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  • Models, Molecular
  • 2020-2024
  • 2020-2023
  • 2010-2014
  • 2005-2009  (17)
  • 1950-1954
  • 2006  (17)
  • 1
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    Outer membrane active transport: structure of the BtuB:TonB complex (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-03
    Description: In Gram-negative bacteria, the import of essential micronutrients across the outer membrane requires a transporter, an electrochemical gradient of protons across the inner membrane, and an inner membrane protein complex (ExbB, ExbD, TonB) that couples the proton-motive force to the outer membrane transporter. The inner membrane protein TonB binds directly to a conserved region, called the Ton-box, of the transporter. We solved the structure of the cobalamin transporter BtuB in complex with the C-terminal domain of TonB. In contrast to its conformations in the absence of TonB, the Ton-box forms a beta strand that is recruited to the existing beta sheet of TonB, which is consistent with a mechanical pulling model of transport.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shultis, David D -- Purdy, Michael D -- Banchs, Christian N -- Wiener, Michael C -- DK59999/DK/NIDDK NIH HHS/ -- GM00Z055/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Jun 2;312(5778):1396-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22908, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16741124" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Outer Membrane Proteins/*chemistry/metabolism ; Biological Transport, Active ; Crystallography, X-Ray ; Escherichia coli ; Escherichia coli Proteins/*chemistry/metabolism ; Magnetic Resonance Spectroscopy ; Membrane Proteins/*chemistry/metabolism ; Membrane Transport Proteins/*chemistry/metabolism ; Models, Molecular ; Protein Binding ; Protein Conformation ; Protein Structure, Secondary
    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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  • 2
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    The dynamic energy landscape of dihydrofolate reductase catalysis (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-09-16
    Description: We used nuclear magnetic resonance relaxation dispersion to characterize higher energy conformational substates of Escherichia coli dihydrofolate reductase. Each intermediate in the catalytic cycle samples low-lying excited states whose conformations resemble the ground-state structures of preceding and following intermediates. Substrate and cofactor exchange occurs through these excited substates. The maximum hydride transfer and steady-state turnover rates are governed by the dynamics of transitions between ground and excited states of the intermediates. Thus, the modulation of the energy landscape by the bound ligands funnels the enzyme through its reaction cycle along a preferred kinetic path.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Boehr, David D -- McElheny, Dan -- Dyson, H Jane -- Wright, Peter E -- GM56879/GM/NIGMS NIH HHS/ -- GM75995/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Sep 15;313(5793):1638-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and Skaggs Institute for Chemical Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16973882" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Catalysis ; Escherichia coli/*enzymology ; Kinetics ; Ligands ; Models, Molecular ; NADP/metabolism ; Nuclear Magnetic Resonance, Biomolecular ; Protein Binding ; *Protein Conformation ; Tetrahydrofolate Dehydrogenase/*chemistry/*metabolism ; Tetrahydrofolates/metabolism ; Thermodynamics
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  • 3
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    Structure of tracheal cytotoxin in complex with a heterodimeric pattern-recognition receptor (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-03-25
    Description: Tracheal cytotoxin (TCT), a naturally occurring fragment of Gram-negative peptidoglycan, is a potent elicitor of innate immune responses in Drosophila. It induces the heterodimerization of its recognition receptors, the peptidoglycan recognition proteins (PGRPs) LCa and LCx, which activates the immune deficiency pathway. The crystal structure at 2.1 angstrom resolution of TCT in complex with the ectodomains of PGRP-LCa and PGRP-LCx shows that TCT is bound to and presented by the LCx ectodomain for recognition by the LCa ectodomain; the latter lacks a canonical peptidoglycan-docking groove conserved in other PGRPs. The interface, revealed in atomic detail, between TCT and the receptor complex highlights the importance of the anhydro-containing disaccharide in bridging the two ectodomains together and the critical role of diaminopimelic acid as the specificity determinant for PGRP interaction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, Chung-I -- Chelliah, Yogarany -- Borek, Dominika -- Mengin-Lecreulx, Dominique -- Deisenhofer, Johann -- New York, N.Y. -- Science. 2006 Mar 24;311(5768):1761-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of Texas Southwestern Medical Center at Dallas, 6001 Forest Park Road, Dallas, TX 75390-9050, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16556841" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Carrier Proteins/*chemistry/metabolism ; Crystallization ; Crystallography, X-Ray ; Cytotoxins/*chemistry/metabolism ; Drosophila melanogaster ; Hydrogen Bonding ; Hydrophobic and Hydrophilic Interactions ; Models, Molecular ; Molecular Sequence Data ; Peptidoglycan/*chemistry/metabolism ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary
    Print ISSN: 0036-8075
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  • 4
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    Crystal structure of a divalent metal ion transporter CorA at 2.9 angstrom resolution (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-07-22
    Description: CorA family members are ubiquitously distributed transporters of divalent metal cations and are considered to be the primary Mg2+ transporter of Bacteria and Archaea. We have determined a 2.9 angstrom resolution structure of CorA from Thermotoga maritima that reveals a pentameric cone-shaped protein. Two potential regulatory metal binding sites are found in the N-terminal domain that bind both Mg2+ and Co2+. The structure of CorA supports an efflux system involving dehydration and rehydration of divalent metal ions potentially mediated by a ring of conserved aspartate residues at the cytoplasmic entrance and a carbonyl funnel at the periplasmic side of the pore.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eshaghi, Said -- Niegowski, Damian -- Kohl, Andreas -- Martinez Molina, Daniel -- Lesley, Scott A -- Nordlund, Par -- New York, N.Y. -- Science. 2006 Jul 21;313(5785):354-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biophysics, Department of Medical Biochemistry and Biophysics, Karolinska Institute, SE-171 77 Stockholm, Sweden. Said.Eshaghi@ki.se〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16857941" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bacterial Proteins/*chemistry/metabolism ; Binding Sites ; Cation Transport Proteins/*chemistry/metabolism ; Chlorides/analysis/metabolism ; Cobalt/chemistry/*metabolism ; Crystallography, X-Ray ; Hydrophobic and Hydrophilic Interactions ; Magnesium/chemistry/*metabolism ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Sequence Alignment ; Thermotoga maritima/*chemistry ; Water/chemistry
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  • 5
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    An architectural framework that may lie at the core of the postsynaptic density (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-01-28
    Description: The postsynaptic density (PSD) is a complex assembly of proteins associated with the postsynaptic membrane that organizes neurotransmitter receptors, signaling pathways, and regulatory elements within a cytoskeletal matrix. Here we show that the sterile alpha motif domain of rat Shank3/ProSAP2, a master scaffolding protein located deep within the PSD, can form large sheets composed of helical fibers stacked side by side. Zn2+, which is found in high concentrations in the PSD, binds tightly to Shank3 and may regulate assembly. Sheets of the Shank protein could form a platform for the construction of the PSD complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baron, Marisa K -- Boeckers, Tobias M -- Vaida, Bianca -- Faham, Salem -- Gingery, Mari -- Sawaya, Michael R -- Salyer, Danielle -- Gundelfinger, Eckart D -- Bowie, James U -- R01 CA081000/CA/NCI NIH HHS/ -- R01 GM063919/GM/NIGMS NIH HHS/ -- R01 GM063919-07/GM/NIGMS NIH HHS/ -- R01 GM063919-08/GM/NIGMS NIH HHS/ -- R01 GM075922/GM/NIGMS NIH HHS/ -- R01 GM075922-04/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Jan 27;311(5760):531-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Biochemistry, Molecular Biology Institute, University of California, Los Angeles, 611 Charles E. Young Drive East, Los Angeles, CA 90095-1570, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16439662" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing/analysis/*chemistry/genetics/metabolism ; Animals ; Binding Sites ; Crystallization ; Crystallography, X-Ray ; Hippocampus/chemistry ; Microscopy, Electron ; Models, Molecular ; Mutation ; Nerve Tissue Proteins ; Neurons/chemistry ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Tertiary ; Protein Subunits/chemistry ; Rats ; Recombinant Fusion Proteins/analysis ; Solubility ; Synapses/*chemistry ; Zinc/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 6
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    Structure of human urokinase plasminogen activator in complex with its receptor (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-02-04
    Description: The urokinase plasminogen activator binds to its cellular receptor with high affinity and initiates signaling cascades that are implicated in pathological processes including tumor growth, metastasis, and inflammation. We report the crystal structure at 1.9 angstroms of the urokinase receptor complexed with the urokinase amino-terminal fragment and an antibody against the receptor. The three domains of urokinase receptor form a concave shape with a central cone-shaped cavity where the urokinase fragment inserts. The structure provides insight into the flexibility of the urokinase receptor that enables its interaction with a wide variety of ligands and a basis for the design of urokinase-urokinase receptor antagonists.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Huai, Qing -- Mazar, Andrew P -- Kuo, Alice -- Parry, Graham C -- Shaw, David E -- Callahan, Jennifer -- Li, Yongdong -- Yuan, Cai -- Bian, Chuanbing -- Chen, Liqing -- Furie, Bruce -- Furie, Barbara C -- Cines, Douglas B -- Huang, Mingdong -- R01 HL086584/HL/NHLBI NIH HHS/ -- R01 HL086584-01/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2006 Feb 3;311(5761):656-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Hemostasis and Thrombosis, Center for Vascular Biology Research, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16456079" target="_blank"〉PubMed〈/a〉
    Keywords: Antibodies/chemistry/metabolism ; Crystallography, X-Ray ; Humans ; Hydrogen Bonding ; Hydrophobic and Hydrophilic Interactions ; Ligands ; Models, Molecular ; Peptide Fragments/chemistry/metabolism ; Protein Binding ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Receptors, Cell Surface/*chemistry/immunology/metabolism ; Receptors, Urokinase Plasminogen Activator ; Urokinase-Type Plasminogen Activator/*chemistry/metabolism
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  • 7
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    A virulence locus of Pseudomonas aeruginosa encodes a protein secretion apparatus (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-10
    Description: Bacterial pathogens frequently use protein secretion to mediate interactions with their hosts. Here we found that a virulence locus (HSI-I) of Pseudomonas aeruginosa encodes a protein secretion apparatus. The apparatus assembled in discrete subcellular locations and exported Hcp1, a hexameric protein that forms rings with a 40 angstrom internal diameter. Regulatory patterns of HSI-I suggested that the apparatus functions during chronic infections. We detected Hcp1 in pulmonary secretions of cystic fibrosis (CF) patients and Hcp1-specific antibodies in their sera. Thus, HSI-I likely contributes to the pathogenesis of P. aeruginosa in CF patients. HSI-I-related loci are widely distributed among bacterial pathogens and may play a general role in mediating host interactions.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2800167/" 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/PMC2800167/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mougous, Joseph D -- Cuff, Marianne E -- Raunser, Stefan -- Shen, Aimee -- Zhou, Min -- Gifford, Casey A -- Goodman, Andrew L -- Joachimiak, Grazyna -- Ordonez, Claudia L -- Lory, Stephen -- Walz, Thomas -- Joachimiak, Andrzej -- Mekalanos, John J -- AI21451/AI/NIAID NIH HHS/ -- AI26289/AI/NIAID NIH HHS/ -- GM074942/GM/NIGMS NIH HHS/ -- GM62414/GM/NIGMS NIH HHS/ -- P50 GM062414/GM/NIGMS NIH HHS/ -- P50 GM062414-02/GM/NIGMS NIH HHS/ -- U54 GM074942/GM/NIGMS NIH HHS/ -- U54 GM074942-04S2/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Jun 9;312(5779):1526-30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16763151" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacterial Proteins/*genetics/physiology/secretion ; Crystallography, X-Ray ; Cystic Fibrosis/complications/microbiology ; Humans ; Models, Molecular ; Protein Conformation ; Pseudomonas Infections/complications/microbiology ; Pseudomonas aeruginosa/*genetics/pathogenicity ; Rats ; Recombinant Fusion Proteins ; Sequence Alignment ; Virulence/genetics
    Print ISSN: 0036-8075
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  • 8
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    Molecular recognition in the selective oxygenation of saturated C-H bonds by a dimanganese catalyst (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-07-01
    Description: Although enzymes often incorporate molecular recognition elements to orient substrates selectively, such strategies are rarely achieved by synthetic catalysts. We combined molecular recognition through hydrogen bonding with C-H activation to obtain high-turnover catalytic regioselective functionalization of sp3 C-H bonds remote from the -COOH recognition group. The catalyst contains a Mn(mu-O)2Mn reactive center and a ligand based on Kemp's triacid that directs a -COOH group to anchor the carboxylic acid group of the substrate and thus modify the usual selectivity for oxidation. Control experiments supported the role of hydrogen bonding in orienting the substrate to achieve high selectivity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Das, Siddhartha -- Incarvito, Christopher D -- Crabtree, Robert H -- Brudvig, Gary W -- GM32715/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Jun 30;312(5782):1941-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Yale University, 225 Prospect Street, Post Office Box 208107, New Haven, CT 06520-8107, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16809537" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Carbon/*chemistry ; Carboxylic Acids/*chemistry ; *Catalysis ; Chemistry, Physical ; Hydrogen/*chemistry ; Hydrogen Bonding ; Ibuprofen/*chemistry ; Ligands ; Magnetic Resonance Spectroscopy ; Manganese/*chemistry ; Models, Chemical ; Models, Molecular ; Molecular Structure ; Organometallic Compounds/*chemistry ; Oxidation-Reduction ; Physicochemical Phenomena
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  • 9
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    Electric fields at the active site of an enzyme: direct comparison of experiment with theory (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-07-15
    Description: The electric fields produced in folded proteins influence nearly every aspect of protein function. We present a vibrational spectroscopy technique that measures changes in electric field at a specific site of a protein as shifts in frequency (Stark shifts) of a calibrated nitrile vibration. A nitrile-containing inhibitor is used to deliver a unique probe vibration to the active site of human aldose reductase, and the response of the nitrile stretch frequency is measured for a series of mutations in the enzyme active site. These shifts yield quantitative information on electric fields that can be directly compared with electrostatics calculations. We show that extensive molecular dynamics simulations and ensemble averaging are required to reproduce the observed changes in field.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Suydam, Ian T -- Snow, Christopher D -- Pande, Vijay S -- Boxer, Steven G -- New York, N.Y. -- Science. 2006 Jul 14;313(5784):200-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16840693" target="_blank"〉PubMed〈/a〉
    Keywords: Aldehyde Reductase/antagonists & inhibitors/*chemistry/genetics/metabolism ; Binding Sites ; Circular Dichroism ; Computer Simulation ; *Electricity ; Enzyme Inhibitors/metabolism/pharmacology ; Humans ; Models, Molecular ; Mutation ; Nitriles/metabolism/pharmacology ; Protein Conformation ; Protein Folding ; Protein Structure, Tertiary ; Spectrophotometry, Infrared ; Spectrum Analysis ; Static Electricity
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  • 10
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    Structural basis for double-stranded RNA processing by Dicer (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-01-18
    Description: The specialized ribonuclease Dicer initiates RNA interference by cleaving double-stranded RNA (dsRNA) substrates into small fragments about 25 nucleotides in length. In the crystal structure of an intact Dicer enzyme, the PAZ domain, a module that binds the end of dsRNA, is separated from the two catalytic ribonuclease III (RNase III) domains by a flat, positively charged surface. The 65 angstrom distance between the PAZ and RNase III domains matches the length spanned by 25 base pairs of RNA. Thus, Dicer itself is a molecular ruler that recognizes dsRNA and cleaves a specified distance from the helical end.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Macrae, Ian J -- Zhou, Kaihong -- Li, Fei -- Repic, Adrian -- Brooks, Angela N -- Cande, W Zacheus -- Adams, Paul D -- Doudna, Jennifer A -- New York, N.Y. -- Science. 2006 Jan 13;311(5758):195-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16410517" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Conserved Sequence ; Crystallography, X-Ray ; Giardia lamblia/enzymology ; Humans ; Lanthanoid Series Elements/metabolism ; Models, Molecular ; Molecular Sequence Data ; Protein Structure, Tertiary ; RNA Interference ; RNA, Double-Stranded/*metabolism ; RNA, Protozoan/metabolism ; Recombinant Fusion Proteins/genetics/metabolism ; Ribonuclease III/*chemistry/metabolism ; Schizosaccharomyces/genetics ; Structure-Activity Relationship
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