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  • 1
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    Allostery in the ferredoxin protein motif does not involve a conformational switch [Biophysics and Computational Biology] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-02-09
    Description: Regulation of protein function via cracking, or local unfolding and refolding of substructures, is becoming a widely recognized mechanism of functional control. Oftentimes, cracking events are localized to secondary and tertiary structure interactions between domains that control the optimal position for catalysis and/or the formation of protein complexes. Small changes in free energy associated with ligand binding, phosphorylation, etc., can tip the balance and provide a regulatory functional switch. However, understanding the factors controlling function in single-domain proteins is still a significant challenge to structural biologists. We investigated the functional landscape of a single-domain plant-type ferredoxin protein and the effect of a distal loop on the electron-transfer center. We find the global stability and structure are minimally perturbed with mutation, whereas the functional properties are altered. Specifically, truncating the L1,2 loop does not lead to large-scale changes in the structure, determined via X-ray crystallography. Further, the overall thermal stability of the protein is only marginally perturbed by the mutation. However, even though the mutation is distal to the iron–sulfur cluster (∼20 Å), it leads to a significant change in the redox potential of the iron–sulfur cluster (57 mV). Structure-based all-atom simulations indicate correlated dynamical changes between the surface-exposed loop and the iron–sulfur cluster-binding region. Our results suggest intrinsic communication channels within the ferredoxin fold, composed of many short-range interactions, lead to the propagation of long-range signals. Accordingly, protein interface interactions that involve L1,2 could potentially signal functional changes in distal regions, similar to what is observed in other allosteric systems.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 2
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    The light-induced transcriptome of the zebrafish pineal gland reveals complex regulation of the circadian clockwork by light (2014)
    Oxford University Press
    Details
    Publication Date: 2014-04-03
    Description: Light constitutes a primary signal whereby endogenous circadian clocks are synchronized (‘entrained’) with the day/night cycle. The molecular mechanisms underlying this vital process are known to require gene activation, yet are incompletely understood. Here, the light-induced transcriptome in the zebrafish central clock organ, the pineal gland, was characterized by messenger RNA (mRNA) sequencing (mRNA-seq) and microarray analyses, resulting in the identification of multiple light-induced mRNAs. Interestingly, a considerable portion of the molecular clock (14 genes) is light-induced in the pineal gland. Four of these genes, encoding the transcription factors dec1 , reverbb1 , e4bp4-5 and e4bp4-6 , differentially affected clock- and light-regulated promoter activation, suggesting that light-input is conveyed to the core clock machinery via diverse mechanisms. Moreover, we show that dec1 , as well as the core clock gene per2 , is essential for light-entrainment of rhythmic locomotor activity in zebrafish larvae. Additionally, we used microRNA (miRNA) sequencing (miR-seq) and identified pineal-enhanced and light-induced miRNAs. One such miRNA, miR-183, is shown to downregulate e4bp4-6 mRNA through a 3'UTR target site, and importantly, to regulate the rhythmic mRNA levels of aanat2 , the key enzyme in melatonin synthesis. Together, this genome-wide approach and functional characterization of light-induced factors indicate a multi-level regulation of the circadian clockwork by light.
    Print ISSN: 0305-1048
    Electronic ISSN: 1362-4962
    Topics: Biology
    Published by Oxford University Press
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  • 3
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    How chaperones protect virgin proteins (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-09-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eisenberg, D -- New York, N.Y. -- Science. 1999 Aug 13;285(5430):1021-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉DOE Laboratory of Structural Biology and Molecular Medicine, University of California, Los Angeles, CA 90095, USA. david@mbi.ucla.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10475844" target="_blank"〉PubMed〈/a〉
    Keywords: Adhesins, Bacterial/chemistry/metabolism ; *Adhesins, Escherichia coli ; Bacterial Outer Membrane Proteins/chemistry/metabolism ; Bacterial Proteins/chemistry/*metabolism ; Crystallography, X-Ray ; Escherichia coli/metabolism/ultrastructure ; *Escherichia coli Proteins ; Fimbriae Proteins ; Fimbriae, Bacterial/*metabolism/ultrastructure ; Membrane Proteins/chemistry/*metabolism ; Models, Molecular ; Molecular Chaperones/*chemistry/*metabolism ; *Periplasmic Proteins ; Protein Folding ; Protein Structure, Secondary ; Thermodynamics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Detecting protein function and protein-protein interactions from genome sequences (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-31
    Description: A computational method is proposed for inferring protein interactions from genome sequences on the basis of the observation that some pairs of interacting proteins have homologs in another organism fused into a single protein chain. Searching sequences from many genomes revealed 6809 such putative protein-protein interactions in Escherichia coli and 45,502 in yeast. Many members of these pairs were confirmed as functionally related; computational filtering further enriches for interactions. Some proteins have links to several other proteins; these coupled links appear to represent functional interactions such as complexes or pathways. Experimentally confirmed interacting pairs are documented in a Database of Interacting Proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marcotte, E M -- Pellegrini, M -- Ng, H L -- Rice, D W -- Yeates, T O -- Eisenberg, D -- P01 GM 31299/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 30;285(5428):751-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉UCLA-Department of Energy Laboratory of Structural Biology and Molecular Medicine, University of California at Los Angeles, Los Angeles, CA 90095-1570, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10427000" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bacterial Proteins/chemistry/genetics/metabolism/physiology ; Binding Sites ; *Computational Biology ; Databases, Factual ; Escherichia coli/genetics ; Evolution, Molecular ; Fungal Proteins/chemistry/genetics/metabolism ; *Genome ; Genome, Bacterial ; Genome, Fungal ; Humans ; Models, Biological ; Proteins/chemistry/genetics/metabolism/*physiology ; *Sequence Homology, Amino Acid ; *Sequence Homology, Nucleic Acid ; Thermodynamics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Crystal structure of human BPI and two bound phospholipids at 2.4 angstrom resolution (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-06-20
    Description: Bactericidal/permeability-increasing protein (BPI), a potent antimicrobial protein of 456 residues, binds to and neutralizes lipopolysaccharides from the outer membrane of Gram-negative bacteria. At a resolution of 2.4 angstroms, the crystal structure of human BPI shows a boomerang-shaped molecule formed by two similar domains. Two apolar pockets on the concave surface of the boomerang each bind a molecule of phosphatidylcholine, primarily by interacting with their acyl chains; this suggests that the pockets may also bind the acyl chains of lipopolysaccharide. As a model for the related plasma lipid transfer proteins, BPI illuminates a mechanism of lipid transfer for this protein family.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Beamer, L J -- Carroll, S F -- Eisenberg, D -- GM31299/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1997 Jun 20;276(5320):1861-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉UCLA-DOE Laboratory of Structural Biology and Molecular Medicine, Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9188532" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Antimicrobial Cationic Peptides ; Binding Sites ; Blood Bactericidal Activity ; Blood Proteins/*chemistry/metabolism ; Crystallization ; Crystallography, X-Ray ; Humans ; Lipopolysaccharides/metabolism ; *Membrane Proteins ; Models, Molecular ; Molecular Sequence Data ; Phosphatidylcholines/chemistry/*metabolism ; *Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Crystal structure of defensin HNP-3, an amphiphilic dimer: mechanisms of membrane permeabilization (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-03-22
    Description: Defensins (molecular weight 3500 to 4000) act in the mammalian immune response by permeabilizing the plasma membranes of a broad spectrum of target organisms, including bacteria, fungi, and enveloped viruses. The high-resolution crystal structure of defensin HNP-3 (1.9 angstrom resolution, R factor 0.19) reveals a dimeric beta sheet that has an architecture very different from other lytic peptides. The dimeric assembly suggests mechanisms by which defensins might bind to and permeabilize the lipid bilayer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hill, C P -- Yee, J -- Selsted, M E -- Eisenberg, D -- New York, N.Y. -- Science. 1991 Mar 22;251(5000):1481-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Eisenberg, Molecular Biology Institute, Los Angeles, CA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2006422" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Blood Proteins/chemistry/*ultrastructure ; Cell Membrane Permeability ; Crystallography ; Defensins ; Guinea Pigs ; Humans ; Macromolecular Substances ; Membrane Proteins/chemistry/ultrastructure ; Models, Molecular ; Molecular Sequence Data ; Molecular Structure ; Protein Conformation ; Rabbits ; Rats ; Structure-Activity Relationship ; X-Ray Diffraction ; *alpha-Defensins
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Hydrophobic organization of membrane proteins (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-08-04
    Description: Membrane-exposed residues are more hydrophobic than buried interior residues in the transmembrane regions of the photosynthetic reaction center from Rhodobacter sphaeroides. This hydrophobic organization is opposite to that of water-soluble proteins. The relative polarities of interior and surface residues of membrane and water soluble proteins are not simply reversed, however. The hydrophobicities of interior residues of both membrane and water-soluble proteins are comparable, whereas the bilayer-exposed residues of membrane proteins are more hydrophobic than the interior residues, and the aqueous-exposed residues of water-soluble proteins are more hydrophilic than the interior residues. A method of sequence analysis is described, based on the periodicity of residue replacement in homologous sequences, that extends conclusions derived from the known atomic structure of the reaction center to the more extensive database of putative transmembrane helical sequences.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rees, D C -- DeAntonio, L -- Eisenberg, D -- GM31299/GM/NIGMS NIH HHS/ -- GM39558/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1989 Aug 4;245(4917):510-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Biochemistry, University of California, Los Angeles 90024.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2667138" target="_blank"〉PubMed〈/a〉
    Keywords: *Bacterial Proteins ; Cell Membrane/analysis ; Chemistry, Physical ; Fourier Analysis ; *Membrane Proteins ; Photosynthetic Reaction Center Complex Proteins ; Physicochemical Phenomena ; Protein Conformation ; Rhodobacter sphaeroides/*ultrastructure ; Solubility ; Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    Crystal structure of alpha 1: implications for protein design (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-03
    Description: X-ray diffraction shows the structure of a synthetic protein model, formed from noncovalent self-association of a 12-residue peptide and of sulfate ions at low pH. This peptide is a fragment of a 16-residue polypeptide that was designed to form an amphiphilic alpha helix with a ridge of Leu residues along one helical face. By interdigitation of the leucines of four such helices, the design called for self-association into a four-alpha-helical bundle. The crystal structure (2.7 angstrom resolution; R factor = 0.215) reveals a structure more complex than the design, with both a tetramer and a hexamer. The alpha-helical tetramer with leucine interior has more oblique crossing angles than most four-alpha-helical bundles; the hexamer has a globular hydrophobic core of 12 leucine residues and three associated sulfate ions. Computational analysis suggests that the hexameric association is tighter than the tetrameric one. The consistency of the structure with the design is discussed, as well as the divergence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hill, C P -- Anderson, D H -- Wesson, L -- DeGrado, W F -- Eisenberg, D -- New York, N.Y. -- Science. 1990 Aug 3;249(4968):543-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Biology Institute, University of California, Los Angeles 90024-1569.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2382133" target="_blank"〉PubMed〈/a〉
    Keywords: Macromolecular Substances ; *Models, Molecular ; Molecular Sequence Data ; *Peptides ; *Protein Conformation ; *Proteins
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    A method to identify protein sequences that fold into a known three-dimensional structure (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-07-12
    Description: The inverse protein folding problem, the problem of finding which amino acid sequences fold into a known three-dimensional (3D) structure, can be effectively attacked by finding sequences that are most compatible with the environments of the residues in the 3D structure. The environments are described by: (i) the area of the residue buried in the protein and inaccessible to solvent; (ii) the fraction of side-chain area that is covered by polar atoms (O and N); and (iii) the local secondary structure. Examples of this 3D profile method are presented for four families of proteins: the globins, cyclic AMP (adenosine 3',5'-monophosphate) receptor-like proteins, the periplasmic binding proteins, and the actins. This method is able to detect the structural similarity of the actins and 70- kilodalton heat shock proteins, even though these protein families share no detectable sequence similarity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bowie, J U -- Luthy, R -- Eisenberg, D -- New York, N.Y. -- Science. 1991 Jul 12;253(5016):164-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Biology Institute, University of California, Los Angeles 90024-1570.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1853201" target="_blank"〉PubMed〈/a〉
    Keywords: Actins/chemistry/ultrastructure ; Algorithms ; Amino Acid Sequence ; Animals ; Carrier Proteins/chemistry ; *Escherichia coli Proteins ; Molecular Structure ; Myoglobin/chemistry/ultrastructure ; *Periplasmic Binding Proteins ; *Protein Conformation ; Proteins/*chemistry ; Receptors, Cyclic AMP/chemistry/ultrastructure ; Structure-Activity Relationship
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Debating the Worth of NCCAM Research (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-11-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Folkman, Susan -- Berman, Brian -- Bondurant, Stuart -- Eisenberg, David -- Haramati, Aviad -- Kreitzer, Mary Jo -- Kronenberg, Fredi -- New York, N.Y. -- Science. 2006 Nov 17;314(5802):1083-4; author reply 1083-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17110556" target="_blank"〉PubMed〈/a〉
    Keywords: Biomedical Research/standards ; *Complementary Therapies/organization & administration/standards ; Humans ; *National Institutes of Health (U.S.)/organization & administration ; Politics ; United States
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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