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Articles 1 - 30 of 39
Full-Text Articles in Molecular Biology
Nf-Kappab Signaling Pathways In Mammalian And Insect Innate Immunity, Neal S. Silverman, Tom Maniatis
Nf-Kappab Signaling Pathways In Mammalian And Insect Innate Immunity, Neal S. Silverman, Tom Maniatis
Neal Silverman
In this review, we discuss recent advances in understanding the signaling pathways in mammalian and Drosophila innate immunity, with emphasis on the mechanisms by which NF-kappaB/Rel family proteins are activated.
Nucleotide And Phospholipid-Dependent Control Of Ppxd And C-Domain Association For Seca Atpase, Don Oliver
Nucleotide And Phospholipid-Dependent Control Of Ppxd And C-Domain Association For Seca Atpase, Don Oliver
Don Oliver
The SecA ATPase motor is a central component of the eubacterial protein translocation machinery. It is comprised of N- and C-domain substructures, where the N-domain is comprised of two nucleotide-binding domains that flank a preprotein-binding domain (PPXD), while the C-domain binds phospholipids as well as SecB chaperone. Our recent crystal structure of Bacillus subtilis SecA protomer [Hunt, J. F., Weinkauf, S., Henry, L., Fak, J. J., McNicholas, P., Oliver, D. B., and Deisenhofer, J. (2002) Science 297, 2018-2026] along with experimental support for the correct dimer structure [Ding, H., Hunt, J. F., Mukerji, I., and Oliver, D. (2003) Biochemistry 42, …
Role Of A Conserved Glutamate Residue In The Escherichia Coli Seca Atpase Mechanism, Don Oliver
Role Of A Conserved Glutamate Residue In The Escherichia Coli Seca Atpase Mechanism, Don Oliver
Don Oliver
Escherichia coli SecA uses ATP to drive the transport of proteins across cell membranes. Glutamate 210 in the "DEVD" Walker B motif of the SecA ATP-binding site has been proposed as the catalytic base for ATP hydrolysis (Hunt, J. F., Weinkauf, S., Henry, L., Fak, J. J., McNicholas, P., Oliver, D. B., and Deisenhofer, J. (2002) Science 297, 2018-2026). Consistent with this hypothesis, we find that mutation of glutamate 210 to aspartate results in a 90-fold reduction of the ATP hydrolysis rate compared with wild type SecA, 0.3 s(-1) versus 27 s(-1), respectively. SecA-E210D also releases ADP at a slower …
Dimeric Seca Is Essential For Protein Translocation, Don Oliver
Dimeric Seca Is Essential For Protein Translocation, Don Oliver
Don Oliver
SecA facilitates bacterial protein translocation by its association with presecretory or membrane proteins and the SecYEG translocon channel. Once assembled, SecA ATPase undergoes cycles of membrane insertion and retraction at SecYEG that drive protein translocation in a stepwise fashion. SecA exists in equilibrium between a monomer and dimer, and association with its translocation ligands shifts this equilibrium dramatically. Here, we examined the proposal that protein translocation can occur by means of a SecA monomer. We produced a mutant SecA protein lacking residues 2-11, which was found to exist mostly as a monomer, and it was unable to complement a conditional-lethal …
Muc4/Muc4 Functions And Regulation In Cancer., Goldi Kozloski
Muc4/Muc4 Functions And Regulation In Cancer., Goldi Kozloski
Goldi A Kozloski
Reexamination Of The Role Of The Amino Terminus Of Seca In Promoting Its Dimerization And Functional State, Don Oliver
Reexamination Of The Role Of The Amino Terminus Of Seca In Promoting Its Dimerization And Functional State, Don Oliver
Don Oliver
No abstract provided.
Seca Dimer Cross-Linked At Its Subunit Interface Is Functional For Protein Translocation, Don Oliver
Seca Dimer Cross-Linked At Its Subunit Interface Is Functional For Protein Translocation, Don Oliver
Don Oliver
SecA facilitates protein transport across the eubacterial plasma membrane by its association with cargo proteins and the SecYEG translocon, followed by ATP-driven conformational changes that promote protein translocation in a stepwise manner. Whether SecA functions as a monomer or a dimer during this process has been the subject of considerable controversy. Here we utilize cysteine-directed mutagenesis along with the crystal structure of the SecA dimer to create a cross-linked dimer at its subunit interface, which was normally active for in vitro protein translocation.
In Vivo Membrane Topology Of Escherichia Coli Seca Atpase Reveals Extensive Periplasmic Exposure Of Multiple Functionally Important Domains Clustering On One Face Of Seca, Don Oliver
Don Oliver
No abstract provided.
Genetic Effect Of The Dwarfing Genes On Some Culm Characteristics Associatcd With Lodging Resistance In Bread Wheat, Md. Mahbub Hasan
Genetic Effect Of The Dwarfing Genes On Some Culm Characteristics Associatcd With Lodging Resistance In Bread Wheat, Md. Mahbub Hasan
Md. Mahbub Hasan
Due to the challenge of screening traits related to lodging resistance under natural field conditions, selection for lodging resistant varieties in wheat breeding programs is difficult. The identification of easily measurable culm anatomical traits related to lodging resistance would simplify the selection process. The present study was conducted to determine the effect of dwarfing genes on culm anatomical traits related to lodging resistance in our of basal internode 1. Field and laboratory study was conducted in Shahjalal University of Science and Technology, Sylhet, Bangladesh with eight wheat genotypes having Rhr1, Rht2 dwarfing genes in them and a local land race …
Toc Receptor Dimerization Participates In The Initiation Of Membrane Translocation During Protein Import Into Chloroplasts, Jeonghwa Lee, Fei Wang Wang, Danny Schnell
Toc Receptor Dimerization Participates In The Initiation Of Membrane Translocation During Protein Import Into Chloroplasts, Jeonghwa Lee, Fei Wang Wang, Danny Schnell
Danny Schnell
The post-translational import of nucleus-encoded preproteins into chloroplasts occurs through multimeric translocons in the outer (Toc) and inner (Tic) membranes. The high fidelity of the protein import process is maintained by specific recognition of the transit peptide of preproteins by the coordinate activities of two homologous GTPase Toc receptors, Toc34 and Toc159. Structural and biochemical studies suggest that dimerization of the Toc receptors functions as a component of the mechanism to control access of preproteins to the membrane translocation channel of the translocon. We show that specific mutations that disrupted receptor dimerization in vitro reduced the rate of protein import …
A Feedback Circuit Involving Let-7-Family Mirnas And Daf-12 Integrates Environmental Signals And Developmental Timing In Caenorhabditis Elegans, Christopher M. Hammell, Xantha Karp, Victor R. Ambros
A Feedback Circuit Involving Let-7-Family Mirnas And Daf-12 Integrates Environmental Signals And Developmental Timing In Caenorhabditis Elegans, Christopher M. Hammell, Xantha Karp, Victor R. Ambros
Victor R. Ambros
Animal development is remarkably robust; cell fates are specified with spatial and temporal precision despite physiological and environmental contingencies. Favorable conditions cause Caenorhabditis elegans to develop rapidly through four larval stages (L1-L4) to the reproductive adult. In unfavorable conditions, L2 larvae can enter the developmentally quiescent, stress-resistant dauer larva stage, enabling them to survive for prolonged periods before completing development. A specific progression of cell division and differentiation events occurs with fidelity during the larval stages, regardless of whether an animal undergoes continuous or dauer-interrupted development. The temporal patterning of developmental events is controlled by the heterochronic genes, whose products …
Hu Binding To Bent Dna: A Fluorescence Resonance Energy Transfer And Antisotropy Study, Ishita Mukerji
Hu Binding To Bent Dna: A Fluorescence Resonance Energy Transfer And Antisotropy Study, Ishita Mukerji
Ishita Mukerji
HU, an architectural DNA-binding protein, either stabilizes DNA in a bent conformation or induces a bend upon binding to give other proteins access to the DNA. In this study, HU binding affinity for a bent DNA sequence relative to a linear sequence was investigated using fluorescence anisotropy measurements. A static bend was achieved by the introduction of two phased A4T4 tracts in a 20 bp duplex. Binding affinity for 20 bp duplexes containing two phased A-tracts in either a 5'-3' or 3'-5' orientation was found to be almost 10-fold higher than HU binding to a random sequence 20 bp duplex …
Uv Resonance Raman And Circular Dichroism Studies Of A Dna Duplex Containing An A3t3 Tract: Evidence For A Premelting Transition And Three-Centered H-Bonds, Ishita Mukerji
Ishita Mukerji
The presence of A(n) and A(n)T(n) tracts in double-helical sequences perturbs the structural properties of DNA molecules, resulting in the formation of an alternate conformation to standard B-DNA known as B'-DNA. Evidence for a transition occurring prior to duplex melting in molecules containing A(n) tracts was previously detected by circular dichroism (CD) and calorimetric studies. This premelting transition was attributed to a conformational change from B'- to B-DNA. Structural features of A(n) and A(n)T(n) tracts revealed by X-ray crystallography include a large degree of propeller twisting of adenine bases, narrowed minor grooves, and the formation of three-centered H-bonds between dA …
Ppar Agonists Down-Regulate The Expression Of Atp10c Mrna During Adipogenesis, A Peretich, Maria Cekanova Ms, Rndr, Phd, S Hurst, Sj Baek, Madhu Dahr
Ppar Agonists Down-Regulate The Expression Of Atp10c Mrna During Adipogenesis, A Peretich, Maria Cekanova Ms, Rndr, Phd, S Hurst, Sj Baek, Madhu Dahr
Maria Cekanova MS, RNDr, PhD
No abstract provided.
The Role Of B93 Cys In The Inhibition Of Hb S Fiber Formation, Ishita Mukerji
The Role Of B93 Cys In The Inhibition Of Hb S Fiber Formation, Ishita Mukerji
Ishita Mukerji
No abstract provided.
Spectroscopic And Molecular Dynamics Evidence For A Sequential Mechanisms For The A-To-B Transition In Dna, Ishita Mukerji
Spectroscopic And Molecular Dynamics Evidence For A Sequential Mechanisms For The A-To-B Transition In Dna, Ishita Mukerji
Ishita Mukerji
The A-to-B form transition has been examined in three DNA duplexes, d(CGCGAATTCGCG)2, d(CGCGAATTGCGC), and d(CGCAAATTTCGC), using circular dichroism spectroscopy, ultraviolet resonance Raman (UVRR) spectroscopy, and molecular dynamics (MD) simulation. Circular dichroism spectra confirm that these molecules adopt the A form under conditions of reduced water activity. UVRR results, obtained under similar conditions, suggest that the transition involves a series of intermediate forms between A and B. Cooperative and distinct transitions were observed for the bases and the sugars. Independent MD simulations on d(CGCGAATTCGCG)2 show a spontaneous change from the A to B form in aqueous solution and describe a kinetic …
Integration Host Factor (Ihf) Dictates The Structure Of Polyamine-Dna Condensates: Implications For The Role Of Ihf In The Compaction Of Bacterial Chromatin, Ishita Mukerji
Ishita Mukerji
No abstract provided.
Effects Of Hu Binding On The Equilibrium Cyclization Of Mismatched, Curved And Normal Dna, Ishita Mukerji
Effects Of Hu Binding On The Equilibrium Cyclization Of Mismatched, Curved And Normal Dna, Ishita Mukerji
Ishita Mukerji
No abstract provided.
The Effects Of Nucleotides On Muts-Dna Binding Kinetics Clarify The Role Of Muts Atpase Activity In Mismatch Repair, Manju Hingorani
The Effects Of Nucleotides On Muts-Dna Binding Kinetics Clarify The Role Of Muts Atpase Activity In Mismatch Repair, Manju Hingorani
Manju Hingorani
MutS protein initiates mismatch repair with recognition of a non-Watson-Crick base-pair or base insertion/deletion site in DNA, and its interactions with DNA are modulated by ATPase activity. Here, we present a kinetic analysis of these interactions, including the effects of ATP binding and hydrolysis, reported directly from the mismatch site by 2-aminopurine fluorescence. When free of nucleotides, the Thermus aquaticus MutS dimer binds a mismatch rapidly (k(ON)=3 x 10(6) M(-1) s(-1)) and forms a stable complex with a half-life of 10 s (k(OFF)=0.07 s(-1)). When one or both nucleotide-binding sites on the MutS*mismatch complex are occupied by ATP, the complex …
Contribution Of Msh2 And Msh6 Subunits To The Asymmetric Atpase And Dna Mismatch Binding Activities Of Saccharomyces Cerevisiae Msh2–Msh6 Mismatch Repair Protein, Manju Hingorani
Manju Hingorani
Previous analyses of both Thermus aquaticus MutS homodimer and Saccharomyces cerevisiae Msh2–Msh6 heterodimer have revealed that the subunits in these protein complexes bind and hydrolyze ATP asymmetrically, emulating their asymmetric DNA binding properties. In the MutS homodimer, one subunit (S1) binds ATP with high affinity and hydrolyzes it rapidly, while the other subunit (S2) binds ATP with lower affinity and hydrolyzes it at an apparently slower rate. Interaction of MutS with mismatched DNA results in suppression of ATP hydrolysis at S1—but which of these subunits, S1 or S2, makes specific contact with the mismatch (e.g., base stacking by a conserved …
Conserved Residues In The Delta Subunit Help The E. Coli Clamp Loader, Gamma Complex, Target Primer-Template Dna For Clamp Assembly, Manju Hingorani
Conserved Residues In The Delta Subunit Help The E. Coli Clamp Loader, Gamma Complex, Target Primer-Template Dna For Clamp Assembly, Manju Hingorani
Manju Hingorani
The Escherichia coli clamp loader, gamma complex (gamma(3)deltadelta'lambdapsi), catalyzes ATP-driven assembly of beta clamps onto primer-template DNA (p/tDNA), enabling processive replication. The mechanism by which gamma complex targets p/tDNA for clamp assembly is not resolved. According to previous studies, charged/polar amino acids inside the clamp loader chamber interact with the double-stranded (ds) portion of p/tDNA. We find that dsDNA, not ssDNA, can trigger a burst of ATP hydrolysis by gamma complex and clamp assembly, but only at far higher concentrations than p/tDNA. Thus, contact between gamma complex and dsDNA is necessary and sufficient, but not optimal, for the reaction, and …
Mechanism Of Cadmium-Mediated Inhibition Of Msh2-Msh6 Function In Dna Mismatch Repair, Manju Hingorani
Mechanism Of Cadmium-Mediated Inhibition Of Msh2-Msh6 Function In Dna Mismatch Repair, Manju Hingorani
Manju Hingorani
The observation that Cadmium (Cd(2+)) inhibits Msh2-Msh6, which is responsible for identifying base pair mismatches and other discrepancies in DNA, has led to the proposal that selective targeting of this protein and consequent suppression of DNA repair or apoptosis promote the carcinogenic effects of the heavy metal toxin. It has been suggested that Cd(2+) binding to specific sites on Msh2-Msh6 blocks its DNA binding and ATPase activities. To investigate the mechanism of inhibition, we measured Cd(2+) binding to Msh2-Msh6, directly and by monitoring changes in protein structure and enzymatic activity. Global fitting of the data to a multiligand binding model …
Model-Based Global Analysis Of Heterogeneous Experimental Data Using Gfit, Manju Hingorani
Model-Based Global Analysis Of Heterogeneous Experimental Data Using Gfit, Manju Hingorani
Manju Hingorani
Regression analysis is indispensible for quantitative understanding of biological systems and for developing accurate computational models. By applying regression analysis, one can validate models and quantify components of the system, including ones that cannot be observed directly. Global (simultaneous) analysis of all experimental data available for the system produces the most informative results. To quantify components of a complex system, the dataset needs to contain experiments of different types performed under a broad range of conditions. However, heterogeneity of such datasets complicates implementation of the global analysis. Computational models continuously evolve to include new knowledge and to account for novel …
Conformational Changes In Receptor Tyrosine Kinase Signaling: An Erbb Garden Of Delights., Goldi Kozloski
Conformational Changes In Receptor Tyrosine Kinase Signaling: An Erbb Garden Of Delights., Goldi Kozloski
Goldi A Kozloski
Sinorhizobium Meliloti Cpdr1 Is Critical For Co-Ordinating Cell Cycle Progression And The Symbiotic Chronic Infection, H. Kobayashi, N. J. Kobayashi, Peter Chien, L. A. Simmons, G. C. Walker
Sinorhizobium Meliloti Cpdr1 Is Critical For Co-Ordinating Cell Cycle Progression And The Symbiotic Chronic Infection, H. Kobayashi, N. J. Kobayashi, Peter Chien, L. A. Simmons, G. C. Walker
Peter Chien
ATP-driven proteolysis plays a major role in regulating the bacterial cell cycle, development and stress responses. In the nitro -fixing symbiosis with host plants, Sinorhizobium meliloti undergoes a profound cellular differentiation, including endoreduplication of the ome. The regulatory mechanisms governing the alterations of the S. meliloti cell cycle in planta are largely unknown. Here, we report the characterization of two cpdR homologues, cpdR1 and cpdR2, of S. meliloti that encode single-domain response regulators. In Caulobacter crescentus, CpdR controls the polar localization of the ClpXP protease, thereby mediating the regulated proteolysis of key protein(s), such as CtrA, involved in cell cycle …
Genomic Analysis Of The Basal Lineage Fungus Rhizopus Oryzae Reveals A Whole-Genome Duplication, Li-Jun Ma, Ashraf S. Ibrahim, Christopher Skory, Manfred G. Grabherr, Gertraud Burger, Margi Butler, Marek Elias, Alexander Idnurm, B. Franz Lang, Teruo Sone, Ayumi Abe, Sarah E. Calvo, Luis M. Corrochano, Reinhard Engels, Jianmin Fu, Wilhelm Hansberg, Jung-Mi Kim, Chinnappa D. Kodira, Michael J. Koehrsen, Bo Liu, Diego Miranda-Saavedra, Sinead O'Leary, Lucila Ortiz-Castellanos, Russell Poulter, Julio Rodriguez-Romero, José Ruiz-Herrera, Yao-Qing Shen, Qiandong Zeng, James Galagan, Bruce W. Birren, Christina A. Cuomo, Brian L. Wickes
Genomic Analysis Of The Basal Lineage Fungus Rhizopus Oryzae Reveals A Whole-Genome Duplication, Li-Jun Ma, Ashraf S. Ibrahim, Christopher Skory, Manfred G. Grabherr, Gertraud Burger, Margi Butler, Marek Elias, Alexander Idnurm, B. Franz Lang, Teruo Sone, Ayumi Abe, Sarah E. Calvo, Luis M. Corrochano, Reinhard Engels, Jianmin Fu, Wilhelm Hansberg, Jung-Mi Kim, Chinnappa D. Kodira, Michael J. Koehrsen, Bo Liu, Diego Miranda-Saavedra, Sinead O'Leary, Lucila Ortiz-Castellanos, Russell Poulter, Julio Rodriguez-Romero, José Ruiz-Herrera, Yao-Qing Shen, Qiandong Zeng, James Galagan, Bruce W. Birren, Christina A. Cuomo, Brian L. Wickes
Li-Jun Ma
Rhizopus oryzae is the primary cause of mucormycosis, an emerging, life-threatening infection characterized by rapid angioinvasive growth with an overall mortality rate that exceeds 50%. As a representative of the paraphyletic basal group of the fungal kingdom called “zygomycetes,” R. oryzae is also used as a model to study fungal evolution. Here we report the genome sequence of R. oryzae strain 99–880, isolated from a fatal case of mucormycosis. The highly repetitive 45.3 Mb genome assembly contains abundant transposable elements (TEs), comprising approximately 20% of the genome. We predicted 13,895 protein-coding genes not overlapping TEs, many of which are paralogous …
E-Science @ Umass: Anticipating And Supporting E-Science Activities At The University Of Massachusetts, Maxine G. Schmidt, Rebecca Reznik-Zellen
E-Science @ Umass: Anticipating And Supporting E-Science Activities At The University Of Massachusetts, Maxine G. Schmidt, Rebecca Reznik-Zellen
Maxine G Schmidt
In March of 2008 an Ad Hoccommittee of Science Librarians from the University of Massachusetts Five Campus System convened to discuss the challenges of e-science and prepare the Libraries for their role in e-science initiatives. Three primary outcomes intended to support e-science activities emerged from the work of the Ad Hoc committee.
Fluorescence Correlation Spectroscopy Of Phosphatidylinositolspecific Phospholipase C Monitors The Interplay Of Substrate And Activator Lipid Binding, Mingming Pu, Mary F. Roberts, Anne Gershenson
Fluorescence Correlation Spectroscopy Of Phosphatidylinositolspecific Phospholipase C Monitors The Interplay Of Substrate And Activator Lipid Binding, Mingming Pu, Mary F. Roberts, Anne Gershenson
Anne Gershenson
Phosphatidylinositol-specific phospholipase C (PI-PLC) enzymes simultaneously interact with the substrate, PI, and with non-substrate lipids such as phosphatidylcholine (PC). For Bacillus thuringiensis PI-PLC these interactions are synergistic with maximal catalytic activity observed at low to moderate mole fractions of PC (XPC) and maximal binding occurring at low mole fractions of anionic lipids. It has been proposed that residues in α helix B help modulate membrane binding and that dimerization on the membrane surface both increases affinity for PC and activates PI-PLC yielding the observed PI/PC synergy. Vesicle binding and activity measurements using a variety of PI-PLC mutants support many aspects …
A Toc159 Import Receptor Mutant, Defective In Hydrolysis Of Gtp, Supports Preprotein Import Into Chloroplasts, Birgit Agne, Sibylle Infanger, Fei Wang, Valère Hofstetter, Gwendoline Rahim, Meryll Martin, Dong Wook Lee, Inhwan Hwang, Danny Schnell, Felix Kessler
A Toc159 Import Receptor Mutant, Defective In Hydrolysis Of Gtp, Supports Preprotein Import Into Chloroplasts, Birgit Agne, Sibylle Infanger, Fei Wang, Valère Hofstetter, Gwendoline Rahim, Meryll Martin, Dong Wook Lee, Inhwan Hwang, Danny Schnell, Felix Kessler
Danny Schnell
The heterotrimeric Toc core complex of the chloroplast protein import apparatus contains two GTPases, Toc159 and Toc34, together with the protein-conducting channel Toc75. Toc159 and Toc34 are exposed at the chloroplast surface and function in preprotein recognition. Together, they have been shown to facilitate the import of photosynthetic proteins into chloroplasts in Arabidopsis. Consequently, the ppi2 mutant lacking atToc159 has a non-photosynthetic albino phenotype. Previous mutations in the conserved G1 and G3 GTPase motifs abolished the function of Toc159 in vivo by disrupting targeting of the receptor to chloroplasts. Here, we demonstrate that a mutant in a conserved G1 lysine …
E-Science @ The University Of Massachusetts, Maxine G. Schmidt, Rebecca Reznik-Zellen, Raquel Rivera, Cecilia P. Mullen
E-Science @ The University Of Massachusetts, Maxine G. Schmidt, Rebecca Reznik-Zellen, Raquel Rivera, Cecilia P. Mullen
Maxine G Schmidt
e-Science @ the University of Massachusetts Abstract: What is e-Science and how can libraries and librarians support it? The University of Massachusetts takes a proactive approach to support network-enabled research on its campuses and provides examples where e-Science is already at work. Statement: “e-Science” is a term commonly used to describe research in a networked environment, a growing trend not only in the sciences, but the arts and humanities as well. e-Science creates both opportunities and challenges for academic libraries. The opportunities lie in leveraging the basic skill set that libraries and librarians already possess: the knowledge of and practical …