Scholarly Work - Chemistry & Biochemistry
Recent Submissions
-
Exposure of Methicillin-Resistant Staphylococcus aureus to Low Levels of the Antibacterial THAM-3ΦG Generates a Small Colony Drug-Resistant Phenotype
(2018-06)This study investigated resistance against trishexylaminomelamine trisphenylguanide (THAM-3ΦG), a novel antibacterial compound with selective microbicidal activity against Staphylococcus aureus. Resistance development was ... -
Marsarchaeota are an aerobic archaeal lineage abundant in geothermal iron oxide microbial mats
(2018-05)The discovery of archaeal lineages is critical to our understanding of the universal tree of life and evolutionary history of the Earth. Geochemically diverse thermal environments in Yellowstone National Park provide ... -
Mechanism of N2 Reduction Catalyzed by Fe-Nitrogenase Involves Reductive Elimination of H2
(2018-02)Of the three forms of nitrogenase (Mo-nitrogenase, V-nitrogenase, and Fe-nitrogenase), Fe-nitrogenase has the poorest ratio of N2 reduction relative to H2 evolution. Recent work on the Mo-nitrogenase has revealed that ... -
Cyanobacteriochrome-based photoswitchable adenylyl cyclases (cPACs) for broad spectrum light regulation of cAMP levels in cells
(2018-06)Class III adenylyl cyclases generate the ubiquitous second messenger cAMP from ATP often in response to environmental or cellular cues. During evolution, soluble adenylyl cyclase catalytic domains have been repeatedly ... -
Hydrogen Deuterium Exchange Mass Spectrometry of Oxygen Sensitive Proteins
(2018-05)The protocol detailed here describes a way to perform hydrogen deuterium exchange coupled to mass spectrometry (HDX-MS) on oxygen sensitive proteins. HDX-MS is a powerful tool for studying the protein structure-function ... -
Curating viscoelastic properties of icosahedral viruses, virus-based nanomaterials, and protein cages
(2018-06)The beauty, symmetry, and functionality of icosahedral virus capsids has attracted the attention of biologists, physicists, and mathematicians ever since they were first observed. Viruses and protein cages assemble into ... -
Two-photon absorption spectra of fluorescent isomorphic DNA base analogs
(2018-01)Fluorescent DNA base analogs and intrinsic fluorophores are gaining importance for multiphoton microscopy and imaging, however, their quantitative nonlinear excitation properties have been poorly documented. Here we present ... -
Changes in the stability and biomechanics of P22 bacteriophage capsid during maturation
(2018-06)The capsid of P22 bacteriophage undergoes a series of structural transitions during maturation that guide it from spherical to icosahedral morphology. The transitions include the release of scaffold proteins and capsid ... -
Proteomic analysis of human epileptic neocortex predicts vascular and glial changes in epileptic regions
(2018-04)Epilepsy is a common neurological disorder, which is not well understood at the molecular level. Exactly why some brain regions produce epileptic discharges and others do not is not known. Patients who fail to respond to ... -
Constitutive redox and phosphoproteome changes in multiple herbicide resistant Avena fatua L. are similar to those of systemic acquired resistance and systemic acquired acclimation
(2018-01)Plants are routinely confronted with numerous biotic and abiotic stressors, and in response have evolved highly effective strategies of systemic acquired resistance (SAR) and systemic acquired acclimation (SAA), respectively. ... -
Reactive and Scattering Dynamics of Hyperthermal O and O2 from a Carbon Fiber Network
(The Journal of Physical Chemistry C, 2018)We have investigated the scattering and reactive dynamics of a carbon fiber network at high surface temperatures. The experiments were performed with ground state atomic oxygen (O) and molecular oxygen (O2) with surface ... -
Distinct properties underlie flavin-based electron bifurcation in a novel electron transfer flavoprotein FixAB from Rhodopseudomonas palustris
(2018-02)A newly recognized third fundamental mechanism of energy conservation in biology, electron bifurcation, uses free energy from exergonic redox reactions to drive endergonic redox reactions. Flavin-based electron bifurcation ... -
Coenzyme M biosynthesis in bacteria involves phosphate elimination by a functionally distinct member of the aspartase/fumarase superfamily
(2018-04)For nearly 30 years, coenzyme M (CoM) was assumed to be present solely in methanogenic archaea. In the late 1990s, CoM was reported to play a role in bacterial propene metabolism, but no biosynthetic pathway for CoM has ... -
Decarboxylation involving a ferryl, propionate, and a tyrosyl group in a radical relay yields heme b
(2018-03)The H2O2-dependent oxidative decarboxylation of coproheme III is the final step in the biosynthesis of heme<em> b</em> in many microbes. However, the coproheme decarboxylase reaction mechanism is unclear. The structure of ... -
Semiochemicals to enhance herbivory by Diorhabda carinulata aggregations in saltcedar (Tamarix spp.) infestations
(2018-01)BACKGROUND: Semiochemicals for monitoring, attracting or repelling pest and beneficial organisms are increasingly deployed in agricultural and forest systems for pest management activities. However, the use of aggregation ... -
H/D exchange mass spectrometry and statistical coupling analysis reveal a role for allostery in a ferredoxin-dependent bifurcating transhydrogenase catalytic cycle
(2018-01)Recent investigations into ferredoxin-dependent transhydrogenases, a class of enzymes responsible for electron transport, have highlighted the biological importance of flavin-based electron bifurcation (FBEB). FBEB generates ... -
Structural Basis for the Mechanism of ATP-Dependent Acetone Carboxylation
(2017-08)Microorganisms use carboxylase enzymes to form new carbon-carbon bonds by introducing carbon dioxide gas (CO2) or its hydrated form, bicarbonate (HCO3 −), into target molecules. Acetone carboxylases (ACs) catalyze the ... -
Ultrafast Excited-State Deactivation of the Bacterial Pigment Violacein
(2017-08)The photophysical properties of the natural pigment violacein extracted from an Antarctic organism adapted to high exposure levels of UV radiation were measured in a combined steady-state and time-resolved spectroscopic ... -
X-ray crystallographic evidence for the simultaneous presence of axial and rhombic sites in cupredoxins: atomic resolution X-ray crystal structure analysis of pseudoazurin and DFT modelling
(2016-09)Crystal structure refinement of pseudoazurin from Achromobacter cycloclastes (AcPAz) was carried out at atomic (1.10 angstrom) resolution. The copper ion was localized in two positions at the metal binding site of AcPAz. ... -
Defining Electron Bifurcation in the Electron Transferring Flavoprotein Family
(2017-11)Electron bifurcation is the coupling of exergonic and endergonic redox reactions to simultaneously generate (or utilize) low and high potential electrons. It is the third recognized form of energy conservation in biology ...
RSS 1.0