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  • 1
    Publication Date: 2008-03-14
    Description: The autosomal dominant hyper-IgE syndrome (HIES, 'Job's syndrome') is characterized by recurrent and often severe pulmonary infections, pneumatoceles, eczema, staphylococcal abscesses, mucocutaneous candidiasis, and abnormalities of bone and connective tissue. Mutations presumed to underlie HIES have recently been identified in stat3, the gene encoding STAT3 (signal transducer and activator of transcription 3) (refs 3, 4). Although impaired production of interferon-gamma and tumour-necrosis factor by T cells, diminished memory T-cell populations, decreased delayed-type-hypersensitivity responses and decreased in vitro lymphoproliferation in response to specific antigens have variably been described, specific immunological abnormalities that can explain the unique susceptibility to particular infections seen in HIES have not yet been defined. Here we show that interleukin (IL)-17 production by T cells is absent in HIES individuals. We observed that ex vivo T cells from subjects with HIES failed to produce IL-17, but not IL-2, tumour-necrosis factor or interferon-gamma, on mitogenic stimulation with staphylococcal enterotoxin B or on antigenic stimulation with Candida albicans or streptokinase. Purified naive T cells were unable to differentiate into IL-17-producing (T(H)17) T helper cells in vitro and had lower expression of retinoid-related orphan receptor (ROR)-gammat, which is consistent with a crucial role for STAT3 signalling in the generation of T(H)17 cells. T(H)17 cells have emerged as an important subset of helper T cells that are believed to be critical in the clearance of fungal and extracellular bacterial infections. Thus, our data suggest that the inability to produce T(H)17 cells is a mechanism underlying the susceptibility to the recurrent infections commonly seen in HIES.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2864108/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2864108/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Milner, Joshua D -- Brenchley, Jason M -- Laurence, Arian -- Freeman, Alexandra F -- Hill, Brenna J -- Elias, Kevin M -- Kanno, Yuka -- Spalding, Christine -- Elloumi, Houda Z -- Paulson, Michelle L -- Davis, Joie -- Hsu, Amy -- Asher, Ava I -- O'Shea, John -- Holland, Steven M -- Paul, William E -- Douek, Daniel C -- Z99 AI999999/Intramural NIH HHS/ -- England -- Nature. 2008 Apr 10;452(7188):773-6. doi: 10.1038/nature06764. Epub 2008 Mar 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Immunology, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18337720" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Candida albicans/immunology ; *Cell Differentiation ; Child ; Child, Preschool ; Enterotoxins/immunology ; Female ; *Genes, Dominant ; Humans ; Interferon-gamma/biosynthesis/immunology ; Interleukin-17/*biosynthesis ; Interleukin-2/biosynthesis/immunology ; Job Syndrome/genetics/*immunology/metabolism/*pathology ; Male ; Middle Aged ; Streptokinase/metabolism ; T-Lymphocytes, Helper-Inducer/immunology/*metabolism/*pathology ; Tumor Necrosis Factor-alpha/biosynthesis/immunology
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  • 2
    Publication Date: 2008-04-25
    Description: The cellular machinery promoting phagocytosis of corpses of apoptotic cells is well conserved from worms to mammals. An important component is the Caenorhabditis elegans engulfment receptor CED-1 (ref. 1) and its Drosophila orthologue, Draper. The CED-1/Draper signalling pathway is also essential for the phagocytosis of other types of 'modified self' including necrotic cells, developmentally pruned axons and dendrites, and axons undergoing Wallerian degeneration. Here we show that Drosophila Shark, a non-receptor tyrosine kinase similar to mammalian Syk and Zap-70, binds Draper through an immunoreceptor tyrosine-based activation motif (ITAM) in the Draper intracellular domain. We show that Shark activity is essential for Draper-mediated signalling events in vivo, including the recruitment of glial membranes to severed axons and the phagocytosis of axonal debris and neuronal cell corpses by glia. We also show that the Src family kinase (SFK) Src42A can markedly increase Draper phosphorylation and is essential for glial phagocytic activity. We propose that ligand-dependent Draper receptor activation initiates the Src42A-dependent tyrosine phosphorylation of Draper, the association of Shark and the activation of the Draper pathway. These Draper-Src42A-Shark interactions are strikingly similar to mammalian immunoreceptor-SFK-Syk signalling events in mammalian myeloid and lymphoid cells. Thus, Draper seems to be an ancient immunoreceptor with an extracellular domain tuned to modified self, and an intracellular domain promoting phagocytosis through an ITAM-domain-SFK-Syk-mediated signalling cascade.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2493287/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2493287/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ziegenfuss, Jennifer S -- Biswas, Romi -- Avery, Michelle A -- Hong, Kyoungja -- Sheehan, Amy E -- Yeung, Yee-Guide -- Stanley, E Richard -- Freeman, Marc R -- 1R01CA26504/CA/NCI NIH HHS/ -- 1R01GM55293/GM/NIGMS NIH HHS/ -- 1R01NS053538/NS/NINDS NIH HHS/ -- R37 CA026504/CA/NCI NIH HHS/ -- R37 CA026504-30/CA/NCI NIH HHS/ -- England -- Nature. 2008 Jun 12;453(7197):935-9. doi: 10.1038/nature06901. Epub 2008 Apr 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, University of Massachusetts Medical School, 364 Plantation Street, Worcester, Massachusetts 01605-2324, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18432193" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Animals ; Axons/metabolism/pathology ; Cell Line ; Cell Membrane/metabolism ; Central Nervous System ; Drosophila Proteins/chemistry/*metabolism ; Intracellular Signaling Peptides and Proteins/*metabolism ; Membrane Proteins/chemistry/*metabolism ; Neuroglia/*cytology ; *Phagocytosis ; Phosphorylation ; Protein Binding ; Protein Structure, Tertiary ; Protein Transport ; Protein-Tyrosine Kinases/*metabolism ; Proto-Oncogene Proteins pp60(c-src)/*metabolism ; *Signal Transduction ; Two-Hybrid System Techniques
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2008-08-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Freeman, Benny -- England -- Nature. 2008 Aug 7;454(7205):671. doi: 10.1038/454671e.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Texas at Austin, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18685654" target="_blank"〉PubMed〈/a〉
    Keywords: Hepatitis B virus/isolation & purification ; Humans ; *Membranes, Artificial ; Polymers/chemistry ; *Porosity ; Water Purification/economics/instrumentation
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  • 4
    Publication Date: 2009-05-15
    Description: Biomechanical forces are emerging as critical regulators of embryogenesis, particularly in the developing cardiovascular system. After initiation of the heartbeat in vertebrates, cells lining the ventral aspect of the dorsal aorta, the placental vessels, and the umbilical and vitelline arteries initiate expression of the transcription factor Runx1 (refs 3-5), a master regulator of haematopoiesis, and give rise to haematopoietic cells. It remains unknown whether the biomechanical forces imposed on the vascular wall at this developmental stage act as a determinant of haematopoietic potential. Here, using mouse embryonic stem cells differentiated in vitro, we show that fluid shear stress increases the expression of Runx1 in CD41(+)c-Kit(+) haematopoietic progenitor cells, concomitantly augmenting their haematopoietic colony-forming potential. Moreover, we find that shear stress increases haematopoietic colony-forming potential and expression of haematopoietic markers in the para-aortic splanchnopleura/aorta-gonads-mesonephros of mouse embryos and that abrogation of nitric oxide, a mediator of shear-stress-induced signalling, compromises haematopoietic potential in vitro and in vivo. Collectively, these data reveal a critical role for biomechanical forces in haematopoietic development.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2782763/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2782763/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Adamo, Luigi -- Naveiras, Olaia -- Wenzel, Pamela L -- McKinney-Freeman, Shannon -- Mack, Peter J -- Gracia-Sancho, Jorge -- Suchy-Dicey, Astrid -- Yoshimoto, Momoko -- Lensch, M William -- Yoder, Mervin C -- Garcia-Cardena, Guillermo -- Daley, George Q -- R01 AI080759/AI/NIAID NIH HHS/ -- R01 AI080759-01/AI/NIAID NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 Jun 25;459(7250):1131-5. doi: 10.1038/nature08073. Epub 2009 May 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19440194" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aorta/cytology/embryology ; *Cell Differentiation ; Cell Line ; Cells, Cultured ; Core Binding Factor Alpha 2 Subunit/genetics ; Embryonic Stem Cells ; Endothelium-Dependent Relaxing Factors/pharmacology ; Female ; Gene Expression Regulation, Developmental ; Hematopoiesis/*physiology ; Hematopoietic Stem Cells/*cytology/drug effects ; Mice ; Nitric Oxide/pharmacology ; Pregnancy ; *Stress, Mechanical
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2008-12-17
    Description: Chronic immunodeficiency virus infections are characterized by dysfunctional cellular and humoral antiviral immune responses. As such, immune modulatory therapies that enhance and/or restore the function of virus-specific immunity may protect from disease progression. Here we investigate the safety and immune restoration potential of blockade of the co-inhibitory receptor programmed death 1 (PD-1) during chronic simian immunodeficiency virus (SIV) infection in macaques. We demonstrate that PD-1 blockade using an antibody to PD-1 is well tolerated and results in rapid expansion of virus-specific CD8 T cells with improved functional quality. This enhanced T-cell immunity was seen in the blood and also in the gut, a major reservoir of SIV infection. PD-1 blockade also resulted in proliferation of memory B cells and increases in SIV envelope-specific antibody. These improved immune responses were associated with significant reductions in plasma viral load and also prolonged the survival of SIV-infected macaques. Blockade was effective during the early (week 10) as well as late ( approximately week 90) phases of chronic infection even under conditions of severe lymphopenia. These results demonstrate enhancement of both cellular and humoral immune responses during a pathogenic immunodeficiency virus infection by blocking a single inhibitory pathway and identify a novel therapeutic approach for control of human immunodeficiency virus infections.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2753387/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2753387/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Velu, Vijayakumar -- Titanji, Kehmia -- Zhu, Baogong -- Husain, Sajid -- Pladevega, Annette -- Lai, Lilin -- Vanderford, Thomas H -- Chennareddi, Lakshmi -- Silvestri, Guido -- Freeman, Gordon J -- Ahmed, Rafi -- Amara, Rama Rao -- P30 AI050409/AI/NIAID NIH HHS/ -- P51 RR00165/RR/NCRR NIH HHS/ -- R01 AI057029/AI/NIAID NIH HHS/ -- R01 AI057029-01/AI/NIAID NIH HHS/ -- R01 AI057029-02/AI/NIAID NIH HHS/ -- R01 AI057029-03/AI/NIAID NIH HHS/ -- R01 AI057029-04/AI/NIAID NIH HHS/ -- R01 AI057029-05/AI/NIAID NIH HHS/ -- R01 AI071852/AI/NIAID NIH HHS/ -- R01 AI074417/AI/NIAID NIH HHS/ -- R01 AI074417-01A1/AI/NIAID NIH HHS/ -- R01 AI074417-02/AI/NIAID NIH HHS/ -- R24 RR16038/RR/NCRR NIH HHS/ -- England -- Nature. 2009 Mar 12;458(7235):206-10. doi: 10.1038/nature07662. Epub 2008 Dec 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Emory Vaccine Center, Emory University School of Medicine, Atlanta, Georgia 30322, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19078956" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/administration & dosage/*metabolism/pharmacology ; Antibodies, Viral/blood ; Antibody Formation/drug effects/immunology ; Apoptosis Regulatory Proteins/*metabolism ; CD8-Positive T-Lymphocytes ; Gene Products, gag/blood ; Immunity, Innate/*drug effects ; Intestines/drug effects/immunology ; Macaca mulatta ; Molecular Sequence Data ; Simian Acquired Immunodeficiency Syndrome/*immunology ; Simian Immunodeficiency Virus/*immunology ; Survival Analysis ; Viremia/immunology
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  • 6
    Publication Date: 2010-06-26
    Description: Autophagy degrades cytoplasmic components that are required for cell survival in response to starvation. Autophagy has also been associated with cell death, but it is unclear how this is distinguished from autophagy during cell survival. Drosophila salivary glands undergo programmed cell death that requires autophagy genes, and engulfment of salivary gland cells by phagocytes does not appear to occur. Here we show that Draper (Drpr), the Drosophila melanogaster orthologue of the Caenorhabditis elegans engulfment receptor CED-1, is required for autophagy during cell death. Null mutations in, and salivary gland-specific knockdown of, drpr inhibit salivary gland degradation. Knockdown of drpr prevents the induction of autophagy in dying salivary glands, and expression of the Atg1 autophagy regulator in drpr mutants suppresses the failure in degradation of salivary glands. Surprisingly, drpr is required in the same dying salivary gland cells in which it regulates autophagy induction, but drpr knockdown does not prevent starvation-induced autophagy in the fat body, which is associated with survival. In addition, components of the conserved engulfment pathway are required for clearance of dying salivary glands. To our knowledge, this is the first example of an engulfment factor that is required for self-clearance of cells. Further, Drpr is the first factor that distinguishes autophagy that is associated with cell death from autophagy associated with cell survival.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2892814/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2892814/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McPhee, Christina K -- Logan, Mary A -- Freeman, Marc R -- Baehrecke, Eric H -- DK32520/DK/NIDDK NIH HHS/ -- GM079431/GM/NIGMS NIH HHS/ -- NS053538/NS/NINDS NIH HHS/ -- R01 GM079431/GM/NIGMS NIH HHS/ -- R01 GM079431-04/GM/NIGMS NIH HHS/ -- R01 GM079431-05/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2010 Jun 24;465(7301):1093-6. doi: 10.1038/nature09127.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cancer Biology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20577216" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Autophagy/genetics/*physiology ; Caspases/metabolism ; Cell Death/physiology ; Cell Survival ; Drosophila Proteins/deficiency/genetics/*metabolism ; Drosophila melanogaster/*cytology/enzymology/genetics/*metabolism ; Fat Body/cytology ; Food Deprivation ; Genes, Insect/genetics ; Membrane Proteins/deficiency/genetics/*metabolism ; Oligonucleotide Array Sequence Analysis ; Protein-Serine-Threonine Kinases/genetics/metabolism ; Salivary Glands/cytology/metabolism
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  • 7
    Publication Date: 2008-01-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zheng, Alex Y -- Lawhorn, Janessa K -- Lumley, Thomas -- Freeman, Scott -- New York, N.Y. -- Science. 2008 Jan 25;319(5862):414-5. doi: 10.1126/science.1147852.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Box 355320, University of Washington, Seattle, WA 98195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18218880" target="_blank"〉PubMed〈/a〉
    Keywords: Biological Science Disciplines/*education ; College Admission Test ; Curriculum ; *Education, Graduate ; *Education, Medical, Undergraduate ; *Educational Measurement ; Humans ; Teaching ; Thinking
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2011-06-04
    Description: Science, technology, engineering, and mathematics instructors have been charged with improving the performance and retention of students from diverse backgrounds. To date, programs that close the achievement gap between students from disadvantaged versus nondisadvantaged educational backgrounds have required extensive extramural funding. We show that a highly structured course design, based on daily and weekly practice with problem-solving, data analysis, and other higher-order cognitive skills, improved the performance of all students in a college-level introductory biology class and reduced the achievement gap between disadvantaged and nondisadvantaged students--without increased expenditures. These results support the Carnegie Hall hypothesis: Intensive practice, via active-learning exercises, has a disproportionate benefit for capable but poorly prepared students.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Haak, David C -- HilleRisLambers, Janneke -- Pitre, Emile -- Freeman, Scott -- 52003841/Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2011 Jun 3;332(6034):1213-6. doi: 10.1126/science.1204820.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Box 351800, University of Washington, Seattle, WA 98195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21636776" target="_blank"〉PubMed〈/a〉
    Keywords: *Achievement ; Biology/*education ; Curriculum ; Educational Measurement ; Female ; Humans ; *Learning ; Male ; Minority Groups ; Models, Educational ; *Problem-Based Learning ; *Students ; Teaching/*methods ; Universities ; Washington
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  • 9
    Publication Date: 2012-01-17
    Description: The cytokine tumor necrosis factor (TNF) is the primary trigger of inflammation. Like many extracellular signaling proteins, TNF is synthesized as a transmembrane protein; the active signal is its ectodomain, which is shed from cells after cleavage by an ADAM family metalloprotease, ADAM17 (TNFalpha-converting enzyme, TACE). We report that iRhom2 (RHBDF2), a proteolytically inactive member of the rhomboid family, is required for TNF release in mice. iRhom2 binds TACE and promotes its exit from the endoplasmic reticulum. The failure of TACE to exit the endoplasmic reticulum in the absence of iRhom2 prevents the furin-mediated maturation and trafficking of TACE to the cell surface, the site of TNF cleavage. Given the role of TNF in autoimmune and inflammatory diseases, iRhom2 may represent an attractive therapeutic target.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3272371/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3272371/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Adrain, Colin -- Zettl, Markus -- Christova, Yonka -- Taylor, Neil -- Freeman, Matthew -- MC_U105178780/Medical Research Council/United Kingdom -- U.1051.01.009(78780)/Medical Research Council/United Kingdom -- U105178780/Medical Research Council/United Kingdom -- New York, N.Y. -- Science. 2012 Jan 13;335(6065):225-8. doi: 10.1126/science.1214400.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22246777" target="_blank"〉PubMed〈/a〉
    Keywords: ADAM Proteins/*metabolism ; Animals ; Carrier Proteins/genetics/*metabolism ; Cell Line ; Cell Membrane/metabolism ; Endoplasmic Reticulum/metabolism ; Enzyme Activation ; Furin/metabolism ; Humans ; Lipopolysaccharides/immunology ; Macrophages/metabolism ; Mice ; Mice, Knockout ; Protein Binding ; Protein Transport ; *Signal Transduction ; Tumor Necrosis Factor-alpha/*metabolism
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2012-09-18
    Description: It is held as a paradigm that ribosomally synthesized peptides and proteins contain only l-amino acids. We demonstrate a ribosomal origin of the marine sponge-derived polytheonamides, exceptionally potent, giant natural-product toxins. Isolation of the biosynthetic genes from the sponge metagenome revealed a bacterial gene architecture. Only six candidate enzymes were identified for 48 posttranslational modifications, including 18 epimerizations and 17 methylations of nonactivated carbon centers. Three enzymes were functionally validated, which showed that a radical S-adenosylmethionine enzyme is responsible for the unidirectional epimerization of multiple and different amino acids. Collectively, these complex alterations create toxins that function as unimolecular minimalistic ion channels with near-femtomolar activity. This study broadens the biosynthetic scope of ribosomal systems and creates new opportunities for peptide and protein bioengineering.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Freeman, Michael F -- Gurgui, Cristian -- Helf, Maximilian J -- Morinaka, Brandon I -- Uria, Agustinus R -- Oldham, Neil J -- Sahl, Hans-Georg -- Matsunaga, Shigeki -- Piel, Jorn -- New York, N.Y. -- Science. 2012 Oct 19;338(6105):387-90. doi: 10.1126/science.1226121. Epub 2012 Sep 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Kekule Institute of Organic Chemistry and Biochemistry, University of Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22983711" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Ion Channels/biosynthesis/*metabolism ; Marine Toxins/biosynthesis/*metabolism ; *Metagenome ; Methylation ; Molecular Sequence Data ; Protein Biosynthesis ; *Protein Processing, Post-Translational ; Proteins/*metabolism ; Ribosomes/metabolism ; S-Adenosylmethionine/metabolism ; Theonella/*microbiology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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