1
|
Erland LAE, Dumigan CR, Forsyth JA, Frolova L, Yasunaga AB, Pun W, Li ITS, Deyholos MK, Murch SJ. Mammalian Melatonin Agonist Pharmaceuticals Stimulate Rhomboid Proteins in Plants. Biomolecules 2022; 12:biom12070882. [PMID: 35883439 PMCID: PMC9313243 DOI: 10.3390/biom12070882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 12/04/2022] Open
Abstract
Melatonin is a human neurotransmitter and plant signalling metabolite that perceives and directs plant metabolism. The mechanisms of melatonin action in plants remain undefined. We hypothesized that roots have a melatonin-specific receptor and/or transporter that can respond to melatonin-mediating pharmaceuticals. To test this hypothesis Arabidopsis seedlings were grown with melatonin pharmaceutical receptor agonists: ramelteon and tasimelteon, and/or antagonists: luzindole and 4-P-PDOT. Ramelteon was found both to mimic and competitively inhibit melatonin metabolism in plants. Due to the higher selectivity of ramelteon for the MT1 receptor type in humans, a sequence homology search for MT1 in Arabidopsis identified the rhomboid-like protein 7 (RBL7). In physiological studies, Arabidopsis rbl7 mutants were less responsive to ramelteon and melatonin. Quantum dot visualizations of the effects of ramelteon on melatonin binding to root cell membranes revealed a potential mechanism. We propose that RBL7 is a melatonin-interacting protein that directs root architecture and growth in a mechanism that is responsive to environmental factors.
Collapse
Affiliation(s)
- Lauren A. E. Erland
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
- Department of Agriculture, University of the Fraser Valley, Chilliwack, BC V6T 1Z4, Canada
| | - Christopher R. Dumigan
- Department of Biology, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (C.R.D.); (M.K.D.)
| | - Jillian A. Forsyth
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
| | - Liubov Frolova
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
| | - Adam B. Yasunaga
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
| | - Winnie Pun
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
| | - Isaac T. S. Li
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
| | - Michael K. Deyholos
- Department of Biology, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (C.R.D.); (M.K.D.)
| | - Susan J. Murch
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
- Correspondence:
| |
Collapse
|
2
|
Kanaoka MM, Shimizu KK, Xie B, Urban S, Freeman M, Hong Z, Okada K. KOMPEITO, an Atypical Arabidopsis Rhomboid-Related Gene, Is Required for Callose Accumulation and Pollen Wall Development. Int J Mol Sci 2022; 23:5959. [PMID: 35682638 PMCID: PMC9180352 DOI: 10.3390/ijms23115959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 05/20/2022] [Accepted: 05/20/2022] [Indexed: 11/30/2022] Open
Abstract
Fertilization is a key event for sexually reproducing plants. Pollen-stigma adhesion, which is the first step in male-female interaction during fertilization, requires proper pollen wall patterning. Callose, which is a β-1.3-glucan, is an essential polysaccharide that is required for pollen development and pollen wall formation. Mutations in CALLOSE SYNTHASE 5 (CalS5) disrupt male meiotic callose accumulation; however, how CalS5 activity and callose synthesis are regulated is not fully understood. In this paper, we report the isolation of a kompeito-1 (kom-1) mutant defective in pollen wall patterning and pollen-stigma adhesion in Arabidopsis thaliana. Callose was not accumulated in kom-1 meiocytes or microspores, which was very similar to the cals5 mutant. The KOM gene encoded a member of a subclass of Rhomboid serine protease proteins that lacked active site residues. KOM was localized to the Golgi apparatus, and both KOM and CalS5 genes were highly expressed in meiocytes. A 220 kDa CalS5 protein was detected in wild-type (Col-0) floral buds but was dramatically reduced in kom-1. These results suggested that KOM was required for CalS5 protein accumulation, leading to the regulation of meiocyte-specific callose accumulation and pollen wall formation.
Collapse
Affiliation(s)
- Masahiro M. Kanaoka
- Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-Cho, Sakyo-Ku, Kyoto 606-8502, Japan; (K.K.S.); (K.O.)
- Department of Microbiology, Molecular Biology and Biochemistry, University of Idaho, Moscow, ID 83844, USA; (B.X.); (Z.H.)
- Division of Biological Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Kentaro K. Shimizu
- Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-Cho, Sakyo-Ku, Kyoto 606-8502, Japan; (K.K.S.); (K.O.)
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
- Kihara Institute for Biological Research, Yokohama City University, Yokohama 244-0813, Japan
| | - Bo Xie
- Department of Microbiology, Molecular Biology and Biochemistry, University of Idaho, Moscow, ID 83844, USA; (B.X.); (Z.H.)
| | - Sinisa Urban
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA;
| | - Matthew Freeman
- Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK;
| | - Zonglie Hong
- Department of Microbiology, Molecular Biology and Biochemistry, University of Idaho, Moscow, ID 83844, USA; (B.X.); (Z.H.)
| | - Kiyotaka Okada
- Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-Cho, Sakyo-Ku, Kyoto 606-8502, Japan; (K.K.S.); (K.O.)
- Ryukoku Extension Center (REC) Ryukoku University, Yokotani 1-5, Seta Ohe-cho, Otsu-shi 520-2194, Japan
- Core Research of Science and Technology (CREST) Research Project, Tokyo 102-0076, Japan
| |
Collapse
|
3
|
Asadi M, Oanca G, Warshel A. Effect of Environmental Factors on the Catalytic Activity of Intramembrane Serine Protease. J Am Chem Soc 2022; 144:1251-1257. [PMID: 35023734 PMCID: PMC10349665 DOI: 10.1021/jacs.1c10494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The cleavage of protein inside cell membranes regulates pathological pathways and is a subject of major interest. Thus, the nature of the coupling between the physical environment and the function of such proteins has recently attracted significant experimental and theoretical efforts. However, it is difficult to determine the nature of this coupling uniquely by experimental and theoretical studies unless one can separate the chemical and the environmental factors. This work describes calculations of the activation barriers of the intramembrane rhomboid protease in neutral and charged lipid bilayers and in detergent micelle, trying to explore the environmental effect. The calculations of the chemical barrier are done using the empirical valence bond (EVB) method. Additionally, the renormalization method captures the energetics and dynamical effects of the conformational change. The simulations indicate that the physical environment around the rhomboid protease is not a major factor in changing the chemical catalysis and that the conformational and substrate dynamics do not exhibit long-time coupling. General issues about the action of membrane-embedded enzymes are also considered.
Collapse
Affiliation(s)
- Mojgan Asadi
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-1062, United States
| | - Gabriel Oanca
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-1062, United States
| | - Arieh Warshel
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-1062, United States
| |
Collapse
|
4
|
Chen C, Tian D, Su J, Liu X, Shah MAA, Li X, Xu L, Yan R, Song X. Protective Efficacy of Rhomboid-Like Protein 3 as a Candidate Antigen Against Eimeria maxima in Chickens. Front Microbiol 2021; 12:614229. [PMID: 34025594 PMCID: PMC8131851 DOI: 10.3389/fmicb.2021.614229] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 02/15/2021] [Indexed: 12/03/2022] Open
Abstract
Avian coccidiosis brings tremendous economic loss to the poultry industry worldwide. The third generation vaccine, including subunit and DNA vaccines, exhibited promising developmental prospects. In a previous study, we found rhomboid-like protein 3 of Eimeria maxima (EmROM3) was involved in infections by Eimeria species. However, the protective efficacy of EmROM3 against Eimeria maxima (E. maxima) remains unknown. In this study, chickens were intramuscularly immunized with the recombinant protein EmROM3 (rEmROM3) or pVAX1-EmROM3 to determine the EmROM3-induced immune response. The induced humoral immune response was determined by measuring serum IgG antibody levels in immunized chickens. The induced cellular immune response was detected by measuring the transcription level of immune related cytokines and the proportion of T cell subsets of the immunized chickens. Finally, the protective efficacy of the EmROM3 vaccine against E. maxima was evaluated by immunization-challenge trials. Results revealed that the purified rEmROM3 reacted with chicken anti-E. maxima serum. The recombinant plasmid of pVAX1-EmROM3 was transcribed and translated in the injected muscle from the vaccinated chickens. In experimental groups, the IgG titers, proportions of CD4+ and CD8+ T cells, and transcription level of splenic cytokines were significantly increased compared with the control groups. The immunization-challenge trial revealed that immunization with rEmROM3 or pVAX1-EmROM3 led to restored weight gain, alleviated enteric lesion, decreased oocyst output as well as the higher anticoccidial index (ACI), indicating partial protection against E. maxima. These results indicate that EmROM3 is an effective candidate antigen for developing novel vaccines against infection by E. maxima.
Collapse
Affiliation(s)
- Chen Chen
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Di Tian
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Nanjing Ringpai Vet Hospital Co., Ltd., Nanjing, China
| | - Junzhi Su
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Xiaoqian Liu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Muhammad Ali A Shah
- Department of Pathobiology, Pir Mehr Ali Shah Arid Agriculture University, Rawalpindi, Pakistan
| | - Xiangrui Li
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Lixin Xu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Ruofeng Yan
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Xiaokai Song
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| |
Collapse
|
5
|
Xu Z, Wang R, Li X, Yang L, Peng H, Wang Y, Wang P. RHBDD1 silencing inhibited cell growth and invasion of non-small cell lung cancer by mediating ZEB1/PI3K/AKT signaling pathway. J Mol Histol 2021; 52:503-510. [PMID: 33515112 DOI: 10.1007/s10735-020-09943-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 12/04/2020] [Indexed: 12/19/2022]
Abstract
Rhomboid domain containing 1 (RHBDD1) gene, which was reported to be upregulated in human several cancer, was associated with carcinogenesis. However, the potential biological function of RHBDD1 in non-small cell lung cancer (NSCLC) carcinogenesis remains still not known. In this study, we aimed to investigate the role of RHBDD1 and its underlying molecular mechanism in NSCLC. The gene RHBDD1 expression was detected in NSCLC tissues and matched nontumor adjacent tissues. In vitro experiments, NSCLC cell lines (A549, H1650, H358 and H1299) were performed to investigate the biological function of RHBDD1 and its molecular mechanism. Our findings showed that the mRNA and protein expression levels of RHBDD1 were notably increased in human NSCLC tissues and cell lines, especially in A549 and H1650 cells. Moreover, silencing of RHBDD1 by RNAi notably inhibited NSCLC cell proliferation and increased cell apoptosis. Caspase-3/7 activity was remarkably increased in cells treated with RHBDD1 siRNA. RHBDD1 silencing notably reduced the number of invading cells. Furthermore, our findings showed that silencing of RHBDD1 notably inhibited the mRNA and protein expression levels of ZEB1 in A549 and H1650 cells. The phosphorylation of PI3K and AKT was also remarkably decreased by RHBDD1 silencing. ZEB1/AKT overexpression reversed the effect of RHBDD1 silencing on NSCLC cell growth and invasion. Taken together, our findings indicated that RHBDD1 silencing inhibited cell growth and invasion of non-small cell lung cancer by mediating ZEB1/PI3K/AKT signaling pathway, implying that RHBDD1 was possibly a potential diagnostic and therapeutic target for NSCLC treatment.
Collapse
Affiliation(s)
- Zheyuan Xu
- Department of Thoracic surgery, The Second Affiliated Hospital of Kunming Medical University, 650101, Kunming, Yunnan, China
| | - Ran Wang
- Mailman School of Public Health, Columbia University, New York, USA
| | - Xu Li
- Department of Thoracic surgery, The Second Affiliated Hospital of Kunming Medical University, 650101, Kunming, Yunnan, China
| | - Limin Yang
- Department of Thoracic surgery, The Second Affiliated Hospital of Kunming Medical University, 650101, Kunming, Yunnan, China
| | - Hao Peng
- Department of Thoracic Surgery, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Yang Wang
- Department of Thoracic surgery, The Second Affiliated Hospital of Kunming Medical University, 650101, Kunming, Yunnan, China
| | - Ping Wang
- Department of Thoracic surgery, The Second Affiliated Hospital of Kunming Medical University, 650101, Kunming, Yunnan, China.
| |
Collapse
|
6
|
miR-145-5p restrained cell growth, invasion, migration and tumorigenesis via modulating RHBDD1 in colorectal cancer via the EGFR-associated signaling pathway. Int J Biochem Cell Biol 2019; 117:105641. [PMID: 31693935 DOI: 10.1016/j.biocel.2019.105641] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 10/28/2019] [Accepted: 10/30/2019] [Indexed: 11/21/2022]
Abstract
miR-145-5p has been reported to be downregulated and described functioning as a tumor suppressive gene in colorectal cancer (CRC), yet its detailed regulatory function and mechanism in malignant progression of the disease have not been thoroughly understood. In our study, miR-145-5p and rhomboid domain containing 1 (RHBDD1) in CRC tissues and cells were examined by qRT-PCR and western blot. MTT, colony formation, wound healing, Transwell invasion, and flow cytometry assays were performed to evaluate the malignant phenotypes of CRC cells. Xenograft tumor, qRT-PCR, and western blot assays were applied to validate the roles and mechanism of miR-145-5p in CRC in vivo. The interaction between miR-145-5p and RHBDD1 was investigated by luciferase reporter assay and western blot. The changes of the EGFR/Raf/MEK/ERK pathway were detected by western blot. We found miR-145-5p was lowly expressed and low miR-145-5p predicted poor prognosis in CRC, while RHBDD1 was greatly enhanced in CRC cells and tissues. RHBDD1 silencing resulted in inhibiting cell proliferative, invasive, and migratory potentials as well as elevating apoptotic ones in CRC cells. miR-145-5p was inversely related with RHBDD1 expression in CRC tissues. miR-145-5p was found to directly bind to RHBDD1 and restrained its expression in CRC cells. miR-145-5p overexpression repressed CRC cell proliferation, invasion, migration and induced apoptosis, and these effects were reversed by RHBDD1 upregulation. Moreover, in CRC xenograft tumor, its growth was impeded by miR-145-5p via suppressing RHBDD1. Furthermore, miR-145-5p inhibited the expression of EGFR, p-MEK1/2 and p-ERK1/2, in vitro and in vivo by targeting RHBDD1. In conclusion, our study revealed that miR-145-5p overexpression inhibited tumorigenesis in CRC by downregulating RHBDD1 via suppressing the EGFR-associated signaling pathway (EGFR/Raf/MEK/ERK cascades).
Collapse
|
7
|
Geesala R, Issuree PD, Maretzky T. Novel functions of inactive rhomboid proteins in immunity and disease. J Leukoc Biol 2019; 106:823-835. [PMID: 31369701 DOI: 10.1002/jlb.3vmr0219-069r] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 05/03/2019] [Accepted: 06/20/2019] [Indexed: 12/11/2022] Open
Abstract
iRhoms are related to a family of intramembrane serine proteinases called rhomboids but lack proteolytic activity. In mammals, there are two iRhoms, iRhom1 and iRhom2, which have similar domain structures and overlapping specificities as well as distinctive functions. These catalytically inactive rhomboids are essential regulators for the maturation and trafficking of the disintegrin metalloprotease ADAM17 from the endoplasmic reticulum to the cell surface, and are required for the cleavage and release of a variety of membrane-associated proteins, including the IL-6 receptor, l-selectin, TNF, and EGFR ligands. iRhom2-dependent regulation of ADAM17 function has been recently implicated in the development and progression of several autoimmune diseases including rheumatoid arthritis, lupus nephritis, as well as hemophilic arthropathy. In this review, we discuss our current understanding of iRhom biology, their implications in autoimmune pathologies, and their potential as therapeutic targets.
Collapse
Affiliation(s)
- Ramasatyaveni Geesala
- Inflammation Program, Roy J. and Lucille A. Carver College of Medicine University of Iowa, Iowa City, Iowa, USA.,Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine University of Iowa, Iowa City, Iowa, USA
| | - Priya D Issuree
- Inflammation Program, Roy J. and Lucille A. Carver College of Medicine University of Iowa, Iowa City, Iowa, USA.,Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine University of Iowa, Iowa City, Iowa, USA
| | - Thorsten Maretzky
- Inflammation Program, Roy J. and Lucille A. Carver College of Medicine University of Iowa, Iowa City, Iowa, USA.,Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine University of Iowa, Iowa City, Iowa, USA.,Holden Comprehensive Cancer Center, University of Iowa, Iowa City, Iowa, USA
| |
Collapse
|
8
|
Xue Q. Pathogen proteases and host protease inhibitors in molluscan infectious diseases. J Invertebr Pathol 2019; 166:107214. [PMID: 31348922 DOI: 10.1016/j.jip.2019.107214] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 04/11/2019] [Accepted: 06/28/2019] [Indexed: 12/17/2022]
Abstract
The development of infectious diseases represents an outcome of dynamic interactions between the disease-producing agent's pathogenicity and the host's self-defense mechanism. Proteases secreted by pathogenic microorganisms and protease inhibitors produced by host species play an important role in the process. This review aimed at summarizing major findings in research on pathogen proteases and host protease inhibitors that had been proposed to be related to the development of mollusk diseases. Metalloproteases and serine proteases respectively belonging to Family M4 and Family S8 of the MEROPS system are among the most studied proteases that may function as virulence factors in mollusk pathogens. On the other hand, a mollusk-specific family (Family I84) of novel serine protease inhibitors and homologues of the tissue inhibitor of metalloprotease have been studied for their potential in the molluscan host defense. In addition, research at the genomic and transcriptomic levels showed that more proteases of pathogens and protease inhibitor of hosts are likely involved in mollusk disease processes. Therefore, the pathological significance of interactions between pathogen proteases and host protease inhibitors in the development of molluscan infectious diseases deserves more research efforts.
Collapse
Affiliation(s)
- Qinggang Xue
- Zhejiang Key Lab of Aquatic Germplasm Resources, Zhejiang Wanli University, Ningbo, Zhejiang 315100, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China.
| |
Collapse
|
9
|
Banu SS, Meyer W, Ferreira-Paim K, Wang Q, Kuhls K, Cupolillo E, Schönian G, Lee R. A novel multilocus sequence typing scheme identifying genetic diversity amongst Leishmania donovani isolates from a genetically homogeneous population in the Indian subcontinent. Int J Parasitol 2019; 49:555-567. [PMID: 31108098 DOI: 10.1016/j.ijpara.2019.02.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 02/20/2019] [Accepted: 02/23/2019] [Indexed: 01/29/2023]
Abstract
In the Indian subcontinent, infection with Leishmania donovani can cause fatal visceral leishmaniasis. Genetic variation in L. donovani is believed to occur rapidly from environmental changes and through selective drug pressures, thereby allowing continued disease occurrence in this region. All previous molecular markers that are commonly in use multilocus microsatellite typing and multilocus sequence typing, were monomorphic in L. donovani originating from the Indian subcontinent (with only a few exceptions) and hence are not suitable for this region. An multilocus sequence typing scheme consisting of a new set of seven housekeeping genes was developed in this study, based on recent findings from whole genome sequencing data. This new scheme was used to assess the genetic diversity amongst 22 autochthonous L. donovani isolates from Bangladesh. Nineteen additional isolates of the L. donovani complex (including sequences of L. donovani reference strain BPK282A1) from other countries were included for comparison. By using restriction fragment length polymorphism of the internal transcribed spacer 1 region (ITS1-RFLP) and ITS1 sequencing, all Bangladeshi isolates were confirmed to be L. donovani. Population genetic analyses of 41 isolates using the seven new MLST loci clearly separated L. donovani from Leishmania infantum. With this multilocus sequence typing scheme, seven genotypes were identified amongst Bangladeshi L. donovani isolates, and these isolates were found to be phylogenetically different compared with those from India, Nepal, Iraq and Africa. This novel multilocus sequence typing approach can detect intra- and inter-species variations within the L. donovani complex, but most importantly these molecular markers can be applied to resolve the phylogenetically very homogeneous L. donovani strains from the Indian subcontinent. Four of these markers were found suitable to differentiate strains originating from Bangladesh, with marker A2P being the most discriminative one.
Collapse
Affiliation(s)
- Sultana Shahana Banu
- Parasitology Department, Centre for Infectious Diseases and Microbiology Laboratory Services (CIDMLS), Institute of Clinical Pathology and Medical Research (ICPMR), Westmead Hospital, Westmead, Sydney, NSW, Australia; Molecular Mycology Research Laboratory, Centre for Infectious Diseases and Microbiology, Faculty of Medicine and Health, Sydney Medical School, Westmead Clinical School, Marie Bashir Institute for Emerging Infectious Diseases and Biosecurity, Westmead Hospital (Research and Education Network), The University of Sydney, Sydney, NSW, Australia; Westmead Institute for Medical Research, Westmead, Sydney, NSW, Australia; Directorate General of Health Services (DGHS), Ministry of Health and Family Welfare (MOHFW), Dhaka, Bangladesh
| | - Wieland Meyer
- Molecular Mycology Research Laboratory, Centre for Infectious Diseases and Microbiology, Faculty of Medicine and Health, Sydney Medical School, Westmead Clinical School, Marie Bashir Institute for Emerging Infectious Diseases and Biosecurity, Westmead Hospital (Research and Education Network), The University of Sydney, Sydney, NSW, Australia; Westmead Institute for Medical Research, Westmead, Sydney, NSW, Australia
| | - Kennio Ferreira-Paim
- Molecular Mycology Research Laboratory, Centre for Infectious Diseases and Microbiology, Faculty of Medicine and Health, Sydney Medical School, Westmead Clinical School, Marie Bashir Institute for Emerging Infectious Diseases and Biosecurity, Westmead Hospital (Research and Education Network), The University of Sydney, Sydney, NSW, Australia; Westmead Institute for Medical Research, Westmead, Sydney, NSW, Australia; Department of Microbiology, Federal University of Triangulo Mineiro, Uberaba, Brazil
| | - Qinning Wang
- Parasitology Department, Centre for Infectious Diseases and Microbiology Laboratory Services (CIDMLS), Institute of Clinical Pathology and Medical Research (ICPMR), Westmead Hospital, Westmead, Sydney, NSW, Australia
| | - Katrin Kuhls
- Division of Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Wildau, Germany
| | - Elisa Cupolillo
- Laboratory on Leishmaniasis Research, Oswaldo Cruz Institute - Fiocruz, Rio de Janeiro, Brazil
| | - Gabriele Schönian
- Institute for Microbiology and Hygiene CC05, Charité University Medicine Berlin, Berlin, Germany
| | - Rogan Lee
- Parasitology Department, Centre for Infectious Diseases and Microbiology Laboratory Services (CIDMLS), Institute of Clinical Pathology and Medical Research (ICPMR), Westmead Hospital, Westmead, Sydney, NSW, Australia; Molecular Mycology Research Laboratory, Centre for Infectious Diseases and Microbiology, Faculty of Medicine and Health, Sydney Medical School, Westmead Clinical School, Marie Bashir Institute for Emerging Infectious Diseases and Biosecurity, Westmead Hospital (Research and Education Network), The University of Sydney, Sydney, NSW, Australia.
| |
Collapse
|
10
|
Powles J, Ko K. Alternative splice variants of rhomboid proteins: Comparative analysis of database entries for select model organisms and validation of functional potential. F1000Res 2018; 7:139. [PMID: 32201561 PMCID: PMC7065720 DOI: 10.12688/f1000research.13383.2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/23/2018] [Indexed: 11/20/2022] Open
Abstract
Background: Rhomboid serine proteases are present across many species and are often encoded in each species by more than one predicted gene. Based on protein sequence comparisons, rhomboids can be differentiated into groups - secretases, presenilin-like associated rhomboid-like (PARL) proteases, iRhoms, and "inactive" rhomboid proteins. Although these rhomboid groups are distinct, the different types can operate simultaneously. Studies in Arabidopsis showed that the number of rhomboid proteins working simultaneously can be further diversified by alternative splicing. This phenomenon was confirmed for the Arabidopsis plastid rhomboid proteins At1g25290 and At1g74130. Although alternative splicing was determined to be a significant mechanism for diversifying these two Arabidopsis plastid rhomboids, there has yet to be an assessment as to whether this mechanism extends to other rhomboids and to other species. Methods: We thus conducted a comparative analysis of select databases to determine if the alternative splicing mechanism observed for the two Arabidopsis plastid rhomboids was utilized in other species to expand the repertoire of rhomboid proteins. To help verify the in silico observations, select splice variants from different groups were tested for activity using transgenic- and additive-based assays. These assays aimed to uncover evidence that the selected splice variants display capacities to influence processes like antimicrobial sensitivity. Results: A comparison of database entries of six widely used eukaryotic experimental models (human, mouse, Arabidopsis, Drosophila, nematode, and yeast) revealed robust usage of alternative splicing to diversify rhomboid protein structure across the various motifs or regions, especially in human, mouse and Arabidopsis. Subsequent validation studies uncover evidence that the splice variants selected for testing displayed functionality in the different activity assays. Conclusions: The combined results support the hypothesis that alternative splicing is likely used to diversify and expand rhomboid protein functionality, and this potentially occurred across the various motifs or regions of the protein.
Collapse
Affiliation(s)
- Joshua Powles
- Department of Biology, Queen's University, Kingston, Ontario, K7L 3N6, Canada
| | - Kenton Ko
- Department of Biology, Queen's University, Kingston, Ontario, K7L 3N6, Canada
| |
Collapse
|
11
|
Abstract
Fungi are able to switch between different lifestyles in order to adapt to environmental changes. Their ecological strategy is connected to their secretome as fungi obtain nutrients by secreting hydrolytic enzymes to their surrounding and acquiring the digested molecules. We focus on fungal serine proteases (SPs), the phylogenetic distribution of which is barely described so far. In order to collect a complete set of fungal proteases, we searched over 600 fungal proteomes. Obtained results suggest that serine proteases are more ubiquitous than expected. From 54 SP families described in MEROPS Peptidase Database, 21 are present in fungi. Interestingly, 14 of them are also present in Metazoa and Viridiplantae - this suggests that, except one (S64), all fungal SP families evolved before plants and fungi diverged. Most representatives of sequenced eukaryotic lineages encode a set of 13-16 SP families. The number of SPs from each family varies among the analysed taxa. The most abundant are S8 proteases. In order to verify hypotheses linking lifestyle and expansions of particular SP, we performed statistical analyses and revealed previously undescribed associations. Here, we present a comprehensive evolutionary history of fungal SP families in the context of fungal ecology and fungal tree of life.
Collapse
|
12
|
Miao F, Zhang M, Zhao Y, Li X, Yao R, Wu F, Huang R, Li K, Miao S, Ma C, Ju H, Song W, Wang L. RHBDD1 upregulates EGFR via the AP-1 pathway in colorectal cancer. Oncotarget 2017; 8:25251-25260. [PMID: 28445956 PMCID: PMC5421926 DOI: 10.18632/oncotarget.15694] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 01/24/2017] [Indexed: 01/08/2023] Open
Abstract
Our previous study showed that RHBDD1 can activate the EGFR signaling pathway to promote colorectal cancer growth. In the present study, EGFR was decreased when RHBDD1 was knocked down or inactivated. Further analysis found that c-Jun and EGFR protein expression was decreased in RHBDD1 knockdown and inactivated cells. c-Jun overexpression in RHBDD1-inactivated cells rescued EGFR expression in a dose-dependent manner. RHBDD1 overexpression in RHBDD1-inactivated cells restored EGFR expression, but this effect was counteracted by c-Jun knockdown. Furthermore, EGFR and c-Jun were attenuated in the RHBDD1 knockdown and inactivated groups in animal tumor models. Tissue microarray assays demonstrated a correlation between RHBDD1 and EGFR in colorectal cancer patients. Therefore, our findings indicate that RHBDD1 stimulates EGFR expression by promoting the AP-1 pathway.
Collapse
Affiliation(s)
- Fei Miao
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Mengmeng Zhang
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Yuechao Zhao
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Xiaolu Li
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Rongyan Yao
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Fan Wu
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Rong Huang
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Kai Li
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Shiying Miao
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Changwu Ma
- Department of Medical Oncology, Chifeng Municipal Hospital, Chifeng 024000, China
| | - Hongge Ju
- Department of Pathology, Baotou Medical College, Baotou 014040, China.,Department of Pathology, The First Affiliated Hospital of Baotou Medical College, Baotou 014010, China
| | - Wei Song
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Linfang Wang
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| |
Collapse
|
13
|
Bondar AN. Biophysical mechanism of rhomboid proteolysis: Setting a foundation for therapeutics. Semin Cell Dev Biol 2016; 60:46-51. [DOI: 10.1016/j.semcdb.2016.09.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Revised: 08/12/2016] [Accepted: 09/12/2016] [Indexed: 11/16/2022]
|
14
|
Hwang J, Ribbens D, Raychaudhuri S, Cairns L, Gu H, Frost A, Urban S, Espenshade PJ. A Golgi rhomboid protease Rbd2 recruits Cdc48 to cleave yeast SREBP. EMBO J 2016; 35:2332-2349. [PMID: 27655872 DOI: 10.15252/embj.201693923] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 09/06/2016] [Indexed: 12/26/2022] Open
Abstract
Hypoxic growth of fungi requires sterol regulatory element-binding protein (SREBP) transcription factors, and human opportunistic fungal pathogens require SREBP activation for virulence. Proteolytic release of fission yeast SREBPs from the membrane in response to low oxygen requires the Golgi membrane-anchored Dsc E3 ligase complex. Using genetic interaction arrays, we identified Rbd2 as a rhomboid family protease required for SREBP proteolytic processing. Rbd2 is an active, Golgi-localized protease that cleaves the transmembrane segment of the TatA rhomboid model substrate. Epistasis analysis revealed that the Dsc E3 ligase acts on SREBP prior to cleavage by Rbd2. Using APEX2 proximity biotinylation, we demonstrated that Rbd2 binds the AAA-ATPase Cdc48 through a C-terminal SHP box. Interestingly, SREBP cleavage required Rbd2 binding of Cdc48, consistent with Cdc48 acting to recruit ubiquitinylated substrates. In support of this claim, overexpressing a Cdc48-binding mutant of Rbd2 bypassed the Cdc48 requirement for SREBP cleavage, demonstrating that Cdc48 likely plays a role in SREBP recognition. In the absence of functional Rbd2, SREBP precursor is degraded by the proteasome, indicating that Rbd2 activity controls the balance between SREBP activation and degradation.
Collapse
Affiliation(s)
- Jiwon Hwang
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Diedre Ribbens
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Sumana Raychaudhuri
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Leah Cairns
- Howard Hughes Medical Institute, Department of Molecular Biology & Genetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - He Gu
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Adam Frost
- Department of Biochemistry and Biophysics, University of California, San Francisco, CA, USA
| | - Siniša Urban
- Howard Hughes Medical Institute, Department of Molecular Biology & Genetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Peter J Espenshade
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| |
Collapse
|
15
|
Li M, Zhang X, Gong P, Li J. Cryptosporidium parvum rhomboid1 has an activity in microneme protein CpGP900 cleavage. Parasit Vectors 2016; 9:438. [PMID: 27502595 PMCID: PMC4977710 DOI: 10.1186/s13071-016-1728-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 07/26/2016] [Indexed: 11/16/2022] Open
Abstract
Background Apicomplexan parasites actively release transmembrane (TM) adhesive proteins involved in host cell attachment and invasion. Rhomboids, a family of intramembrane serine proteases, cleave these secreted adhesive proteins within their TM domains as an essential step in completing the invasion process. In Cryptosporidium parvum, the activity of rhomboids in cleaving microneme proteins (MICs) has not been reported. In the present study, the interaction between C. parvum rhomboids (CpROM1 and CpROM4) and C. parvum microneme proteins (CpGP900 and CpTRAP-C1) was investigated using yeast two-hybrid assay and co-immunoprecipitation assays. Results Our study demonstrated that CpROM1 protein could interact with CpGP900 protein in co-transformed AH109 yeasts. Analysis of these proteins in co-transfected mammalian cells showed that the cleavage product of the CpGP900 protein was detected in the co-transfected cells. As control, CpGP900 only was transfected into cells and no cleavage was observed. The results suggested that CpGP900 protein was the substrate of CpROM1. Moreover, CpROM1 and CpROM4 could not cleave CpTRAP-C1 protein, which is the substrate of T. gondii rhomboid 2. Conclusions Our results showed that CpROM1 is an active protease that is involved in microneme protein CpGP900 cleavage, which lay the foundation for further research on the mechanisms of C. parvum invasion.
Collapse
Affiliation(s)
- Mingying Li
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, 130062, China
| | - Xichen Zhang
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, 130062, China
| | - Pengtao Gong
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, 130062, China
| | - Jianhua Li
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, 130062, China.
| |
Collapse
|
16
|
Bassi FM, Ghavami F, Hayden MJ, Wang Y, Forrest KL, Kong S, Dizon R, Michalak de Jimenez MK, Meinhardt SW, Mergoum M, Gu YQ, Kianian SF. Fast-forward genetics by radiation hybrids to saturate the locus regulating nuclear-cytoplasmic compatibility in Triticum. PLANT BIOTECHNOLOGY JOURNAL 2016; 14:1716-1726. [PMID: 26915753 PMCID: PMC5067624 DOI: 10.1111/pbi.12532] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 11/24/2015] [Accepted: 12/24/2015] [Indexed: 05/29/2023]
Abstract
The nuclear-encoded species cytoplasm specific (scs) genes control nuclear-cytoplasmic compatibility in wheat (genus Triticum). Alloplasmic cells, which have nucleus and cytoplasm derived from different species, produce vigorous and vital organisms only when the correct version of scs is present in their nucleus. In this study, bulks of in vivo radiation hybrids segregating for the scs phenotype have been genotyped by sequencing with over 1.9 million markers. The high marker saturation obtained for a critical region of chromosome 1D allowed identification of 3318 reads that mapped in close proximity of the scs. A novel in silico approach was deployed to extend these short reads to sequences of up to 70 Kb in length and identify candidate open reading frames (ORFs). Markers were developed to anchor the short contigs containing ORFs to a radiation hybrid map of 650 individuals with resolution of 288 Kb. The region containing the scs locus was narrowed to a single Bacterial Artificial Chromosome (BAC) contig of Aegilops tauschii. Its sequencing and assembly by nano-mapping allowed rapid identification of a rhomboid gene as the only ORF existing within the refined scs locus. Resequencing of this gene from multiple germplasm sources identified a single nucleotide mutation, which gives rise to a functional amino acid change. Gene expression characterization revealed that an active copy of this rhomboid exists on all homoeologous chromosomes of wheat, and depending on the specific cytoplasm each copy is preferentially expressed. Therefore, a new methodology was applied to unique genetic stocks to rapidly identify a strong candidate gene for the control of nuclear-cytoplasmic compatibility in wheat.
Collapse
Affiliation(s)
- Filippo M Bassi
- Department of Plant Sciences, North Dakota State University, Fargo, ND, USA
- International Center for the Agricultural Research in the Dry Areas (ICARDA), Rabat, Morocco
| | - Farhad Ghavami
- Department of Plant Sciences, North Dakota State University, Fargo, ND, USA
- Eurofins BioDiagnostics, Inc., River Falls, WI, USA
| | - Matthew J Hayden
- Department of Environment and Primary Industries, AgriBiosciences Center, Bundoora, Vic, Australia
| | - Yi Wang
- USDA-ARS, Western Regional Research Center, Albany, CA, USA
| | - Kerrie L Forrest
- Department of Environment and Primary Industries, AgriBiosciences Center, Bundoora, Vic, Australia
| | - Stephan Kong
- Department of Environment and Primary Industries, AgriBiosciences Center, Bundoora, Vic, Australia
| | - Rhoderissa Dizon
- Department of Plant Sciences, North Dakota State University, Fargo, ND, USA
| | | | - Steven W Meinhardt
- Department of Plant Pathology, North Dakota State University, Fargo, ND, USA
| | - Mohamed Mergoum
- Department of Plant Sciences, North Dakota State University, Fargo, ND, USA
| | - Yong Q Gu
- USDA-ARS, Western Regional Research Center, Albany, CA, USA
| | - Shahryar F Kianian
- Department of Plant Sciences, North Dakota State University, Fargo, ND, USA
- USDA-ARS Cereal Disease Laboratory, University of Minnesota, Saint Paul, MN, USA
| |
Collapse
|
17
|
RbdB, a Rhomboid Protease Critical for SREBP Activation and Virulence in Aspergillus fumigatus. mSphere 2016; 1:mSphere00035-16. [PMID: 27303716 PMCID: PMC4863583 DOI: 10.1128/msphere.00035-16] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 02/17/2016] [Indexed: 11/25/2022] Open
Abstract
Aspergillus fumigatus causes life-threatening infections, and treatment options remain limited. Thus, there is an urgent need to find new therapeutic targets to treat this deadly disease. Previously, we have shown that SREBP transcription factors and their regulatory components are critical for the pathobiology of A. fumigatus. Here we identify a role for RbdB, a rhomboid protease, as an essential component of SREBP activity. Our results indicate that mutants lacking rbdB have growth defects under hypoxic conditions, are hypersusceptible to voriconazole, lack extracellular siderophore production, and fail to cause disease in a murine model of invasive pulmonary aspergillosis. This study increases our understanding of the molecular mechanisms involved in SREBP activation in pathogenic fungi and provides a novel therapeutic target for future development. SREBP transcription factors play a critical role in fungal virulence; however, the mechanisms of sterol regulatory element binding protein (SREBP) activation in pathogenic fungi remains ill-defined. Screening of the Neurospora crassa whole-genome deletion collection for genes involved in hypoxia responses identified a gene for an uncharacterized rhomboid protease homolog, rbdB, required for growth under hypoxic conditions. Loss of rbdB in Aspergillus fumigatus also inhibited growth under hypoxic conditions. In addition, the A. fumigatus ΔrbdB strain also displayed phenotypes consistent with defective SREBP activity, including increased azole drug susceptibility, reduced siderophore production, and full loss of virulence. Expression of the basic helix-loop-helix (bHLH) DNA binding domain of the SREBP SrbA in ΔrbdB restored all of the phenotypes linking RdbB activity with SrbA function. Furthermore, the N-terminal domain of SrbA containing the bHLH DNA binding region was absent from ΔrbdB under inducing conditions, suggesting that RbdB regulates the protein levels of this important transcription factor. As SrbA controls clinically relevant aspects of fungal pathobiology in A. fumigatus, understanding the mechanisms of SrbA activation provides opportunities to target this pathway for therapeutic development. IMPORTANCEAspergillus fumigatus causes life-threatening infections, and treatment options remain limited. Thus, there is an urgent need to find new therapeutic targets to treat this deadly disease. Previously, we have shown that SREBP transcription factors and their regulatory components are critical for the pathobiology of A. fumigatus. Here we identify a role for RbdB, a rhomboid protease, as an essential component of SREBP activity. Our results indicate that mutants lacking rbdB have growth defects under hypoxic conditions, are hypersusceptible to voriconazole, lack extracellular siderophore production, and fail to cause disease in a murine model of invasive pulmonary aspergillosis. This study increases our understanding of the molecular mechanisms involved in SREBP activation in pathogenic fungi and provides a novel therapeutic target for future development.
Collapse
|
18
|
Lau JB, Stork S, Moog D, Schulz J, Maier UG. Protein-protein interactions indicate composition of a 480 kDa SELMA complex in the second outermost membrane of diatom complex plastids. Mol Microbiol 2016; 100:76-89. [PMID: 26712034 DOI: 10.1111/mmi.13302] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/03/2015] [Indexed: 02/04/2023]
Abstract
Most secondary plastids of red algal origin are surrounded by four membranes and nucleus-encoded plastid proteins have to traverse these barriers. Translocation across the second outermost plastid membrane, the periplastidal membrane (PPM), is facilitated by a ERAD-(ER-associated degradation) derived machinery termed SELMA (symbiont-specific ERAD-like machinery). In the last years, important subunits of this translocator have been identified, which clearly imply compositional similarities between SELMA and ERAD. Here we investigated, via protein-protein interaction studies, if the composition of SELMA is comparable to the known ERAD complex. As a result, our data suggest that the membrane proteins of SELMA, the derlin proteins, are linked to the soluble sCdc48 complex via the UBX protein sUBX. This is similar to the ERAD machinery whereas the additional SELMA components, sPUB und a second Cdc48 copy might indicate the influence of functional constraints in developing a translocation machinery from ERAD-related factors. In addition, we show for the first time that a rhomboid protease is a central interaction partner of the membrane proteins of the SELMA system in complex plastids.
Collapse
Affiliation(s)
- Julia B Lau
- Laboratory for Cell Biology, Philipps-Universität Marburg, Marburg, Germany
| | - Simone Stork
- Laboratory for Cell Biology, Philipps-Universität Marburg, Marburg, Germany
| | - Daniel Moog
- LOEWE Centre for Synthetic Microbiology (SYNMIKRO), Philipps-Universität Marburg, Germany
| | - Julian Schulz
- Laboratory for Cell Biology, Philipps-Universität Marburg, Marburg, Germany
| | - Uwe G Maier
- Laboratory for Cell Biology, Philipps-Universität Marburg, Marburg, Germany.,LOEWE Centre for Synthetic Microbiology (SYNMIKRO), Philipps-Universität Marburg, Germany
| |
Collapse
|
19
|
Song W, Liu W, Zhao H, Li S, Guan X, Ying J, Zhang Y, Miao F, Zhang M, Ren X, Li X, Wu F, Zhao Y, Tian Y, Wu W, Fu J, Liang J, Wu W, Liu C, Yu J, Zong S, Miao S, Zhang X, Wang L. Rhomboid domain containing 1 promotes colorectal cancer growth through activation of the EGFR signalling pathway. Nat Commun 2015; 6:8022. [PMID: 26300397 PMCID: PMC4560765 DOI: 10.1038/ncomms9022] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Accepted: 07/07/2015] [Indexed: 01/22/2023] Open
Abstract
Rhomboid proteins perform a wide range of important functions in a variety of organisms. Recent studies have revealed that rhomboid proteins are involved in human cancer progression; however, the underlying molecular mechanism remains largely unclear. Here we show that RHBDD1, a rhomboid intramembrane serine protease, is highly expressed and closely associated with survival in patients with colorectal cancer. We observe that inactivation of RHBDD1 decreases tumor cell growth. Further studies show that RHBDD1 interacts with proTGFα and induces the ADAM-independent cleavage and secretion of proTGFα. The secreted TGFα further triggers the activation of the EGFR/Raf/MEK/ERK signalling pathway. Finally, the positive correlation of RHBDD1 expression with the EGFR/Raf/MEK/ERK signalling pathway is further corroborated in a murine model of colitis-associated colorectal cancer. These findings provide evidence of a growth-promoting role for RHBDD1 in colorectal cancer and may aid the development of tumor biomarkers or antitumor therapeutics.
Collapse
Affiliation(s)
- Wei Song
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Wenjie Liu
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Hong Zhao
- Department of Abdominal Surgical Oncology, Cancer Hospital &Institute, Chinese Academy of Medical Sciences, Beijing 100021, China
| | - Shangze Li
- College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Xin Guan
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Jianming Ying
- Department of Pathology, Cancer Hospital &Institute, Chinese Academy of Medical Sciences, Beijing 100021, China
| | - Yefan Zhang
- Department of Abdominal Surgical Oncology, Cancer Hospital &Institute, Chinese Academy of Medical Sciences, Beijing 100021, China
| | - Fei Miao
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Mengmeng Zhang
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Xiaoxia Ren
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Xiaolu Li
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Fan Wu
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Yuechao Zhao
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Yuanyuan Tian
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Wenming Wu
- Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - Jun Fu
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Junbo Liang
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Wei Wu
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Changzheng Liu
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Jia Yu
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Shudong Zong
- National Research Institute for Family Planning, WHO Collaboration Center of Human Reproduction, Beijing 100081, China
| | - Shiying Miao
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| | - Xiaodong Zhang
- College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Linfang Wang
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100005, China
| |
Collapse
|
20
|
RHBDL2 is a critical membrane protease for anoikis resistance in human malignant epithelial cells. ScientificWorldJournal 2014; 2014:902987. [PMID: 24977233 PMCID: PMC4058132 DOI: 10.1155/2014/902987] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 04/14/2014] [Accepted: 05/11/2014] [Indexed: 01/11/2023] Open
Abstract
Anoikis resistance allows metastatic tumor cells to survive in a homeless environment. Activation of epithelial growth factor receptor (EGFR) signaling is one of the key mechanisms for metastatic tumor cells to resist anoikis, yet the regulation mechanisms of homeless-triggered EGFR activation in metastatic tumor cells remain unclear. Rhomboid-like-2 (RHBDL2), an evolutionally conserved intramembrane serine protease, can cleave the EGF ligand and thus trigger EGFR activation. Herein, we demonstrated that RHBDL2 overexpression in human epithelial cells resulted in promotion of cell proliferation, reduction of cell adhesion, and suppression of anoikis. During long-term suspension cultures, increased RHBDL2 was only detected in aggressive tumor cell lines. Treatment with the rhomboid protease inhibitor or RHBDL2 shRNA increased cleaved caspase 3, a marker of apoptosis. Finally, inhibition of EGFR activation increased the cleaved caspase 3 and attenuated the detachment-induced focal adhesion kinase phosphorylation. Taken together, these findings provide evidence for the first time that RHBDL2 is a critical molecule in anoikis resistance of malignant epithelial cells, possibly through the EGFR-mediated signaling. Our study demonstrates RHBDL2 as a new therapeutic target for cancer metastasis.
Collapse
|
21
|
Serine Proteases of Malaria Parasite Plasmodium falciparum: Potential as Antimalarial Drug Targets. Interdiscip Perspect Infect Dis 2014; 2014:453186. [PMID: 24799897 PMCID: PMC3988940 DOI: 10.1155/2014/453186] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 01/02/2014] [Accepted: 01/07/2014] [Indexed: 01/08/2023] Open
Abstract
Malaria is a major global parasitic disease and a cause of enormous mortality and morbidity. Widespread drug resistance against currently available antimalarials warrants the identification of novel drug targets and development of new drugs. Malarial proteases are a group of molecules that serve as potential drug targets because of their essentiality for parasite life cycle stages and feasibility of designing specific inhibitors against them. Proteases belonging to various mechanistic classes are found in P. falciparum, of which serine proteases are of particular interest due to their involvement in parasite-specific processes of egress and invasion. In P. falciparum, a number of serine proteases belonging to chymotrypsin, subtilisin, and rhomboid clans are found. This review focuses on the potential of P. falciparum serine proteases as antimalarial drug targets.
Collapse
|
22
|
Parente J, Casabuono A, Ferrari MC, Paggi RA, De Castro RE, Couto AS, Giménez MI. A rhomboid protease gene deletion affects a novel oligosaccharide N-linked to the S-layer glycoprotein of Haloferax volcanii. J Biol Chem 2014; 289:11304-11317. [PMID: 24596091 DOI: 10.1074/jbc.m113.546531] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Rhomboid proteases occur in all domains of life; however, their physiological role is not completely understood, and nothing is known of the biology of these enzymes in Archaea. One of the two rhomboid homologs of Haloferax volcanii (RhoII) is fused to a zinc finger domain. Chromosomal deletion of rhoII was successful, indicating that this gene is not essential for this organism; however, the mutant strain (MIG1) showed reduced motility and increased sensitivity to novobiocin. Membrane preparations of MIG1 were enriched in two glycoproteins, identified as the S-layer glycoprotein and an ABC transporter component. The H. volcanii S-layer glycoprotein has been extensively used as a model to study haloarchaeal protein N-glycosylation. HPLC analysis of oligosaccharides released from the S-layer glycoprotein after PNGase treatment revealed that MIG1 was enriched in species with lower retention times than those derived from the parent strain. Mass spectrometry analysis showed that the wild type glycoprotein released a novel oligosaccharide species corresponding to GlcNAc-GlcNAc(Hex)2-(SQ-Hex)6 in contrast to the mutant protein, which contained the shorter form GlcNAc2(Hex)2-SQ-Hex-SQ. A glycoproteomics approach of the wild type glycopeptide fraction revealed Asn-732 peptide fragments linked to the sulfoquinovose-containing oligosaccharide. This work describes a novel N-linked oligosaccharide containing a repeating SQ-Hex unit bound to Asn-732 of the H. volcanii S-layer glycoprotein, a position that had not been reported as glycosylated. Furthermore, this study provides the first insight on the biological role of rhomboid proteases in Archaea, suggesting a link between protein glycosylation and this protease family.
Collapse
Affiliation(s)
- Juliana Parente
- From the Centro de Investigación en Hidratos de Carbono, Departamento de Química Orgánica, Facultad de Ciencias, Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, Buenos Aires, Argentina and
| | - Adriana Casabuono
- From the Centro de Investigación en Hidratos de Carbono, Departamento de Química Orgánica, Facultad de Ciencias, Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, Buenos Aires, Argentina and
| | - María Celeste Ferrari
- the Instituto de Investigaciones Biológicas, Universidad Nacional de Mar del Plata-Consejo Nacional de Investigaciones Científicas y Técnicas, Funes 3250 4to nivel, 7600 Mar del Plata, Provincia de Buenos Aires, Argentina
| | - Roberto Alejandro Paggi
- the Instituto de Investigaciones Biológicas, Universidad Nacional de Mar del Plata-Consejo Nacional de Investigaciones Científicas y Técnicas, Funes 3250 4to nivel, 7600 Mar del Plata, Provincia de Buenos Aires, Argentina
| | - Rosana Esther De Castro
- the Instituto de Investigaciones Biológicas, Universidad Nacional de Mar del Plata-Consejo Nacional de Investigaciones Científicas y Técnicas, Funes 3250 4to nivel, 7600 Mar del Plata, Provincia de Buenos Aires, Argentina
| | - Alicia Susana Couto
- From the Centro de Investigación en Hidratos de Carbono, Departamento de Química Orgánica, Facultad de Ciencias, Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, Buenos Aires, Argentina and
| | - María Inés Giménez
- the Instituto de Investigaciones Biológicas, Universidad Nacional de Mar del Plata-Consejo Nacional de Investigaciones Científicas y Técnicas, Funes 3250 4to nivel, 7600 Mar del Plata, Provincia de Buenos Aires, Argentina.
| |
Collapse
|
23
|
Wei X, Lv T, Chen D, Guan J. Lentiviral Vector Mediated Delivery of RHBDD1 shRNA down Regulated the Proliferation of Human Glioblastoma Cells. Technol Cancer Res Treat 2014; 13:87-93. [PMID: 23883433 DOI: 10.7785/tcrt.2012.500362] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Rhomboid domain containing 1 (RHBDD1) gene, a new member of rhomboid family of proteins is highly responsible for the regulation of apoptosis by cleaving pro-apoptotic Bcl-2 family protein BIK. Therefore, the higher expression levels of RHBDD1 in cancer tissues may have a direct influence on cancer progression by arresting apoptosis. With this background this study was focused to find out the effect of RHBDD1 silencing on the progression of human brain glioblastoma cells, U251 and U87MG. The results indicated that both cell lines show a higher expression level of RHBDD1 and RNA interference (RNA) mediated gene silencing successfully down regulated the RHBDD1 gene expression. As a result of RHBDD1 silencing the proliferation of both cell types was reduced by over 50%, 5 days after silencing. Moreover the colony formation was completely inhibited and there were no cells present following two week RHBDD1 gene silencing. The cell proliferation was inhibited as a result of cell cycle arrest due to RHBDD1 absence. Therefore, these results clearly indicate that, RHBDD1 is essential for the progression of glioblastoma cells and silencing of it is resulting in significant inhibition of cell cycle progression and cell proliferation. Collectively, this study shows that RHBDD1 gene engineering could be used as an effective tool in malignant brain tumor therapy.
Collapse
Affiliation(s)
- Xiangtai Wei
- Department of Neurosurgery, Sheng Jing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China
| | - Tao Lv
- Department of Neurosurgery, Sheng Jing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China
| | - Duo Chen
- Department of Neurosurgery, Sheng Jing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China
| | - Junhong Guan
- Department of Neurosurgery, Sheng Jing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China
| |
Collapse
|
24
|
Zheng J, Gong P, Jia H, Li M, Zhang G, Zhang X, Li J. Eimeria tenella rhomboid 3 has a potential role in microneme protein cleavage. Vet Parasitol 2014; 201:146-9. [PMID: 24529829 DOI: 10.1016/j.vetpar.2014.01.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Revised: 01/02/2014] [Accepted: 01/19/2014] [Indexed: 01/04/2023]
Abstract
Invasion in several apicomplexan parasites, including Eimeria tenella, is accompanied by shedding of surface adhesins by intramembrane proteolysis mediated by rhomboid protease. We have previously identified E. tenella rhomboid 3 (EtROM3), but its precise role has not been elucidated. In this study, the interactions between EtROM3 and microneme (MIC) proteins were analyzed using the yeast two hybrid technique. The results showed that c-Myc-ROM3 fusion protein interacted with EtMIC4 protein in co-transformed AH109 yeasts, which was further confirmed by immunoprecipitation assay. Smaller EtMIC4 band from co-transformed cells suggested that EtROM3 was an active protease and involved in the cleavage of EtMIC4.
Collapse
Affiliation(s)
- Jun Zheng
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China; National Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Pengtao Gong
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Honglin Jia
- National Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Mingying Li
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Guocai Zhang
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Xichen Zhang
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Jianhua Li
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China.
| |
Collapse
|
25
|
A temporal signature of epidermal growth factor signaling regulates the differentiation of germline cells in testes of Drosophila melanogaster. PLoS One 2013; 8:e70678. [PMID: 23940622 PMCID: PMC3734272 DOI: 10.1371/journal.pone.0070678] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 06/21/2013] [Indexed: 01/08/2023] Open
Abstract
Tissue replenishment from stem cells follows a precise cascade of events, during which stem cell daughters first proliferate by mitotic transit amplifying divisions and then enter terminal differentiation. Here we address how stem cell daughters are guided through the early steps of development. In Drosophila testes, somatic cyst cells enclose the proliferating and differentiating germline cells and the units of germline and surrounding cyst cells are commonly referred to as cysts. By characterizing flies with reduced or increased Epidermal Growth Factor (EGF) signaling we show that EGF triggers different responses in the cysts dependent on its dose. In addition to the previously reported requirement for EGF signaling in cyst formation, a low dose of EGF signaling is required for the progression of the germline cells through transit amplifying divisions, and a high dose of EGF signaling promotes terminal differentiation. Terminal differentiation was promoted in testes expressing a constitutively active EGF Receptor (EGFR) and in testes expressing both a secreted EGF and the EGFR in the cyst cells, but not in testes expressing either only EGF or only EGFR. We propose that as the cysts develop, a temporal signature of EGF signaling is created by the coordinated increase of both the production of active ligands by the germline cells and the amount of available receptor molecules on the cyst cells.
Collapse
|
26
|
Rhomboid domain containing 1 inhibits cell apoptosis by upregulating AP‐1 activity and its downstream target Bcl‐3. FEBS Lett 2013; 587:1793-8. [DOI: 10.1016/j.febslet.2013.04.033] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 04/22/2013] [Accepted: 04/25/2013] [Indexed: 11/19/2022]
|
27
|
Rhomboid domain-containing protein 3 is a negative regulator of TLR3-triggered natural killer cell activation. Proc Natl Acad Sci U S A 2013; 110:7814-9. [PMID: 23610400 DOI: 10.1073/pnas.1220466110] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Rhomboid domain-containing protein 3 (Rhbdd3), which belongs to a family of proteins with rhomboid domain, is widely expressed in immune cells; however, the roles of the Rhbdd members, including Rhbdd3, in immunity remain unknown. Natural killer (NK) cells are critical for host immune defense and also can mediate inflammatory diseases such as hepatitis. Although much is known about how NK cells are activated, the detailed mechanisms for negative regulation of NK cell activation remain to be fully understood. Using Rhbdd3-deficient mice, we reveal that Rhbdd3, selectively up-regulated in NK cells upon Toll-like receptor 3 (TLR3) stimulation, negatively regulates TLR3-mediated NK cell activation in a feedback manner. Rhbdd3 inhibits TLR3-triggered IFN-γ and granzyme B expression of NK cells in cell-cell contact dependence of accessory cells such as dendritic cells and Kupffer cells. Rhbdd3 interacts with DNAX activation protein of 12 kDa and promotes its degradation, inhibiting MAPK activation in TLR3-triggered NK cells. Furthermore, Rhbdd3 plays a critical role in attenuating TLR3-triggered acute inflammation by controlling NK cell activation and accumulation in liver and disrupting NK cell-Kupffer cell interaction. Therefore, Rhbdd3 is a feedback inhibitor of TLR3-triggered NK cell activation. Our study outlines a mechanism for the negative regulation of NK cell activation and also provides clues for the function of the rhomboid proteins in immunity.
Collapse
|
28
|
Abstract
Rhomboid protease was first discovered in Drosophila. Mutation of the fly gene interfered with growth factor signaling and produced a characteristic phenotype of a pointed head skeleton. The name rhomboid has since been widely used to describe a large family of related membrane proteins that have diverse biological functions but share a common catalytic core domain composed of six membrane-spanning segments. Most rhomboid proteases cleave membrane protein substrates near the N terminus of their transmembrane domains. How these proteases function within the confines of the membrane is not completely understood. Recent progress in crystallographic analysis of the Escherichia coli rhomboid protease GlpG in complex with inhibitors has provided new insights into the catalytic mechanism of the protease and its conformational change. Improved biochemical assays have also identified a substrate sequence motif that is specifically recognized by many rhomboid proteases.
Collapse
Affiliation(s)
- Ya Ha
- Department of Pharmacology, Yale School of Medicine, New Haven, Connecticut 06520, USA.
| | | | | |
Collapse
|
29
|
[Royalactin induces queen differentiation in honeybees]. Nature 2013; 473:478-83. [PMID: 23350509 DOI: 10.1038/nature10093] [Citation(s) in RCA: 339] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2010] [Accepted: 04/05/2011] [Indexed: 12/14/2022]
|
30
|
Uritsky N, Shokhen M, Albeck A. The Catalytic Machinery of Rhomboid Proteases: Combined MD and QM Simulations. J Chem Theory Comput 2012; 8:4663-71. [DOI: 10.1021/ct3003767] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Neta Uritsky
- The Julius
Spokojny Bioorganic Chemistry Laboratory,
Department of Chemistry, Bar Ilan University, Ramat Gan 52900, Israel
| | - Michael Shokhen
- The Julius
Spokojny Bioorganic Chemistry Laboratory,
Department of Chemistry, Bar Ilan University, Ramat Gan 52900, Israel
| | - Amnon Albeck
- The Julius
Spokojny Bioorganic Chemistry Laboratory,
Department of Chemistry, Bar Ilan University, Ramat Gan 52900, Israel
| |
Collapse
|
31
|
Ejigiri I, Ragheb DRT, Pino P, Coppi A, Bennett BL, Soldati-Favre D, Sinnis P. Shedding of TRAP by a rhomboid protease from the malaria sporozoite surface is essential for gliding motility and sporozoite infectivity. PLoS Pathog 2012; 8:e1002725. [PMID: 22911675 PMCID: PMC3406075 DOI: 10.1371/journal.ppat.1002725] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Accepted: 04/14/2012] [Indexed: 11/18/2022] Open
Abstract
Plasmodium sporozoites, the infective stage of the malaria parasite, move by gliding motility, a unique form of locomotion required for tissue migration and host cell invasion. TRAP, a transmembrane protein with extracellular adhesive domains and a cytoplasmic tail linked to the actomyosin motor, is central to this process. Forward movement is achieved when TRAP, bound to matrix or host cell receptors, is translocated posteriorly. It has been hypothesized that these adhesive interactions must ultimately be disengaged for continuous forward movement to occur. TRAP has a canonical rhomboid-cleavage site within its transmembrane domain and mutations were introduced into this sequence to elucidate the function of TRAP cleavage and determine the nature of the responsible protease. Rhomboid cleavage site mutants were defective in TRAP shedding and displayed slow, staccato motility and reduced infectivity. Moreover, they had a more dramatic reduction in infectivity after intradermal inoculation compared to intravenous inoculation, suggesting that robust gliding is critical for dermal exit. The intermediate phenotype of the rhomboid cleavage site mutants suggested residual, albeit inefficient cleavage by another protease. We therefore generated a mutant in which both the rhomboid-cleavage site and the alternate cleavage site were altered. This mutant was non-motile and non-infectious, demonstrating that TRAP removal from the sporozoite surface functions to break adhesive connections between the parasite and extracellular matrix or host cell receptors, which in turn is essential for motility and invasion. Malaria infection begins with the bite of an infected mosquito which inoculates sporozoites into the skin. Sporozoites then go to the liver where they invade hepatocytes and replicate, ultimately leading to the blood stage of infection. Sporozoites are motile and actively invade hepatocytes using a unique form of motility called gliding motility. The mechanism by which the parasite moves forward is somewhat similar to a treadmill and the sporozoite protein TRAP, is key to this process. Its extracellular portion binds to host proteins while its intracellular portion binds to the parasite's motor. As the motor moves the protein rearwards, the sporozoite moves forward. It follows that the extracellular adhesive interactions of TRAP must ultimately be disengaged for forward movement to occur. We have generated mutant sporozoites that can only partially disengage these parasite-host adhesive interactions and find that these sporozoites have a halting, constipated movement. Following this, we generated a mutant that cannot disengage these interactions at all and these sporozoites are nonmotile and noninfectious. Lastly we found that a parasite rhomboid protease, ROM4, is on the surface of the sporozoite and thus may be responsible for TRAP cleavage and shedding from the sporozoite surface. Overall, our results demonstrate that robust gliding motility requires the disengagement of adhesive interactions.
Collapse
Affiliation(s)
- Ijeoma Ejigiri
- Department of Microbiology, New York University School of Medicine, New York, New York, United States of America
| | - Daniel R. T. Ragheb
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Paco Pino
- Department of Microbiology, School of Medicine, University of Geneva, Geneva, Switzerland
| | - Alida Coppi
- Department of Microbiology, New York University School of Medicine, New York, New York, United States of America
| | - Brandy Lee Bennett
- Department of Microbiology, New York University School of Medicine, New York, New York, United States of America
| | | | - Photini Sinnis
- Department of Microbiology, New York University School of Medicine, New York, New York, United States of America
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
- * E-mail:
| |
Collapse
|
32
|
Reddy T, Rainey JK. Multifaceted Substrate Capture Scheme of a Rhomboid Protease. J Phys Chem B 2012; 116:8942-54. [DOI: 10.1021/jp305077k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tyler Reddy
- Department of Biochemistry & Molecular Biology and ‡Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
| | - Jan K. Rainey
- Department of Biochemistry & Molecular Biology and ‡Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
| |
Collapse
|
33
|
Zhou Y, Moin SM, Urban S, Zhang Y. An internal water-retention site in the rhomboid intramembrane protease GlpG ensures catalytic efficiency. Structure 2012; 20:1255-63. [PMID: 22705210 DOI: 10.1016/j.str.2012.04.022] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Revised: 02/29/2012] [Accepted: 04/05/2012] [Indexed: 12/11/2022]
Abstract
Rhomboid proteases regulate key cellular pathways, but their biochemical mechanism including how water is made available to the membrane-immersed active site remains ambiguous. We performed four prolonged molecular dynamics simulations initiated from both gate-open and gate-closed states of Escherichia coli rhomboid GlpG in a phospholipid bilayer. GlpG was notably stable in both gating states, experiencing similar tilt and local membrane thinning, with no observable gating transitions, highlighting that gating is rate-limiting. Analysis of dynamics revealed rapid loss of crystallographic waters from the active site, but retention of a water cluster within a site formed by His141, Ser181, Ser185, and/or Gln189. Experimental interrogation of 14 engineered mutants revealed an essential role for at least Gln189 and Ser185 in catalysis with no effect on structural stability. Our studies indicate that spontaneous water supply to the intramembrane active site of rhomboid proteases is rare, but its availability for catalysis is ensured by an unanticipated active site element, the water-retention site.
Collapse
Affiliation(s)
- Yanzi Zhou
- Department of Chemistry, New York University, New York, NY 10003, USA
| | | | | | | |
Collapse
|
34
|
Jeyaraju DV, Sood A, Laforce-Lavoie A, Pellegrini L. Rhomboid proteases in mitochondria and plastids: keeping organelles in shape. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2012; 1833:371-80. [PMID: 22634239 DOI: 10.1016/j.bbamcr.2012.05.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2012] [Revised: 05/10/2012] [Accepted: 05/17/2012] [Indexed: 01/16/2023]
Abstract
Rhomboids constitute the most widespread and conserved family of intramembrane cleaving proteases. They are key regulators of critical cellular processes in bacteria and animals, and are poised to play an equally important role also in plants. Among eukaryotes, a distinct subfamily of rhomboids, prototyped by the mammalian mitochondrial protein Parl, ensures the maintenance of the structural and functional integrity of mitochondria and plastids. Here, we discuss the studies that in the past decade have unveiled the role, regulation, and structure of this unique group of rhomboid proteases. This article is part of a Special Issue entitled: Protein Import and Quality Control in Mitochondria and Plastids.
Collapse
Affiliation(s)
- Danny V Jeyaraju
- Institut universitaire en santé mentale de Québec, Université Laval, Québec, Canada
| | | | | | | |
Collapse
|
35
|
Wan C, Fu J, Wang Y, Miao S, Song W, Wang L. Exosome-related multi-pass transmembrane protein TSAP6 is a target of rhomboid protease RHBDD1-induced proteolysis. PLoS One 2012; 7:e37452. [PMID: 22624035 PMCID: PMC3356283 DOI: 10.1371/journal.pone.0037452] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2011] [Accepted: 04/21/2012] [Indexed: 11/18/2022] Open
Abstract
We have previously reported that rhomboid domain containing 1 (RHBDD1), a mammalian rhomboid protease highly expressed in the testis, can cleave the Bcl-2 protein Bik. In this study, we identified a multi-pass transmembrane protein, tumor suppressor activated pathway-6 (TSAP6) as a potential substrate of RHBDD1. RHBDD1 was found to induce the proteolysis of TSAP6 in a dose- and activity-dependent manner. The cleavage of TSAP6 was not restricted to its glycosylated form and occurred in three different regions. In addition, mass spectrometry and mutagenesis analyses both indicated that the major cleavage site laid in the C-terminal of the third transmembrane domain of TSAP6. A somatic cell knock-in approach was used to genetically inactivate the endogenous RHBDD1 in HCT116 and RKO colon cancer cells. Exosome secretion was significantly elevated when RHBDD1 was inactivated in the two cells lines. The increased exosome secretion was verfied through the detection of certain exosomal components, including Tsg101, Tf-R, FasL and Trail. In addition, the elevation of exosome secretion by RHBDD1 inactivation was reduced when TSAP6 was knocked down, indicating that the role of RHBDD1 in regulating exosomal trafficking is very likely to be TSAP6-dependent. We found that the increase in FasL and Trail increased exosome-induced apoptosis in Jurkat cells. Taken together, our findings suggest that RHBDD1 is involved in the regulation of a nonclassical exosomal secretion pathway through the restriction of TSAP6.
Collapse
Affiliation(s)
- Chunhua Wan
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, China
- School of Public Health, Nantong University, Nantong, China
| | - Jun Fu
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, China
| | - Yong Wang
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, China
| | - Shiying Miao
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, China
| | - Wei Song
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, China
- * E-mail: (WS); (LW)
| | - Linfang Wang
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, China
- * E-mail: (WS); (LW)
| |
Collapse
|
36
|
Abstract
Rhomboids are ubiquitous intramembrane serine proteases the sequences of which are found in nearly all sequenced genomes, including those of plants. They were molecularly characterized in a number of organisms, and were found to play a role in a variety of biological functions including signaling, development, apoptosis, mitochondrial integrity, parasite invasion and more. Although rhomboid sequences are found in plants, very little is known about their function. Here, we present the current knowledge in the rhomboids field in general, and in plant rhomboids in particular. In addition, we discuss possible physiological roles of different plant rhomboids.
Collapse
Affiliation(s)
- Ronit Rimon Knopf
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, Israel
| | | |
Collapse
|
37
|
Xue Y, Chowdhury S, Liu X, Akiyama Y, Ellman J, Ha Y. Conformational change in rhomboid protease GlpG induced by inhibitor binding to its S' subsites. Biochemistry 2012; 51:3723-31. [PMID: 22515733 DOI: 10.1021/bi300368b] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Rhomboid protease conducts proteolysis inside the hydrophobic environment of the membrane. The conformational flexibility of the protease is essential for the enzyme mechanism, but the nature of this flexibility is not completely understood. Here we describe the crystal structure of rhomboid protease GlpG in complex with a phosphonofluoridate inhibitor, which is covalently bonded to the catalytic serine and extends into the S' side of the substrate binding cleft. Inhibitor binding causes subtle but extensive changes in the membrane protease. Many transmembrane helices tilt and shift positions, and the gap between S2 and S5 is slightly widened so that the inhibitor can bind between them. The side chain of Phe-245 from a loop (L5) that acts as a cap rotates and uncovers the opening of the substrate binding cleft to the lipid bilayer. A concurrent turn of the polypeptide backbone at Phe-245 moves the rest of the cap and exposes the catalytic serine to the aqueous solution. This study, together with earlier crystallographic investigation of smaller inhibitors, suggests a simple model for explaining substrate binding to rhomboid protease.
Collapse
Affiliation(s)
- Yi Xue
- Department of Pharmacology, Yale School of Medicine, New Haven, Connecticut 06520, USA
| | | | | | | | | | | |
Collapse
|
38
|
Li J, Han Q, Gong P, Yang T, Ren B, Li S, Zhang X. Toxoplasma gondii rhomboid protein 1 (TgROM1) is a potential vaccine candidate against toxoplasmosis. Vet Parasitol 2012; 184:154-60. [DOI: 10.1016/j.vetpar.2011.08.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 08/04/2011] [Accepted: 08/09/2011] [Indexed: 11/28/2022]
|
39
|
HAN JUNYI, BAI JUNCHAO, YANG YAO, YIN HUA, GAO WEI, LU AIGUO, LIU FEI, GE HAIYAN, LIU ZHONGMIN, WANG JINYI, ZHONG LAN. Lentivirus-mediated knockdown of rhomboid domain containing 1 inhibits colorectal cancer cell growth. Mol Med Rep 2012; 12:377-81. [DOI: 10.3892/mmr.2015.3365] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 08/12/2014] [Indexed: 11/05/2022] Open
|
40
|
Estella C, Voutev R, Mann RS. A dynamic network of morphogens and transcription factors patterns the fly leg. Curr Top Dev Biol 2012; 98:173-98. [PMID: 22305163 DOI: 10.1016/b978-0-12-386499-4.00007-0] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Animal appendages require a proximodistal (PD) axis, which forms orthogonally from the two main body axes, anteroposterior and dorsoventral. In this review, we discuss recent advances that begin to provide insights into the molecular mechanisms controlling PD axis formation in the Drosophila leg. In this case, two morphogens, Wingless (Wg) and Decapentaplegic (Dpp), initiate a genetic cascade that, together with growth of the leg imaginal disc, establishes the PD axis. The analysis of cis-regulatory modules (CRMs) that control the expression of genes at different positions along the PD axis has been particularly valuable in dissecting this complex process. From these experiments, it appears that only one concentration of Wg and Dpp are required to initiate PD axis formation by inducing the expression of Distal-less (Dll), a homeodomain-encoding gene that is required for leg development. Once Dll is turned on, it activates the medially expressed gene dachshund (dac). Cross-regulation between Dll and dac, together with cell proliferation in the growing leg imaginal disc, results in the formation of a rudimentary PD axis. Wg and Dpp also initiate the expression of ligands for the EGFR pathway, which in turn induces the expression of a series of target genes that pattern the distal-most portion of the leg.
Collapse
Affiliation(s)
- Carlos Estella
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York, USA
| | | | | |
Collapse
|
41
|
Haft DH, Varghese N. GlyGly-CTERM and rhombosortase: a C-terminal protein processing signal in a many-to-one pairing with a rhomboid family intramembrane serine protease. PLoS One 2011; 6:e28886. [PMID: 22194940 PMCID: PMC3237569 DOI: 10.1371/journal.pone.0028886] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Accepted: 11/16/2011] [Indexed: 11/30/2022] Open
Abstract
The rhomboid family of serine proteases occurs in all domains of life. Its members contain at least six hydrophobic membrane-spanning helices, with an active site serine located deep within the hydrophobic interior of the plasma membrane. The model member GlpG from Escherichia coli is heavily studied through engineered mutant forms, varied model substrates, and multiple X-ray crystal studies, yet its relationship to endogenous substrates is not well understood. Here we describe an apparent membrane anchoring C-terminal homology domain that appears in numerous genera including Shewanella, Vibrio, Acinetobacter, and Ralstonia, but excluding Escherichia and Haemophilus. Individual genomes encode up to thirteen members, usually homologous to each other only in this C-terminal region. The domain's tripartite architecture consists of motif, transmembrane helix, and cluster of basic residues at the protein C-terminus, as also seen with the LPXTG recognition sequence for sortase A and the PEP-CTERM recognition sequence for exosortase. Partial Phylogenetic Profiling identifies a distinctive rhomboid-like protease subfamily almost perfectly co-distributed with this recognition sequence. This protease subfamily and its putative target domain are hereby renamed rhombosortase and GlyGly-CTERM, respectively. The protease and target are encoded by consecutive genes in most genomes with just a single target, but far apart otherwise. The signature motif of the Rhombo-CTERM domain, often SGGS, only partially resembles known cleavage sites of rhomboid protease family model substrates. Some protein families that have several members with C-terminal GlyGly-CTERM domains also have additional members with LPXTG or PEP-CTERM domains instead, suggesting there may be common themes to the post-translational processing of these proteins by three different membrane protein superfamilies.
Collapse
Affiliation(s)
- Daniel H Haft
- Department of Bioinformatics, J. Craig Venter Institute, Rockville, Maryland, United States of America.
| | | |
Collapse
|
42
|
Crawford F, Crynen G, Reed J, Mouzon B, Bishop A, Katz B, Ferguson S, Phillips J, Ganapathi V, Mathura V, Roses A, Mullan M. Identification of plasma biomarkers of TBI outcome using proteomic approaches in an APOE mouse model. J Neurotrauma 2011; 29:246-60. [PMID: 21895520 DOI: 10.1089/neu.2011.1789] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The current lack of diagnostic and prognostic biomarkers for traumatic brain injury (TBI) confounds treatment and management of patients and is of increasing concern as the TBI population grows. We have generated plasma proteomic profiles from mice receiving TBI by controlled cortical impact at either 1.3 mm or 1.8 mm depth, comparing these against those of sham injured-animals to identify plasma biomarkers specific to mild or severe TBI at 24 hours, 1 month, or 3 months post-injury. To identify possible prognostic biomarkers, we used apolipoprotein E (APOE)3 and APOE4 transgenic mice, which demonstrate relatively favorable and unfavorable outcomes respectively, following TBI. Using a quantitative proteomics approach (isobaric tagging for relative and absolute quantitation--iTRAQ) we have identified proteins that are significantly modulated as a function of TBI and also in response to the TBI*APOE genotype interaction, the latter representing potential prognostic biomarkers. These preliminary data clearly demonstrate plasma protein changes that are not only injury dependent but also interaction dependent. Importantly, these results demonstrate the presence of TBI-dependent and interaction-dependent plasma proteins at a 3-month time point, which is a considerable time post-injury in the mouse model, and will potentially be of significance for combat veterans receiving assessment at extended periods post-injury. Furthermore, our identification of clusters of functionally related proteins indicates disturbance of particular biological modules, which potentially increases their value beyond that of solitary biomarkers.
Collapse
|
43
|
Xue Y, Ha Y. Catalytic mechanism of rhomboid protease GlpG probed by 3,4-dichloroisocoumarin and diisopropyl fluorophosphonate. J Biol Chem 2011; 287:3099-107. [PMID: 22130671 DOI: 10.1074/jbc.m111.310482] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Rhomboid proteases have many important biological functions. Unlike soluble serine proteases such as chymotrypsin, the active site of rhomboid protease, which contains a Ser-His catalytic dyad, is submerged in the membrane and surrounded by membrane-spanning helices. Previous crystallographic analyses of GlpG, a bacterial rhomboid protease, and its complex with isocoumarin have provided insights into the mechanism of the membrane protease. Here, we studied the interaction of GlpG with 3,4-dichloroisocoumarin and diisopropyl fluorophosphonate, both mechanism-based inhibitors for the serine protease, and describe the crystal structure of the covalent adduct between GlpG and diisopropyl fluorophosphonate, which mimics the oxyanion-containing tetrahedral intermediate of the hydrolytic reaction. The crystal structure confirms that the oxyanion is stabilized by the main chain amide of Ser-201 and by the side chains of His-150 and Asn-154. The phosphorylation of the catalytic Ser-201 weakens its interaction with His-254, causing the catalytic histidine to rotate away from the serine. The rotation of His-254 is accompanied by further rearrangement of the side chains of Tyr-205 and Trp-236 within the substrate-binding groove. The formation of the tetrahedral adduct is also accompanied by opening of the L5 cap and movement of transmembrane helix S5 toward S6 in a direction different from that predicted by the lateral gating model. Combining the new structural data with those on the isocoumarin complex sheds further light on the plasticity of the active site of rhomboid membrane protease.
Collapse
Affiliation(s)
- Yi Xue
- Department of Pharmacology, Yale School of Medicine, New Haven, Connecticut 06520, USA
| | | |
Collapse
|
44
|
Archaeosortases and exosortases are widely distributed systems linking membrane transit with posttranslational modification. J Bacteriol 2011; 194:36-48. [PMID: 22037399 DOI: 10.1128/jb.06026-11] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Multiple new prokaryotic C-terminal protein-sorting signals were found that reprise the tripartite architecture shared by LPXTG and PEP-CTERM: motif, TM helix, basic cluster. Defining hidden Markov models were constructed for all. PGF-CTERM occurs in 29 archaeal species, some of which have more than 50 proteins that share the domain. PGF-CTERM proteins include the major cell surface protein in Halobacterium, a glycoprotein with a partially characterized diphytanylglyceryl phosphate linkage near its C terminus. Comparative genomics identifies a distant exosortase homolog, designated archaeosortase A (ArtA), as the likely protein-processing enzyme for PGF-CTERM. Proteomics suggests that the PGF-CTERM region is removed. Additional systems include VPXXXP-CTERM/archeaosortase B in two of the same archaea and PEF-CTERM/archaeosortase C in four others. Bacterial exosortases often fall into subfamilies that partner with very different cohorts of extracellular polymeric substance biosynthesis proteins; several species have multiple systems. Variant systems include the VPDSG-CTERM/exosortase C system unique to certain members of the phylum Verrucomicrobia, VPLPA-CTERM/exosortase D in several alpha- and deltaproteobacterial species, and a dedicated (single-target) VPEID-CTERM/exosortase E system in alphaproteobacteria. Exosortase-related families XrtF in the class Flavobacteria and XrtG in Gram-positive bacteria mark distinctive conserved gene neighborhoods. A picture emerges of an ancient and now well-differentiated superfamily of deeply membrane-embedded protein-processing enzymes. Their target proteins are destined to transit cellular membranes during their biosynthesis, during which most undergo additional posttranslational modifications such as glycosylation.
Collapse
|
45
|
Abstract
Summary Rhomboid proteases are the largest family of enzymes that hydrolyze peptide bonds within the cell membrane. Although discovered to be serine proteases only a decade ago, rhomboid proteases are already considered to be the best understood intramembrane proteases. The presence of rhomboid proteins in all domains of life emphasizes their importance but makes their evolutionary history difficult to chart with confidence. Phylogenetics nevertheless offers three guiding principles for interpreting rhomboid function. The near ubiquity of rhomboid proteases across evolution suggests broad, organizational roles that are not directly essential for cell survival. Functions have been deciphered in only about a dozen organisms and fall into four general categories: initiating cell signaling in animals, facilitating bacterial quorum sensing, regulating mitochondrial homeostasis, and dismantling adhesion complexes of parasitic protozoa. Although in no organism has the full complement of rhomboid function yet been elucidated, links to devastating human disease are emerging rapidly, including to Parkinson's disease, type II diabetes, cancer, and bacterial and malaria infection. Rhomboid proteases are unlike most proteolytic enzymes, because they are membrane-immersed; understanding how the membrane immersion affects their function remains a key challenge.
Collapse
Affiliation(s)
- Sinisa Urban
- Howard Hughes Medical Institute, Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
| | | |
Collapse
|
46
|
Abstract
The Golgi is essential for processing proteins and sorting them, as well as plasma membrane components, to their final destinations. Not surprisingly, this organelle, a major compartment of the secretory pathway, is an important venue for regulating many aspects of development in both invertebrates and vertebrates. Through its role as a site for protein cleavage and glycosylation as well as through changes in its spatial organization and secretory trafficking, the Golgi exerts highly specific effects on cellular differentiation and morphogenesis by spatially and temporally constraining developmental pathways.
Collapse
|
47
|
Wojcinski A, Nakato H, Soula C, Glise B. DSulfatase-1 fine-tunes Hedgehog patterning activity through a novel regulatory feedback loop. Dev Biol 2011; 358:168-80. [PMID: 21806980 DOI: 10.1016/j.ydbio.2011.07.027] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 06/20/2011] [Accepted: 07/16/2011] [Indexed: 01/25/2023]
Abstract
Sulfs are secreted sulfatases that catalyse removal of sulfate from Heparan Sulfate Proteoglycans (HSPGs) in the extracellular space. These enzymes are well known to regulate a number of crucial signalling pathways during development. In this study, we report that DSulfatase-1 (DSulf1), the unique Drosophila Sulf protein, is a regulator of Hedgehog (Hh) signalling during wing development. DSulf1 activity is required in both Hh source and Hh receiving cells for proper positioning of Hh target gene expression boundaries. As assessed by loss- and gain-of-function experiments in specific compartments, DSulf1 displays dual functions with respect to Hh signalling, acting as a positive regulator in Hh producing cells and a negative regulator in Hh receiving cells. In either domain, DSulf1 modulates Hh distribution by locally lowering the concentration of the morphogen at the apical pole of wing disc cells. Thus, we propose that DSulf1, by its desulfation catalytic activity, lowers Hh/HSPG interaction in both Hh source and target fields, thereby enhancing Hh release from its source of production and reducing Hh signalling activity in responding cells. Finally, we show that Dsulf1 pattern of expression is temporally regulated and depends on EGFR signalling, a Hh-dependent secondary signal in this tissue. Our data reveal a novel Hh regulatory feedback loop, involving DSulf1, which contributes to maintain and stabilise expression domains of Hh target genes during wing disc development.
Collapse
Affiliation(s)
- Alexandre Wojcinski
- Université de Toulouse, UPS, CNRS, Centre de Biologie du Développement, 118. route de Narbonne, F-31062 Toulouse, France
| | | | | | | |
Collapse
|
48
|
Expansion of type II CAAX proteases reveals evolutionary origin of γ-secretase subunit APH-1. J Mol Biol 2011; 410:18-26. [PMID: 21570408 DOI: 10.1016/j.jmb.2011.04.066] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Revised: 04/25/2011] [Accepted: 04/28/2011] [Indexed: 11/21/2022]
Abstract
Intramembrane proteases are responsible for a number of regulated proteolysis events occurring within or near the plasma and intracellular membranes. Members of one large and diverse family of putative intramembrane metalloproteases are widely distributed in all domains of life, including the type II CAAX prenyl proteases and their prokaryotic homologs with putative bacteriocin-related functions. We used sensitive sequence similarity searches to expand this large CPBP (CAAX proteases and bacteriocin-processing enzymes) family to include more than 5800 members and infer its homologous relationships to several other protein families, including the PrsW proteases, the DUF2324 (DUF, domain of unknown function) family and the γ-secretase subunit APH-1 proteins. They share four predicted core transmembrane segments and possess similar yet distinct sets of sequence motifs. Remote similarity between APH-1 and membrane proteases sheds light on APH-1's evolutionary origin and raises the possibility that APH-1 may possess proteolytic activity in the current or ancestral form of γ-secretase.
Collapse
|
49
|
Abstract
The mitochondrial rhomboid protease Parl governs apoptosis, morphology, metabolism and might be implicated in Parkinson's disease, but the structural basis of its activity and complex regulation remain unknown. We report the discovery of γ-cleavage, a proteolytic event on the loop connecting the first transmembrane helix (TMH) of Parl to the 6-TMH catalytic rhomboid domain of the protease. This cleavage disrupts the '1+6' structure that defines every mitochondrial rhomboid and generates a new form of Parl, PROD (Parl-rhomboid-domain). Structure-function analysis of Parl suggests that γ-cleavage could be implicated in eliminating Parl proteolytic activity, and structural modeling of PROD reveals structural conservation with the bacterial rhomboid GlpG. However, unlike bacterial rhomboids, which employ a diad-based mechanism of catalysis, Parl appears to use a conserved mitochondrial rhomboid-specific Asp residue on TMH-5 in a triad-based mechanism of catalysis. This work provides unexpected insights into the structural determinants regulating Parl stability and activity in vivo, and reveals a complex cascade of proteolytic events controlling the function of the protease in the mitochondrion.
Collapse
|
50
|
Santos JM, Soldati-Favre D. Invasion factors are coupled to key signalling events leading to the establishment of infection in apicomplexan parasites. Cell Microbiol 2011; 13:787-96. [DOI: 10.1111/j.1462-5822.2011.01585.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|