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Progress in standardizing and harmonizing thyroid function tests
clinical laboratory tests harmonization international iodine standardization
2018/12/14
Iodine is an essential component of thyroid hormone. Because thyroid hormone synthesis is affected by iodine deficiency on the one hand and by excess iodine intake on the other, thyroid function bioma...
目的：探讨牡蛎肽对免疫抑制小鼠的免疫调节作用及可能机制。方法：以环磷酰胺（cyclophosphamide，CTX）致免疫低下雌性ICR小鼠为动物模型，观察不同剂量牡蛎肽（0.5 g/kg低剂量组、1.0 g/kg中剂量组、2.0 g/kg高剂量组）干预15 d后对小鼠体重、免疫器官相对重量、免疫器官显微结构、外周血白细胞数目、T淋巴细胞亚群百分比、血清中的细胞因子浓度以及骨髓有核细胞数和DNA含...
Dissecting Proton Delocalization in an Enzyme’s Hydrogen Bond Network with Unnatural Amino Acids
Dissecting Proton Delocalization Enzyme’s Hydrogen Bond Network Unnatural Amino Acids
2016/5/25
Extended hydrogen bond networks are a common structural motif of enzymes. A recent analysis proposed quantum delocalization of protons as a feature present in the hydrogen bond network spanning a tria...
Short Hydrogen Bonds and Proton Delocalization in Green Fluorescent Protein (GFP)
Short Hydrogen Bonds Proton Delocalization Green Fluorescent Protein GFP
2016/5/25
Short hydrogen bonds and specifically low-barrier hydrogen bonds (LBHBs) have been the focus of much attention and controversy for their possible role in enzymatic catalysis. The green fluorescent pro...
Quantum delocalization of protons in the hydrogen-bond network of an enzyme active site
ab initio path integral molecular dynamics enzyme hydrogen bonding nuclear quantum effects proton delocalization
2016/5/25
Enzymes use protein architectures to create highly specialized structural motifs that can greatly enhance the rates of complex chemical transformations. Here, we use experiments, combined with ab init...
Ground-state Proton Transfer Kinetics in Green Fluorescent Protein (GFP)
Mitotic centromere-associated kinase (MCAK/Kif2C) Cellular senescence p53 Human primary cells
2016/5/25
Proton transfer plays an important role in the optical properties of green fluorescent protein (GFP). While much is known about excited-state proton transfer reactions (ESPT) in GFP occurring on ultra...
Choose Your Label wisely:Water-Soluble Fluorophores Often Interact with Lipid Bilayers
Water Proteins Lipid Bilayers Fluorescent Dyes Spectrometry, Fluorescence Protein Binding Solubility
2016/5/25
Water-soluble organic fluorophores are widely used as labels in biological systems. However, in many cases these fluorophores can interact strongly with lipid bilayers, influencing the interaction of ...
A conserved water-mediated hydrogen bond network defines bosutinib’s kinase selectivity
Humans Water Quinolines Nitriles Aniline Compounds src-Family Kinases Amino Acid Substitution Conserved Sequence Substrate Specificity Hydrogen Bonding
2016/5/25
Kinase inhibitors are important cancer drugs, but they tend to display limited target specificity, and their target profiles are often challenging to rationalize in terms of molecular mechanism. Here ...
DNA-Based Patterning of Tethered Membrane Patches
DNA Lipids Lipid Bilayers Molecular Structure Particle Size Surface Properties
2016/5/25
Solid-supported lipid bilayers are useful model systems for mimicking cellular membranes; however, the interaction of the bilayer with the surface can disrupt the function of integral membrane protein...
GFP Variants with Alternative β‑Strands and Their Application as Light-driven Protease Sensors:A Tale of Two Tails
Green Fluorescent Proteins Peptide Hydrolases Light
2016/5/25
Green fluorescent protein (GFP) variants that carry one extra strand 10 (s10) were created and characterized, and their possible applications were explored. These proteins can fold with either one or ...
Measuring Electrostatic Fields in Both Hydrogen Bonding and non-Hydrogen Bonding Environments using Carbonyl Vibrational Probes
Ribonucleases Molecular Probes Protein Conformation Vibration Acetophenones Molecular Dynamics Simulation Static Electricity Hydrogen Bonding Solvents
2016/5/25
Vibrational probes can provide a direct readout of the local electrostatic field in complex molecular environments, such as protein binding sites and enzyme active sites. This information provides an ...
A Thermodynamic Framework For Identifying Free Energy Inventories of Enzyme Catalytic Cycles
Steroid Isomerases Catalysis Hydrogen-Ion Concentration Thermodynamics Models, Chemical
2016/5/25
Pauling's suggestion that enzymes are complementary in structure to the activated complexes of the reactions they catalyze has provided the conceptual basis to explain how enzymes obtain their fantast...
Quantitative Dissection of Hydrogen Bond-Mediated Proton Transfer in the Ketosteroid Isomerase Active Site
active site environment computational modeling enzyme catalysis protein electrostatics protein semisynthesis
2016/5/25
Hydrogen bond networks are key elements of protein structure and function but have been challenging to study within the complex protein environment. We have carried out in-depth interrogations of the ...
Individual Vesicle Fusion Events Mediated by Lipid-anchored DNA
Cholesterol DNA Lipid Bilayers Phosphatidylcholines Phosphatidylethanolamines Membrane Fusion Unilamellar Liposomes
2016/5/25
Membrane fusion consists of a complex rearrangement of lipids and proteins that results in the merger of two lipid bilayers. We have developed a model system that employs synthetic DNA-lipid conjugate...
Formation and Analysis of Topographical Domains Between Lipid Membranes Tethered by DNA Hybrids of Different Lengths
Cell Membrane DNA Membrane Lipids Lipid Bilayers 1,2-Dipalmitoylphosphatidylcholine Microscopy, Fluorescence Base Sequence Molecular Sequence Data Models,Chemical Unilamellar Liposomes
2016/5/25
We recently described a strategy to prepare DNA-tethered lipid membranes either to fixed DNA on a surface or to DNA displayed on a supported bilayer [Boxer et al., J. Struct. Biol., 2009, 168, 190; Bo...