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Sundaram MV, Pujol N. The Caenorhabditis elegans cuticle and precuticle: a model for studying dynamic apical extracellular matrices in vivo. Genetics 2024; 227:iyae072. [PMID: 38995735 PMCID: PMC11304992 DOI: 10.1093/genetics/iyae072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 03/25/2024] [Indexed: 07/14/2024] Open
Abstract
Apical extracellular matrices (aECMs) coat the exposed surfaces of animal bodies to shape tissues, influence social interactions, and protect against pathogens and other environmental challenges. In the nematode Caenorhabditis elegans, collagenous cuticle and zona pellucida protein-rich precuticle aECMs alternately coat external epithelia across the molt cycle and play many important roles in the worm's development, behavior, and physiology. Both these types of aECMs contain many matrix proteins related to those in vertebrates, as well as some that are nematode-specific. Extensive differences observed among tissues and life stages demonstrate that aECMs are a major feature of epithelial cell identity. In addition to forming discrete layers, some cuticle components assemble into complex substructures such as ridges, furrows, and nanoscale pillars. The epidermis and cuticle are mechanically linked, allowing the epidermis to sense cuticle damage and induce protective innate immune and stress responses. The C. elegans model, with its optical transparency, facilitates the study of aECM cell biology and structure/function relationships and all the myriad ways by which aECM can influence an organism.
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Affiliation(s)
- Meera V Sundaram
- Department of Genetics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Nathalie Pujol
- Aix Marseille University, INSERM, CNRS, CIML, Turing Centre for Living Systems, 13009 Marseille, France
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Reversal of Multidrug Resistance by Symmetrical Selenoesters in Colon Adenocarcinoma Cells. Pharmaceutics 2023; 15:pharmaceutics15020610. [PMID: 36839934 PMCID: PMC9967742 DOI: 10.3390/pharmaceutics15020610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 01/31/2023] [Accepted: 02/07/2023] [Indexed: 02/15/2023] Open
Abstract
Recently, selenium containing derivatives have attracted more attention in medicinal chemistry. In the present work, the anticancer activity of symmetrical selenoesters was investigated by studying the reversal of efflux pump-related and apoptosis resistance in sensitive and resistant human colon adenocarcinoma cells expressing the ABCB1 protein. The combined effect of the compounds with doxorubicin was demonstrated with a checkerboard assay. The ABCB1 inhibitory and the apoptosis-inducing effects of the derivatives were measured with flow cytometry. Whole transcriptome sequencing was carried out on Illumina platform upon the treatment of resistant cells with the most potent derivatives. One ketone and three methyl ester selenoesters showed synergistic or weak synergistic interaction with doxorubicin, respectively. Ketone selenoesters were the most potent ABCB1 inhibitors and apoptosis inducers. Nitrile selenoesters could induce moderate early and late apoptotic processes that could be explained by their ABCB1 modulating properties. The transcriptome analysis revealed that symmetrical selenoesters may influence the redox state of the cells and interfere with metastasis formation. It can be assumed that these symmetrical selenocompounds possess toxic, DNA-damaging effects due to the presence of two selenium atoms in the molecule, which may be augmented by the presence of symmetrical groups.
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Lee CL, Lee M, Lee JY, Hong SH, Yang SW, Min JH, Lee DE, Baek J, Kim C, Lim JS, Song KH, Shin JH, Kim GH. Transcriptomic Profiling Analysis of Castration-Resistant Prostate Cancer Cell Lines Treated with Chronic Intermittent Hypoxia. Cancers (Basel) 2022; 14:cancers14163959. [PMID: 36010952 PMCID: PMC9406188 DOI: 10.3390/cancers14163959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 08/07/2022] [Accepted: 08/14/2022] [Indexed: 11/16/2022] Open
Abstract
Simple Summary Prostate cancer is the second most frequently diagnosed cancer and the fifth cause of cancer mortality among men. Although localized and confined tumors are relatively curable, patients with advanced metastatic prostate cancer are still problematic. Hypoxia, which is a marked characteristic of advanced solid tumors, has been suggested to induce the progression of prostate cancer. This study aimed to evaluate the impact of chronic intermittent hypoxia on a castration-resistant prostate cancer cell line in inducing cancer progression using RNA sequencing analysis. Through RNA sequencing analysis, we prove that COL13A1, which is a key factor for the progression of metastasis, is closely related to metastatic prostate cancer. These results suggest that our findings indicate a novel strategy for the clinical management of mCRPC. Abstract Castration-resistant prostate cancer (CRPC) is still a major concern in men’s health, with 375,000 cancer deaths annually. Hypoxia, which is a marked characteristic of advanced solid tumors, has been suggested to induce prostate cancer towards CRPC, metastasis and treatment resistance. To evaluate the effect of hypoxia on prostate cancer, two and five cycles of hypoxia and reoxygenation were administered using 22Rv1 cell lines and denominated as 22Rv1-CI and 22Rv1-PCI, respectively. Cancer cell migration was promoted in 22Rv1-CI compared to controls, and the expression of COL13A1 was significantly up-regulated in 22Rv1-CI according to differentially expressed gene analysis of RNA sequencing among groups. Cancer cell migration was impeded in a wound healing assay after transfecting si-COL13A1. Moreover, the expression of COL13A1 was also higher in the cell line originating from bone metastatic prostate cancer compared to other cell lines. Using the open database GEO, we also confirmed that the expression of COL13A1 was higher in bone metastatic prostate cancer tissue than in localized prostate cancer tissue in patients. Therefore, COL13A1 may be closely related to the bony metastasis of prostate cancer, and our findings may provide valuable information on the pathophysiology of the metastatic niche induced by hypoxia in patients with CRPC.
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Affiliation(s)
- Chung Lyul Lee
- Department of Urology, College of Medicine, Chungnam National University, 266, Munhwa-ro, Jung-gu, Daejeon 35015, Korea
| | - Minji Lee
- Department of Bio-Analytical Science, University of Science and Technology (UST), Daejeon 34113, Korea
| | - Ji Yong Lee
- Department of Urology, College of Medicine, Chungnam National University, 266, Munhwa-ro, Jung-gu, Daejeon 35015, Korea
| | - Sin-hyoung Hong
- Department of Bio-Analytical Science, University of Science and Technology (UST), Daejeon 34113, Korea
- Research Center for Bio convergence Analysis, Korea Basic Science Institute (KBSI), Ochang 28119, Korea
| | - Seung Woo Yang
- Department of Urology, College of Medicine, Chungnam National University, 266, Munhwa-ro, Jung-gu, Daejeon 35015, Korea
| | - Ji-hyeon Min
- Research Center for Bio convergence Analysis, Korea Basic Science Institute (KBSI), Ochang 28119, Korea
- Graduate School of Analytical Science and Technology (GRAST), Chungnam National University, Daejeon 34134, Korea
| | - Dong-eon Lee
- Department of Bio-Analytical Science, University of Science and Technology (UST), Daejeon 34113, Korea
- Research Center for Bio convergence Analysis, Korea Basic Science Institute (KBSI), Ochang 28119, Korea
| | - Joonyoung Baek
- Research Center for Bio convergence Analysis, Korea Basic Science Institute (KBSI), Ochang 28119, Korea
- Graduate School of Analytical Science and Technology (GRAST), Chungnam National University, Daejeon 34134, Korea
| | - Chanseul Kim
- Research Center for Bio convergence Analysis, Korea Basic Science Institute (KBSI), Ochang 28119, Korea
- Graduate School of Analytical Science and Technology (GRAST), Chungnam National University, Daejeon 34134, Korea
| | - Jae Sung Lim
- Department of Urology, College of Medicine, Chungnam National University, 266, Munhwa-ro, Jung-gu, Daejeon 35015, Korea
| | - Ki Hak Song
- Department of Urology, College of Medicine, Chungnam National University, 266, Munhwa-ro, Jung-gu, Daejeon 35015, Korea
| | - Ju Hyun Shin
- Department of Urology, College of Medicine, Chungnam National University, 266, Munhwa-ro, Jung-gu, Daejeon 35015, Korea
- Correspondence: (J.H.S.); (G.-H.K.); Tel.: +82-42-2807810 (J.H.S.); +82-43-2405420 (G.-H.K.)
| | - Gun-Hwa Kim
- Department of Bio-Analytical Science, University of Science and Technology (UST), Daejeon 34113, Korea
- Research Center for Bio convergence Analysis, Korea Basic Science Institute (KBSI), Ochang 28119, Korea
- Graduate School of Analytical Science and Technology (GRAST), Chungnam National University, Daejeon 34134, Korea
- Correspondence: (J.H.S.); (G.-H.K.); Tel.: +82-42-2807810 (J.H.S.); +82-43-2405420 (G.-H.K.)
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Tuusa J, Kokkonen N, Tasanen K. BP180/Collagen XVII: A Molecular View. Int J Mol Sci 2021; 22:12233. [PMID: 34830116 PMCID: PMC8623354 DOI: 10.3390/ijms222212233] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 11/08/2021] [Accepted: 11/09/2021] [Indexed: 12/12/2022] Open
Abstract
BP180 is a type II collagenous transmembrane protein and is best known as the major autoantigen in the blistering skin disease bullous pemphigoid (BP). The BP180 trimer is a central component in type I hemidesmosomes (HD), which cause the adhesion between epidermal keratinocytes and the basal lamina, but BP180 is also expressed in several non-HD locations, where its functions are poorly characterized. The immunological roles of intact and proteolytically processed BP180, relevant in BP, have been subject to intensive research, but novel functions in cell proliferation, differentiation, and aging have also recently been described. To better understand the multiple physiological functions of BP180, the focus should return to the protein itself. Here, we comprehensively review the properties of the BP180 molecule, present new data on the biochemical features of its intracellular domain, and discuss their significance with regard to BP180 folding and protein-protein interactions.
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Affiliation(s)
| | | | - Kaisa Tasanen
- PEDEGO Research Unit, Department of Dermatology, Medical Research Center Oulu, Oulu University Hospital and University of Oulu, P.O. Box 8000, FI-90014 Oulu, Finland; (J.T.); (N.K.)
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Wakabayashi T. Transmembrane Collagens in Neuromuscular Development and Disorders. Front Mol Neurosci 2021; 13:635375. [PMID: 33536873 PMCID: PMC7848082 DOI: 10.3389/fnmol.2020.635375] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 12/28/2020] [Indexed: 11/13/2022] Open
Abstract
Neuromuscular development is a multistep process and involves interactions among various extracellular and transmembrane molecules that facilitate the precise targeting of motor axons to synaptogenic regions of the target muscle. Collagenous proteins with transmembrane domains have recently emerged as molecules that play essential roles in multiple aspects of neuromuscular formation. Membrane-associated collagens with interrupted triple helices (MACITs) are classified as an unconventional subtype of the collagen superfamily and have been implicated in cell adhesion in a variety of tissues, including the neuromuscular system. Collagen XXV, the latest member of the MACITs, plays an essential role in motor axon growth within the developing muscle. In humans, loss-of-function mutations of collagen XXV result in developmental ocular motor disorders. In contrast, collagen XIII contributes to the formation and maintenance of neuromuscular junctions (NMJs), and disruption of its function leads to the congenital myasthenic syndrome. Transmembrane collagens are conserved not only in mammals but also in organisms such as C. elegans, where a single MACIT, COL-99, has been documented to function in motor innervation. Furthermore, in C. elegans, a collagen-like transmembrane protein, UNC-122, is implicated in the structural and functional integrity of the NMJ. This review article summarizes recent advances in understanding the roles of transmembrane collagens and underlying molecular mechanisms in multiple aspects of neuromuscular development and disorders.
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Affiliation(s)
- Tomoko Wakabayashi
- Department of Innovative Dementia Prevention, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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Nyström A, Kiritsi D. Transmembrane collagens-Unexplored mediators of epidermal-dermal communication and tissue homeostasis. Exp Dermatol 2020; 30:10-16. [PMID: 32869371 DOI: 10.1111/exd.14180] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 08/11/2020] [Accepted: 08/24/2020] [Indexed: 12/26/2022]
Abstract
Tissue homeostasis is maintained through constant, dynamic and heterogeneous communication between cells and their microenvironment. Proteins that are at the same time active at the intracellular, cell periphery and deeper extracellular levels possess the ability to, on the individual molecular level, influence the cells and their microenvironment in a bidirectional manner. The transmembrane collagens are a family of such proteins, which are of notable interest for tissue development and homeostasis. In skin, expression of all transmembrane collagens has been reported and deficiency of transmembrane collagen XVII manifests with distinct skin phenotypes. Nevertheless, transmembrane collagens in skin remain understudied despite the association of them with epidermal wound healing and dermal fibrotic processes. Here, we present an overview of transmembrane collagens and put a spotlight on them as regulators of epidermal-dermal communication and as potential players in fibrinogenesis.
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Affiliation(s)
- Alexander Nyström
- Department of Dermatology, Faculty of Medicine, Medical Center - University of Freiburg, Freiburg, Germany
| | - Dimitra Kiritsi
- Department of Dermatology, Faculty of Medicine, Medical Center - University of Freiburg, Freiburg, Germany
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Egli J, Siebler C, Köhler M, Zenobi R, Wennemers H. Hydrophobic Moieties Bestow Fast-Folding and Hyperstability on Collagen Triple Helices. J Am Chem Soc 2019; 141:5607-5611. [DOI: 10.1021/jacs.8b13871] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Jasmine Egli
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, Zurich 8093, Switzerland
| | - Christiane Siebler
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, Zurich 8093, Switzerland
| | - Martin Köhler
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, Zurich 8093, Switzerland
| | - Renato Zenobi
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, Zurich 8093, Switzerland
| | - Helma Wennemers
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, Zurich 8093, Switzerland
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Tu H, Huhtala P, Lee HM, Adams JC, Pihlajaniemi T. Membrane-associated collagens with interrupted triple-helices (MACITs): evolution from a bilaterian common ancestor and functional conservation in C. elegans. BMC Evol Biol 2015; 15:281. [PMID: 26667623 PMCID: PMC4678570 DOI: 10.1186/s12862-015-0554-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Accepted: 12/02/2015] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Collagens provide structural support and guidance cues within the extracellular matrix of metazoans. Mammalian collagens XIII, XXIII and XXV form a unique subgroup of type II transmembrane proteins, each comprising a short N-terminal cytosolic domain, a transmembrane domain and a largely collagenous ectodomain. We name these collagens as MACITs (Membrane-Associated Collagens with Interrupted Triple-helices), and here investigate their evolution and conserved properties. To date, these collagens have been studied only in mammals. Knowledge of the representation of MACITs in other extant metazoans is lacking. This question is of interest for understanding structural/functional relationships in the MACIT family and also for insight into the evolution of MACITs in relation to the secreted, fibrillar collagens that are present throughout the metazoa. RESULTS MACITs are restricted to bilaterians and are represented in the Ecdysozoa, Hemichordata, Urochordata and Vertebrata (Gnathostomata). They were not identified in available early-diverging metazoans, Lophotrochozoa, Echinodermata, Cephalochordata or Vertebrata (Cyclostomata). Whereas invertebrates encode a single MACIT, collagens XIII/XXIII/XXV of jawed vertebrates are paralogues that originated from the two rounds of en-bloc genome duplication occurring early in vertebrate evolution. MACITs have conserved domain architecture in which a juxta-membrane furin-cleavage site and the C-terminal 34 residues are especially highly conserved, whereas the cytoplasmic domains are weakly conserved. To study protein expression and function in a metazoan with a single MACIT gene, we focused on Caenorhabditis elegans and its col-99 gene. A col-99 cDNA was cloned and expressed as protein in mammalian CHO cells, two antibodies against COL-99 protein were generated, and a col-99-bearing fosmid gene construct col-99::egfp::flag was used to generate transgenic C. elegans lines. The encoded COL-99 polypeptide is 85 kDa in size and forms a trimeric protein. COL-99 is plasma membrane-associated and undergoes furin-dependent ectodomain cleavage and shedding. COL-99 is detected in mouth, pharynx, body wall and the tail, mostly in motor neurons and muscle systems and is enriched at neuromuscular junctions. CONCLUSIONS Through identification of MACITs in multiple metazoan phyla we developed a model for the evolution of MACITs. The experimental data demonstrate conservation of MACIT molecular and cellular properties and tissue localisations in the invertebrate, C. elegans.
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Affiliation(s)
- Hongmin Tu
- Centre of Excellence in Cell-Extracellular Matrix Research, Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, Aapistie 5, Oulu, FIN 90014, Finland.
| | - Pirkko Huhtala
- Centre of Excellence in Cell-Extracellular Matrix Research, Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, Aapistie 5, Oulu, FIN 90014, Finland.
| | - Hang-Mao Lee
- Centre of Excellence in Cell-Extracellular Matrix Research, Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, Aapistie 5, Oulu, FIN 90014, Finland.
| | - Josephine C Adams
- School of Biochemistry, University of Bristol, Biomedical Sciences Building, University Walk, Bristol, BS8 1TD, UK.
| | - Taina Pihlajaniemi
- Centre of Excellence in Cell-Extracellular Matrix Research, Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, Aapistie 5, Oulu, FIN 90014, Finland.
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Haglund L, Tillgren V, Önnerfjord P, Heinegård D. The C-terminal peptide of chondroadherin modulates cellular activity by selectively binding to heparan sulfate chains. J Biol Chem 2012; 288:995-1008. [PMID: 23172228 DOI: 10.1074/jbc.m112.430512] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Chondroadherin, a leucine-rich repeat family member, contains a very C-terminal sequence CKFPTKRSKKAGRH(359), now shown to bind to heparin with a K(D) of 13 μm. This observation led us to investigate whether chondroadherin interacts via this C-terminal heparin-binding domain with glycosaminoglycan chains of proteoglycans at the cell surface. Cells were shown to bind this heparin-binding peptide in FACS analysis, and the interaction was shown to be with glycosaminoglycans because it was abolished when sulfation was inhibited by chlorate treatment of the cells. In separate experiments, heparin and heparan sulfate inhibited the peptide interaction in a dose-dependent manner. Using a human chondrosarcoma and a murine osteoblast cell line, heparan sulfate proteoglycans were identified as the cell surface receptors involved in the binding. Different binding syndecans were identified in the two different cell lines, indicating that the same protein core of a proteoglycan may have structural and functional differences in the attached heparan sulfate chains. Upon binding to coated peptide, cells spread, demonstrating engagement of the cytoskeleton, but no focal adhesion complex was formed. The number of cells adhering via their β(1) integrin receptor to collagen type II or chondroadherin was profoundly and rapidly enhanced by the addition of the heparin-binding peptide. The peptide added to the cells caused ERK phosphorylation, showing that it triggered intracellular signaling. The results show that heparan sulfate chains differ between various members of the proteoglycan families on a given cell, but also differ between the same proteoglycan on different cells with a potential for differential regulation of cellular activities.
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Affiliation(s)
- Lisbet Haglund
- Department of Clinical Sciences, Lund, Section of Rheumatology, Molecular Skeletal Biology, Biomedical Center C12, Lund University, SE-22184 Lund, Sweden
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Ivanova VP, Krivchenko AI. A current viewpoint on structure and evolution of collagens. I. Fibrillar collagens. J EVOL BIOCHEM PHYS+ 2012. [DOI: 10.1134/s0022093012020016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Muscle-derived collagen XIII regulates maturation of the skeletal neuromuscular junction. J Neurosci 2010; 30:12230-41. [PMID: 20844119 DOI: 10.1523/jneurosci.5518-09.2010] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Formation, maturation, stabilization, and functional efficacy of the neuromuscular junction (NMJ) are orchestrated by transsynaptic and autocrine signals embedded within the synaptic cleft. Here, we demonstrate that collagen XIII, a nonfibrillar transmembrane collagen, is another such signal. We show that collagen XIII is expressed by muscle and its ectodomain can be proteolytically shed into the extracellular matrix. The collagen XIII protein was found present in the postsynaptic membrane and synaptic basement membrane. To identify a role for collagen XIII at the NMJ, mice were generated lacking this collagen. Morphological and ultrastructural analysis of the NMJ revealed incomplete adhesion of presynaptic and postsynaptic specializations in collagen XIII-deficient mice of both genders. Strikingly, Schwann cells erroneously enwrapped nerve terminals and invaginated into the synaptic cleft, resulting in a decreased contact surface for neurotransmission. Consistent with morphological findings, electrophysiological studies indicated both postsynaptic and presynaptic defects in Col13a1(-/-) mice, such as decreased amplitude of postsynaptic potentials, diminished probabilities of spontaneous release and reduced readily releasable neurotransmitter pool. To identify the role of collagen XIII at the NMJ, shed ectodomain of collagen XIII was applied to cultured myotubes, and it was found to advance acetylcholine receptor (AChR) cluster maturation. Together with the delay in AChR cluster development observed in collagen XIII-deficient mutants in vivo, these results suggest that collagen XIII plays an autocrine role in postsynaptic maturation of the NMJ. Altogether, the results presented here reveal that collagen XIII is a novel muscle-derived cue necessary for the maturation and function of the vertebrate NMJ.
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Yu Z, Mirochnitchenko O, Xu C, Yoshizumi A, Brodsky B, Inouye M. Noncollagenous region of the streptococcal collagen-like protein is a trimerization domain that supports refolding of adjacent homologous and heterologous collagenous domains. Protein Sci 2010; 19:775-85. [PMID: 20162611 DOI: 10.1002/pro.356] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Proper folding of the (Gly-Xaa-Yaa)(n) sequence of animal collagens requires adjacent N- or C-terminal noncollagenous trimerization domains which often contain coiled-coil or beta sheet structure. Collagen-like proteins have been found recently in a number of bacteria, but little is known about their folding mechanism. The Scl2 collagen-like protein from Streptococcus pyogenes has an N-terminal globular domain, designated V(sp), adjacent to its triple-helix domain. The V(sp) domain is required for proper refolding of the Scl2 protein in vitro. Here, recombinant V(sp) domain alone is shown to form trimers with a significant alpha-helix content and to have a thermal stability of T(m) = 45 degrees C. Examination of a new construct shows that the V(sp) domain facilitates efficient in vitro refolding only when it is located N-terminal to the triple-helix domain but not when C-terminal to the triple-helix domain. Fusion of the V(sp) domain N-terminal to a heterologous (Gly-Xaa-Yaa)(n) sequence from Clostridium perfringens led to correct folding and refolding of this triple-helix, which was unable to fold into a triple-helical, soluble protein on its own. These results suggest that placement of a functional trimerization module adjacent to a heterologous Gly-Xaa-Yaa repeating sequence can lead to proper folding in some cases but also shows specificity in the relative location of the trimerization and triple-helix domains. This information about their modular nature can be used in the production of novel types of bacterial collagen for biomaterial applications.
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Affiliation(s)
- Zhuoxin Yu
- Department of Biochemistry, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, Piscataway, New Jersey 08854, USA
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Jäälinoja J, Ylöstalo J, Beckett W, Hulmes DJS, Ala-Kokko L. Trimerization of collagen IX alpha-chains does not require the presence of the COL1 and NC1 domains. Biochem J 2008; 409:545-54. [PMID: 17880280 DOI: 10.1042/bj20070984] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Collagen IX is a heterotrimer of three alpha-chains, which consists of three COL domains (collagenous domains) (COL1-COL3) and four NC domains (non-collagenous domains) (NC1-NC4), numbered from the C-terminus. Although collagen IX chains have been shown to associate via their C-terminal NC1 domains and form a triple helix starting from the COL1 domain, it is not known whether chain association can occur at other sites and whether other collagenous and non-collagenous regions are involved. To address this question, we prepared five constructs, two long variants (beginning at the NC4 domain) and three short variants (beginning at the COL2 domain), all ending at the NC2 domain (or NC2 replaced by NC1), to study association and selection of collagen IX alpha-chains. Both long variants were able to associate with NC1 or NC2 at the C-terminus and form various disulfide-bonded trimers, but the specificity of chain selection was diminished compared with full-length chains. Trimers of the long variant ending at NC2 were shown to be triple helical by CD. Short variants were not able to assemble into disulfide-bonded trimers even in the presence of both conserved cysteine residues from the COL1-NC1 junction. Our results demonstrate that collagen IX alpha-chains can associate in the absence of COL1 and NC1 domains to form a triple helix, but the COL2-NC2 region alone is not sufficient for trimerization. The results suggest that folding of collagen IX is a co-operative process involving multiple COL and NC domains and that the COL1-NC1 region is important for chain specificity.
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Affiliation(s)
- Juha Jäälinoja
- Collagen Research Unit, Biocenter and Department of Medical Biochemistry and Molecular Biology, Oulu University, P.O. Box 5000, 90014 Oulu, Finland
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Terentiev AA, Moldogazieva NT. Cell adhesion proteins and α-fetoprotein. Similar structural motifs as prerequisites for common functions. BIOCHEMISTRY (MOSCOW) 2007; 72:920-35. [DOI: 10.1134/s0006297907090027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Eshed Y, Feinberg K, Carey DJ, Peles E. Secreted gliomedin is a perinodal matrix component of peripheral nerves. ACTA ACUST UNITED AC 2007; 177:551-62. [PMID: 17485493 PMCID: PMC2064815 DOI: 10.1083/jcb.200612139] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The interaction between gliomedin and the axonodal cell adhesion molecules (CAMs) neurofascin and NrCAM induces the clustering of Na+ channels at the nodes of Ranvier. We define new interactions of gliomedin that are essential for its clustering activity. We show that gliomedin exists as both transmembrane and secreted forms that are generated by proteolytic cleavage of the protein, and that only the latter is detected at the nodes of Ranvier. The secreted extracellular domain of gliomedin binds to Schwann cells and is incorporated into the extracellular matrix (ECM) in a heparin-dependent manner, suggesting the involvement of heparan sulfate proteoglycans (HSPGs). Furthermore, we show that the N-terminal region of gliomedin serves as an oligomerization domain that mediates self-association of the molecule, which is required for its binding to neurofascin and NrCAM. Our results indicate that the deposition of gliomedin multimers at the nodal gap by binding to HSPGs facilitates the clustering of the axonodal CAMs and Na+ channels.
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Affiliation(s)
- Yael Eshed
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot, Israel
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17
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Snellman A, Tuomisto A, Koski A, Latvanlehto A, Pihlajaniemi T. The Role of Disulfide Bonds and α-Helical Coiled-coils in the Biosynthesis of Type XIII Collagen and Other Collagenous Transmembrane Proteins. J Biol Chem 2007; 282:14898-905. [PMID: 17344215 DOI: 10.1074/jbc.m609605200] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Type XIII collagen is a type II transmembrane protein with three collagenous (COL1-3) and four noncollagenous domains (NC1-4). The human alpha1(XIII) chain contains altogether eight cysteine residues. We introduced point mutations to six of the most N-terminal cysteine residues, and we show here that the two cysteines 117 and 119 at the end of the N-terminal noncollagenous domain (NC1) are responsible for linking the three alpha1(XIII) chains together by means of interchain disulfide bonds. In addition, the intracellular and transmembrane domains have an impact on trimer formation, whereas the cysteines in the transmembrane domain and the COL1, the NC2, and the C-terminal NC4 domains do not affect trimer formation. We also suggest that the first three noncollagenous domains (NC1-3) harbor repeating heptad sequences typical of alpha-helical coiled-coils, whereas the conserved NC4 lacks a coiled-coil probability. Prevention of the coiled-coil conformation in the NC3 domain is shown here to result in labile type XIII collagen molecules. Furthermore, a new subgroup of collagenous transmembrane proteins, the Rattus norvegicus, Drosophila melanogaster, and Caenorhabditis elegans colmedins, is enlarged to contain also Homo sapiens collomin, and Pan troglodytes, Mus musculus, Tetraodon nigroviridis, and Dano rerio proteins. We suggest that there is a structurally varied group of collagenous transmembrane proteins whose biosynthesis is characterized by a coiled-coil motif following the transmembrane domain, and that these trimerization domains appear to be associated with each of the collagenous domains. In the case of type XIII collagen, the trimeric molecule has disulfide bonds at the junction of the NC1 and COL1 domains, and the type XIII collagen-like molecules (collagen types XXIII and XXV) and the colmedins are similar in that they all have a pair of cysteines in the same location. Moreover, furin cleavage at the NC1 domain can be expected in most of the proteins.
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Affiliation(s)
- Anne Snellman
- Collagen Research Unit, Biocenter Oulu and Department of Medical Biochemistry and Molecular Biology, University of Oulu, PO Box 5000, FIN-90014 Oulu, Finland
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18
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Maertens B, Hopkins D, Franzke CW, Keene DR, Bruckner-Tuderman L, Greenspan DS, Koch M. Cleavage and oligomerization of gliomedin, a transmembrane collagen required for node of ranvier formation. J Biol Chem 2007; 282:10647-59. [PMID: 17293346 DOI: 10.1074/jbc.m611339200] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Gliomedin, which has been implicated as a major player in genesis of the nodes of Ranvier, contains two collagenous domains and an olfactomedin-like domain and belongs to the group of type II transmembrane collagens that includes collagens XIII and XVII and ectodysplasin A. One characteristic of this protein family is that constituent proteins can exist in both transmembrane and soluble forms. Recently, gliomedin expressed at the tips of Schwann cell microvilli was found to bind axonal adhesion molecules neurofascin and NrCAM in interactions essential for Na(+)-channel clustering at the nodes of Ranvier in myelinating peripheral nerves. Interestingly, exogenously added olfactomedin domain was found to have the same effect as intact gliomedin. Here we analyze the tissue form of gliomedin and demonstrate that the molecule not only exists as full-length gliomedin but also as a soluble form shed from the cell surface in a furin-dependent manner. In addition, gliomedin can be further proteolytically processed by bone morphogenetic protein 1/Tolloid-like enzymes, resulting in release of the olfactomedin domain from the collagen domains. Interestingly, the later cleavage induces formation of higher order, insoluble molecular aggregates that may play important roles in Na(+)-channel clustering.
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Affiliation(s)
- Barbara Maertens
- Center for Biochemistry, Medical Faculty, University of Cologne, D-50931 Cologne, Germany
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19
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Koch M, Veit G, Stricker S, Bhatt P, Kutsch S, Zhou P, Reinders E, Hahn RA, Song R, Burgeson RE, Gerecke DR, Mundlos S, Gordon MK. Expression of type XXIII collagen mRNA and protein. J Biol Chem 2006; 281:21546-21557. [PMID: 16728390 DOI: 10.1074/jbc.m604131200] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Collagen XXIII is a member of the transmembranous subfamily of collagens containing a cytoplasmic domain, a membrane-spanning hydrophobic domain, and three extracellular triple helical collagenous domains interspersed with non-collagenous domains. We cloned mouse, chicken, and humanalpha1(XXIII) collagen cDNAs and showed that this non-abundant collagen has a limited tissue distribution in non-tumor tissues. Lung, cornea, brain, skin, tendon, and kidney are the major sites of expression. In contrast, five transformed cell lines were tested for collagen XXIII expression, and all expressed the mRNA. In vivo the alpha1(XXIII) mRNA is found in mature and developing organs, the latter demonstrated using stages of embryonic chick cornea and mouse embryos. Polyclonal antibodies were generated in guinea pig and rabbit and showed that collagen XXIII has a transmembranous form and a shed form. Comparison of collagen XXIII with its closest relatives in the transmembranous subfamily of collagens, types XIII and XXV, which have the same number of triple helical and non-collagenous regions, showed that there is a discontinuity in the alignment of domains but that striking similarities remain despite this.
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Affiliation(s)
- Manuel Koch
- Center for Biochemistry, University of Cologne, Joseph-Stelzmann Strasse 52, 50931 Cologne, Germany; Department of Dermatology, University of Cologne, Joseph-Stelzmann Strasse 52, 50931 Cologne, Germany; Center for Molecular Medicine Cologne, University of Cologne, Joseph-Stelzmann Strasse 52, 50931 Cologne, Germany
| | - Guido Veit
- Center for Biochemistry, University of Cologne, Joseph-Stelzmann Strasse 52, 50931 Cologne, Germany
| | - Sigmar Stricker
- Development and Disease Group, Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany
| | - Pinaki Bhatt
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy and the Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey 08854
| | - Stefanie Kutsch
- Center for Biochemistry, University of Cologne, Joseph-Stelzmann Strasse 52, 50931 Cologne, Germany
| | - Peihong Zhou
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy and the Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey 08854
| | - Elina Reinders
- Center for Biochemistry, University of Cologne, Joseph-Stelzmann Strasse 52, 50931 Cologne, Germany
| | - Rita A Hahn
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy and the Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey 08854
| | - Rich Song
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy and the Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey 08854
| | - Robert E Burgeson
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy and the Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey 08854
| | - Donald R Gerecke
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy and the Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey 08854
| | - Stefan Mundlos
- Development and Disease Group, Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany; Institute for Medical Genetics, University Medicine Charité, 13353 Berlin, Germany
| | - Marion K Gordon
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy and the Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey 08854.
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Kammerer RA, Kostrewa D, Progias P, Honnappa S, Avila D, Lustig A, Winkler FK, Pieters J, Steinmetz MO. A conserved trimerization motif controls the topology of short coiled coils. Proc Natl Acad Sci U S A 2005; 102:13891-6. [PMID: 16172398 PMCID: PMC1236532 DOI: 10.1073/pnas.0502390102] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In recent years, short coiled coils have been used for applications ranging from biomaterial to medical sciences. For many of these applications knowledge of the factors that control the topology of the engineered protein systems is essential. Here, we demonstrate that trimerization of short coiled coils is determined by a distinct structural motif that encompasses specific networks of surface salt bridges and optimal hydrophobic packing interactions. The motif is conserved among intracellular, extracellular, viral, and synthetic proteins and defines a universal molecular determinant for trimer formation of short coiled coils. In addition to being of particular interest for the biotechnological production of candidate therapeutic proteins, these findings may be of interest for viral drug development strategies.
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Affiliation(s)
- Richard A Kammerer
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 PT, United Kingdom
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21
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Moroder L, Musiol HJ, Götz M, Renner C. Synthesis of single- and multiple-stranded cystine-rich peptides. Biopolymers 2005; 80:85-97. [PMID: 15612050 DOI: 10.1002/bip.20174] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The large abundance of bioactive single- and multiple-stranded cystine-rich peptides in nature has fostered the development of orthogonal thiol-protection schemes and of efficient chemistries for regioselective disulfide formation in synthetic replica for decades. In parallel to these entirely synthetic strategies, an increased knowledge of oxidative refolding mechanisms of proteins has been accumulated, and the collective experience with air oxidation of cysteine-rich peptides into their native disulfide frameworks have largely confirmed Anfinsen's principle of the self-assembly of polypeptide chains. In fact, a continuously growing number of cysteine-rich bioactive peptides from the most diverse sources and with differing cysteine patterns were found to retain the critical sequence-encoded structural information for correct oxidative folding into the native structures as dominant isomers, although in the biosynthetic pathways the mature peptide forms are mostly generated by posttranslational processing of folded precursors. Such self-assembly processes can be optimized by opportune manipulation of the experimental conditions or by induction of productive intermediates. But there are also numerous cases where folding and disulfide formation are thermodynamically not coupled and where the application of a defined succession of regioselective cysteine pairings still represents the method of choice to install the desired native or non-native cystine frameworks. Among our contributions to the state of the art in the synthesis of cystine-rich peptides, we have mainly addressed the induction of correct oxidative refolding of single-stranded cysteine-rich peptides into their native structures by the use of selenocysteine and suitable strategies for disulfide-mediated assembly of monomers into defined oligomers as mimics of homo- and heterotrimeric collagens as a synthetic approach for the development of new biomaterials.
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Affiliation(s)
- Luis Moroder
- Max-Planck Institute of Biochemistry, 82152 Martinsried, Germany.
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22
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Abstract
Collagen fibrils in the extracellular matrix allow connective tissues such as tendon, skin and bone to withstand tensile forces. The fibrils are indeterminate in length, insoluble and form elaborate three-dimensional arrays that extend over numerous cell lengths. Studies of the molecular basis of collagen fibrillogenesis have provided insight into the trafficking of procollagen (the precursor of collagen) through the cellular secretory pathway, the conversion of procollagen to collagen by the procollagen metalloproteinases, and the directional deposition of fibrils involving the plasma membrane and late secretory pathway. Fibril-associated molecules are targeted to the surface of collagen fibrils, and these molecules play an important role in regulating the diameter and interactions between the fibrils.
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Affiliation(s)
- Elizabeth G Canty
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, The University of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK.
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23
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Franzke CW, Bruckner P, Bruckner-Tuderman L. Collagenous transmembrane proteins: recent insights into biology and pathology. J Biol Chem 2005; 280:4005-8. [PMID: 15561712 DOI: 10.1074/jbc.r400034200] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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24
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Ricard-Blum S, Ruggiero F. The collagen superfamily: from the extracellular matrix to the cell membrane. ACTA ACUST UNITED AC 2005; 53:430-42. [PMID: 16085121 DOI: 10.1016/j.patbio.2004.12.024] [Citation(s) in RCA: 213] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2004] [Accepted: 12/10/2004] [Indexed: 12/17/2022]
Abstract
The collagen superfamily is highly complex and shows a remarkable diversity in molecular and supramolecular organization, tissue distribution and function. However, all its members share a common structural feature, the presence of at least one triple-helical domain, which corresponds to a number of (Gly-X-Y)n repeats (X being frequently proline and Y hydroxyproline) in the amino acid sequence. Several sub-families have been determined according to sequence homologies and to similarities in the structural organization and supramolecular assembly. In the present review, we focus on the newly described fibrillar collagens, fibrillar-associated collagens with interrupted triple helix, membrane collagens and multiplexins. Recent advances in the characterization of proteins containing triple-helical domains but not referred to as collagens are also discussed.
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Affiliation(s)
- Sylvie Ricard-Blum
- Institut de Biologie et Chimie des Protéines, UMR 5086 CNRS UCBL, IFR128 Biosciences Gerland, Lyon, France.
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25
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Osada Y, Hashimoto T, Nishimura A, Matsuo Y, Wakabayashi T, Iwatsubo T. CLAC binds to amyloid beta peptides through the positively charged amino acid cluster within the collagenous domain 1 and inhibits formation of amyloid fibrils. J Biol Chem 2004; 280:8596-605. [PMID: 15615705 DOI: 10.1074/jbc.m413340200] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
CLAC (collagenous Alzheimer amyloid plaque component) is a proteolytic fragment derived from a novel membrane-bound collagen, CLAC-P/collagen type XXV, that deposits in senile plaques associated with amyloid beta peptides (Abeta) in the brains of patients with Alzheimer's disease. We previously showed that CLAC binds to the fibrillized form of Abeta in vitro, although the mechanism and the subdomains that mediate interaction of CLAC with Abeta as well as the effect of binding of CLAC on amyloid fibril formation remain unknown. Here we show that the collagenous domain 1 of CLAC, which is rich in positively charged amino acid residues, mediates its interaction with Abeta and that this binding is mediated by an electrostatic interaction and requires formation of the triple helix structure of CLAC. The soluble form of CLAC purified from the media of cells transfected with CLAC-P inhibited fibrillization of Abeta in vitro, especially in its elongation phase. These results suggest the anti-amyloidogenic roles of CLAC in the pathophysiology of Alzheimer's disease.
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Affiliation(s)
- Yoshihide Osada
- Department of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo Bunkyoku Tokyo, 113-0033, Japan
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26
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Söderberg L, Kakuyama H, Möller A, Ito A, Winblad B, Tjernberg LO, Näslund J. Characterization of the Alzheimer's disease-associated CLAC protein and identification of an amyloid beta-peptide-binding site. J Biol Chem 2004; 280:1007-15. [PMID: 15522881 DOI: 10.1074/jbc.m403628200] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Amyloid beta-peptide (Abeta) deposition into amyloid plaques is one of the invariant neuropathological features of Alzheimer's disease. Other proteins co-deposit with Abeta in plaques, and one recently identified amyloid-associated protein is the collagen-like Alzheimer amyloid plaque component CLAC. It is not known how CLAC deposition affects Abeta plaque genesis and the progress of the disease. Here, we studied the in vitro properties of CLAC purified from a mammalian expression system. CLAC displays features characteristic of a collagen protein, e.g. it forms a partly protease-resistant triple-helical structure, exhibits an intermediate affinity for heparin, and is glycosylated. Purified CLAC was also used to investigate the interaction between CLAC and Abeta. Using a solid-phase binding assay, we show that CLAC bound with a similar affinity to aggregates formed by Abeta-(1-40) and Abeta-(1-42) and that the interaction was impaired by increasing salt concentrations. An 8-residue-long sequence located in non-collagenous domain 2 of CLAC was found to be crucial for the interaction with Abeta. These findings may be useful for future therapeutic interventions aimed at finding compounds that modulate the binding of CLAC to Abeta deposits.
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Affiliation(s)
- Linda Söderberg
- Karolinska Institutet and Sumitomo Pharmaceuticals Alzheimer Center, Neurotec, Novum, SE-141 57 Huddinge, Sweden.
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27
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McAlinden A, Smith TA, Sandell LJ, Ficheux D, Parry DAD, Hulmes DJS. Alpha-helical coiled-coil oligomerization domains are almost ubiquitous in the collagen superfamily. J Biol Chem 2003; 278:42200-7. [PMID: 12920133 DOI: 10.1074/jbc.m302429200] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Alpha-helical coiled-coils are widely occurring protein oligomerization motifs. Here we show that most members of the collagen superfamily contain short, repeating heptad sequences typical of coiled coils. Such sequences are found at the N-terminal ends of the C-propeptide domains in all fibrillar procollagens. When fused C-terminal to a reporter molecule containing a collagen-like sequence that does not spontaneously trimerize, the C-propeptide heptad repeats induced trimerization. C-terminal heptad repeats were also found in the oligomerization domains of the multiplexins (collagens XV and XVIII). N-terminal heptad repeats are known to drive trimerization in transmembrane collagens, whereas fibril-associated collagens with interrupted triple helices, as well as collagens VII, XIII, XXIII, and XXV, were found to contain heptad repeats between collagen domains. Finally, heptad repeats were found in the von Willebrand factor A domains known to be involved in trimerization of collagen VI, as well as in collagen VII. These observations suggest that coiled-coil oligomerization domains are widely used in the assembly of collagens and collagen-like proteins.
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Affiliation(s)
- Audrey McAlinden
- Department of Orthopedic Surgery, Washington University School of Medicine, Barnes-Jewish Hospital, St. Louis, MO 63110, USA
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28
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Elamaa H, Snellman A, Rehn M, Autio-Harmainen H, Pihlajaniemi T. Characterization of the human type XVIII collagen gene and proteolytic processing and tissue location of the variant containing a frizzled motif. Matrix Biol 2003; 22:427-42. [PMID: 14614989 DOI: 10.1016/s0945-053x(03)00073-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Human type XVIII collagen was found to be expressed as three variants, termed NC1-303, NC1-493 and NC1-728, differing in their N-terminal non-collagenous domains (NC1). The corresponding gene was found to be approximately 105 kb in size and contain 43 exons. The short variant is derived from utilization of an upstream promoter associated with the first two exons of the gene. The two other variants are derived from a downstream promoter and alternative splicing of exon 3, resulting in 192 residues of shared sequences characterized by a putative approximately 30 residue conserved coiled-coil motif and 235 residues of sequences specific to NC1-728. The NC1-728 variant has a conserved cysteine-rich domain homologous with the ligand-binding part of the frizzled proteins. A polyclonal antibody specific to the NC1-728 variant was generated, and immunostaining of fetal tissues revealed staining in lung and skeletal muscle. Human serum contained 173- and 144-kDa alpha1(XVIII) chains corresponding to the NC1-728 and NC1-493 variants, respectively. A 200-kDa polypeptide was detected in cells transfected with a cDNA construct corresponding to the full-length NC1-728 variant, and EBNA-293 cells endogenously synthesizing low amounts of type XVIII collagen had a 45-kDa fragment in their culture medium that corresponded to most of the NC1 domain of the NC1-728 variant, suggesting processing of the N-terminal frizzled-containing domain.
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Affiliation(s)
- Harri Elamaa
- Collagen Research Unit, Biocenter Oulu, Department of Medical Biochemistry and Molecular Biology, University of Oulu, P.O. Box 5000, Oulu 90014, Finland
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