS1ΔNLS which removes both NLS) promoted cytoplasmic localization. MDA-MB-231 human metastatic breast cancer cells transduced with BRMS1NLS1,1, BRMS1NLS2,2 or BRMS1NLS2,1 were evaluated for metastasis suppression in an experimental xenograft mouse model. Interestingly, while NLS2 was not necessary for nuclear localization, it was found to be important for metastasis suppression since BRMS1NLS2,2 suppressed metastasis by 85%. In contrast, BRMS1NLS2,1 and BRMS1NLS1,1 did not significantly suppress metastasis. Both BRMS1 and BRMS1NLS2,2 co-immunoprecipitated with SIN3A in the nucleus and cytoplasm; however, BRMS1NLS1,1 and BRMS1NLS2,1 were associated with SIN3A in the nucleus only. Moreover, BRMS1 and BRMS1NLS2,2, but not BRMS1NLS1,1 and BRMS1NLS2,1, down-regulated the pro-metastatic microRNA, miR-10b. Together, these data demonstrate an important role for NLS2 in the cytoplasm that is critical for metastasis suppression and is distinct from nuclear localization.
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Huang XD, Lu ML, Huang H. Role of breast cancer metastasis suppressor 1 in digestive system neoplasms. Shijie Huaren Xiaohua Zazhi 2012; 20:2583-2588. [DOI: 10.11569/wcjd.v20.i27.2583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Breast cancer metastasis suppressor 1 (BRMS1) is a tumor metastasis suppressor discovered in breast carcinoma cells in 2000. It can reduce the metastasis potential of tumor cells without affecting the growth of orthotopic tumor. BRMS1 is lowly expressed or not at all in metastases of melanoma, bladder carcinoma, pheochromocytoma, ovarian cancer, non-small cell lung cancer, endometrial cancer, nasal and paranasal sinus carcinoma. Malignant tumors have become one of the most serious diseases endangering human health, and digestive system neoplasms are the most common malignant tumors in China. Elucidation of the role of BRMS1 will certainly provide a potential theoretical basis for the molecular diagnosis, targeted therapy, and prognosis evaluation of tumor metastases. In this review, we will summarize recent progress in understanding the role of BRMS1 in digestive system neoplasms.
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Ara S, Kikuchi T, Matsumiya H, Kojima T, Kubo T, Ye RC, Sato A, Kon SI, Honma T, Asakura K, Hasegawa T, Himi T, Sato N, Ichimiya S. Sorting nexin 5 of a new diagnostic marker of papillary thyroid carcinoma regulates Caspase-2. Cancer Sci 2012; 103:1356-62. [PMID: 22486813 DOI: 10.1111/j.1349-7006.2012.02296.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 03/27/2012] [Accepted: 03/31/2012] [Indexed: 12/20/2022] Open
Abstract
Papillary thyroid carcinoma (PTC) is a well-differentiated endocrine malignant tumor that develops from thyroid follicular epithelium. The tumor represents the most common type of endocrine malignancy; however, its tumorigenesis is not fully elucidated. The aim of this study was to address the functional role of the sorting nexin (SNX) family in PTC because of recent experimental evidence suggesting that the SNX family members actively control endocytotic transportation as well as cell fate. Expression profiles of SNX family members of PTC showed a significant quantity of transcripts of SNX5. Further immunohistochemical analysis with an SNX5-specific monoclonal antibody established in this study consistently demonstrated the preferential expression of SNX5 in PTC (94.2%, 113/120 cases) as indicated by studies on 440 cases of various tumors. In contrast, other major carcinomas originating from the lung (2.6%, 1/38 cases), breast (5.1%, 2/39 cases), and intestine (4.2%, 1/24 cases) scarcely expressed SNX5. When we investigated models of murine thyroid tumors induced by the administration of carcinogens, high expression of Snx5 was also observed in well-differentiated thyroid tumors, further implying that the tumorigenesis of the thyroid gland was tightly associated with the abundance of SNX5/Snx5. Moreover epithelial cells expressing excess SNX5 showed high levels of Caspase-2 of an initiator caspase. Collectively these findings suggest that the evaluation of SNX5 expression would support pathological diagnosis of primary and secondary PTC.
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Affiliation(s)
- Shihoko Ara
- Department of Pathology, Sapporo Medical University School of Medicine, Sapporo, Japan
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Spínola-Amilibia M, Rivera J, Ortiz-Lombardía M, Romero A, Neira JL, Bravo J. The structure of BRMS1 nuclear export signal and SNX6 interacting region reveals a hexamer formed by antiparallel coiled coils. J Mol Biol 2011; 411:1114-27. [PMID: 21777593 DOI: 10.1016/j.jmb.2011.07.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 06/21/2011] [Accepted: 07/06/2011] [Indexed: 01/28/2023]
Abstract
We present here the first structural report derived from breast cancer metastasis suppressor 1 (BRMS1), a member of the metastasis suppressor protein group, which, during recent years, have drawn much attention since they suppress metastasis without affecting the growth of the primary tumor. The relevance of the predicted N-terminal coiled coil on the molecular recognition of some of the BRMS1 partners, on its cellular localization and on the role of BRMS1 biological functions such as transcriptional repression prompted us to characterize its three-dimensional structure by X-ray crystallography. The structure of BRMS1 N-terminal region reveals that residues 51-98 form an antiparallel coiled-coil motif and, also, that it has the capability of homo-oligomerizing in a hexameric conformation by forming a trimer of coiled-coil dimers. We have also performed hydrodynamic experiments that strongly supported the prevalence in solution of this quaternary structure for BRMS1(51-98). This work explores the structural features of BRMS1 N-terminal region to help clarify the role of this area in the context of the full-length protein. Our crystallographic and biophysical results suggest that the biological function of BRMS1 may be affected by its ability to promote molecular clustering through its N-terminal coiled-coil region.
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