Abstract:
:Prodan [6-propionyl-2-(dimethylamine)naphthalene] is a hydrophobic fluorescent probe which is extremely sensitive to both the polarity and the hydrogen-bond donating capacity of the solvent. In binary mixtures of solvents, the hydrogen-bond donating effect on Prodan fluorescence saturates at relatively low concentrations of protic solvent while the polarity effect is proportional to the mixture's dielectric constant. The fluorescence emission maximum is approximately a linear function of the dielectric constant in both protic and aprotic solvents, and this allows estimation of the dielectric constant in both environments. In phospholipid bilayers and biological membranes, Prodan exhibits two distinct emission peaks: blue (430-445 nm) and green (470-505 nm). Temperature determines the relative intensity of the two peaks, but their wavelengths depend on the type of membrane and appear to reflect a specific membrane environment. In phospholipid vesicles, alcohols reduce the fluorescence intensity of the blue peak and produce a red-shift in the emission maximum of the green peak. Taking the partition coefficients of the alcohols into account, short-chain alcohols are much more effective than longer-chain alcohols in red-shifting the emission maximum of the green peak. Alcohols have similar effects on Prodan fluorescence in liver microsomal and mitochondrial membranes, synaptosomal membranes, and red blood cell plasma membranes. However, in liver organelle membranes the red-shift of the green peak is the dominant effect while in plasma membranes the quenching of the fluorescence of the blue peak is dominant. These effects are observed at low (pharmacological) ethanol concentrations and provide a unique tool for probing the interactions of ethanol with biological membranes.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Biochemistryjournal_title
Biochemistryauthors
Rottenberg Hdoi
10.1021/bi00154a021subject
Has Abstractpub_date
1992-10-06 00:00:00pages
9473-81issue
39eissn
0006-2960issn
1520-4995journal_volume
31pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::Human immunoglobulin E (IgE) consists of 14 domains, each with the characteristic immunoglobulin fold structure. Compared with the 12-domain structure of immunoglobulin G (IgG), IgE has an additional pair of domains (C epsilon 2) in the Fc region in place of the hinge of IgG. The crystal structure of the 4-domain Fc f...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00044a023
更新日期:1995-11-07 00:00:00
abstract::Metal homeostasis and resistance in bacteria is maintained by a panel of metal-sensing transcriptional regulators that collectively control transition metal availability and mediate resistance to heavy metal xenobiotics, including As(III), Cd(II), Pb(II), and Hg(II). The ArsR family constitutes a superfamily of metal ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi100490u
更新日期:2010-08-10 00:00:00
abstract::Dehydroquinate synthase has been purified 9000-fold from Escherichia coli K-12 (strain MM294). The synthase is encoded by the aroB gene, which is carried by plasmid pLC29-47 from the Carbon-Clarke library. Construction of an appropriate host bearing pLC29-47 results in a strain that produces 20 times more enzyme than ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00314a036
更新日期:1984-09-11 00:00:00
abstract::While the iron-molybdenum cofactor (FeMoco) of nitrogenase, a constituent of the active site for nitrogen reduction, can be extracted into N-methylformamide (NMF) and pyrrollidinone, the inability to solubilize it in any other organic solvents has hampered further understanding of its structure and chemical properties...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00450a024
更新日期:1989-11-28 00:00:00
abstract::The expression of apoE mRNA in the adrenal gland is inversely correlated to steroidogenesis and directly correlated to the level of cholesteryl ester stores. To further investigate the relationship between apoE and cellular cholesterol homeostasis, several parameters of cholesterol metabolism in the murine Y1 adrenal ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00183a007
更新日期:1994-05-03 00:00:00
abstract::During translation, the small subunit of the ribosome rotates with respect to the large subunit primarily between two states as mRNA is being translated into a protein. At the termination of bacterial translation, class I release factors (RFs) bind to a stop codon in the A-site and catalyze the release of the peptide ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.7b00824
更新日期:2018-04-03 00:00:00
abstract::Coupling of bovine carboxypeptidase A with diazotized 5-amino-1H-tetrazole increases esterase activity, decreases peptidase activity slightly, and modifies one tyrosyl residue. Subsequent nitration of the azoenzyme has no further effect on esterase activity, decreases peptidase activity markedly, and modifies a second...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00603a005
更新日期:1978-05-16 00:00:00
abstract::Low-temperature electronic absorption and room temperature circular dichroism (CD) and magnetic circular dichroism (MCD) spectra are reported for ascorbate oxidase. Bands attributable to d-d electronic transitions in the type 1 (blue) coppers (2B2 ground state) have been observed at 5800, 10000, and 12000 cm-1 (1725, ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00510a044
更新日期:1981-03-31 00:00:00
abstract::The binding of rabbit globin mRNA to the 25-kDa cap binding protein eIF-4E from human erythrocytes was found to be 5.3-fold stronger than the binding of the cap analogue m7GpppG to eIF-4E [Gross et al. (1990) Biochemistry 29, 5008-5012]. In order to investigate whether this effect is due to the longer sequence of nucl...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00120a020
更新日期:1992-02-11 00:00:00
abstract::Upon cleavage of the reactive thioester bonds (Cys-949-Glx-952) of tetrameric human alpha 2-macroglobulin (alpha 2M) by methylamine, one sulfhydryl group per alpha 2M subunit is exposed. These identical sulfhydryl group sites were labeled with the thiol-specific nitroxide spin-labels (1-oxy-2,2,5,5-tetramethyl-3-pyrro...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00414a053
更新日期:1988-07-12 00:00:00
abstract::In the following, molecular simulations are used to reveal unexpected behavior within bacterial membranes. We show that lipopolysaccharide molecules found in these membranes form viscous amorphous solids when they are interlinked with monovalent and divalent cations. The bilayers exhibit both liquid and glassy charact...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.6b01063
更新日期:2017-03-21 00:00:00
abstract::Pulmonary surfactant forms a monolayer of lipids and proteins at the alveolar air/liquid interface. Although cholesterol is a natural component of surfactant, its function in surface dynamics is unclear. To further elucidate the role of cholesterol in surfactant, we used a captive bubble surfactometer (CBS) to measure...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0256532
更新日期:2002-12-17 00:00:00
abstract::Salts and polyamines have a variety of effects on the physical properties of DNA, including stabilization against thermal melting. We wished to gain greater insight into the mechanism of this stabilization by ascertaining its effect on the dynamics of base opening and closing reactions, as measured by NMR. Since the b...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00404a018
更新日期:1988-02-23 00:00:00
abstract::Tumor suppressor Nore1, its acronym coming from novel Ras effector, is one of the 10 members of the Rassf (Ras association domain family) protein family that have been identified. It is expressed as two mRNA splice variants, Nore1A and a shorter isoform, Nore1B. It forms homo- and heterocomplexes through its C-termina...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi3014642
更新日期:2013-02-12 00:00:00
abstract::Curcumin potentiates the phosphorylation-dependent activity of human cystic fibrosis transmembrane conductance regulator (CFTR) in Fe(3+)-dependent and Fe(3+)-independent manners. Although the Fe(3+)-dependent curcumin potentiation results from removal of endogenous inhibitory Fe(3+) at the interface of the regulatory...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.5b00219
更新日期:2015-05-12 00:00:00
abstract::Steroid sulfatases are responsible for the hydrolysis of 3beta-hydroxy steroid sulfates, such as cholesterol and pregnenolone sulfate, and have an important role in regulating the synthesis of estrogenic steroids, from estrone sulfate and dehydroepiandrosterone sulfate, in endocrine-dependent tumors. Although little i...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00036a025
更新日期:1995-09-12 00:00:00
abstract::The mechanism by which ATP binding transduces a conformational change in 70-kDa heat shock proteins that results in release of bound peptides remains obscure. Wei and Hendershot demonstrated that mutating Thr37 of hamster BiP to glycine impeded the ATP-induced conformational change, as monitored by proteolysis [(1995)...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi981510x
更新日期:1998-11-03 00:00:00
abstract::Protein kinase Calpha (PKCalpha) has been shown to contain two discrete activator sites with differing binding affinities for phorbol esters and diacylglycerols. The interaction of diacylglycerol with a low-affinity phorbol ester binding site leads to enhanced high-affinity phorbol ester binding and to a potentiated l...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi982778r
更新日期:1999-03-23 00:00:00
abstract::The salivary antimicrobial peptide histatin-5 is able to aggregate and fuse negatively charged small unilamellar vesicles, and this fusogenic activity is selectively induced by the presence of zinc ions. Circular dichroism spectroscopy shows that histatin-5, in the presence of negatively charged vesicles and zinc ions...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi990212c
更新日期:1999-07-27 00:00:00
abstract::Fructose-1,6-bisphosphate muscle aldolase is an essential glycolytic enzyme that catalyzes reversible carbon-carbon bond formation by cleaving fructose 1,6-bisphosphate to yield dihydroxyacetone phosphate (DHAP) and d-glyceraldehyde phosphate. To elucidate the mechanistic role of conserved amino acid Asp-33, Asn-33 an...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi8021558
更新日期:2009-06-02 00:00:00
abstract::Various omega-halogenated carboxy acids and amides were evaluated as potential active-site-directed reagents for alcohol dehydrogenase. 2-Bromoacetamide and bromoacetic and 3-bromopropionic acids inactivated the enzyme; AMP, NAD+, and NADH markedly decreased the rate of inactivation. Some omega-halogenated carboxyamid...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00694a034
更新日期:1975-11-18 00:00:00
abstract::Pancreatic phospholipase A(2) (PLA2) shows a strong preference for the binding to the anionic interface and a consequent allosteric activation. In this paper, we show that virtually all the preference is mediated through 3 (Lys-53, -56, and -120) of the 12 cationic residues of bovine pancreatic PLA2. The lysine-to-met...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi000740k
更新日期:2000-10-10 00:00:00
abstract::Electron spin polarized electron paramagentic resonance (ESP EPR) spectra were obtained with deuterated iron-removed photosynthetic bacterial reaction centers (RCs) to specifically investigate the effect of the rate of primary charge separation, metal-site occupancy, and H-subunit content on the observed P865+QA- char...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9630319
更新日期:1997-07-15 00:00:00
abstract::Despite a lack of convincing in vitro evidence and a number of sound refutations, it is widely accepted that renalase is an enzyme unique to animals that catalyzes the oxidative degradation of catecholamines in blood in order to lower vascular tone. Very recently, we identified isomers of β-NAD(P)H as substrates for r...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.5b00451
更新日期:2015-06-23 00:00:00
abstract::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 triad of tyrosines (Y(16), Y(32), and Y(57)) in the active site of ketosteroid isomerase (KSI), contributing to its unusual...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.5b00958
更新日期:2015-12-08 00:00:00
abstract::The self-association of rabbit muscle phosphofructokinase at pH 7.0 was investigated by velocity sedimentation. The process was demonstrated to be in a rapid, dynamic equilibrium. The concentration dependence of the weight-average sedimentation coefficient was monitored within the range of 10-750 microgram/mL. The sed...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00513a040
更新日期:1981-05-12 00:00:00
abstract::F62 LOS of Neisseria gonorrhoeae consists of two major LOS components; the higher and smaller molecular weight (MW) components were recognized by MAbs 1-1-M and 3F11 respectively. Base-line separation of the two major oligosaccharide (OS) components from F62 LOS was achieved by Bio-Gel P-4 chromatography after dephosp...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00107a028
更新日期:1991-10-29 00:00:00
abstract::Colibactins are genotoxic secondary metabolites whose biosynthesis is encoded in the clb gene cluster harbored by certain strains of gut commensal Escherichia coli. Using synthetic colibactin analogues, we previously provided evidence that colibactins alkylate DNA by addition of a nucleotide to an electrophilic cyclop...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.8b01023
更新日期:2018-11-13 00:00:00
abstract::NMR studies of the adenosine analog tubercidin have been carried out in the presence of Escherichia coli purine nucleoside phosphorylase (PNP) in order to characterize the conformation of the enzyme-complexed nucleoside. Although analysis of transferred NOE data at various enzyme/inhibitor ratios indicated a predomina...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00190a007
更新日期:1994-06-21 00:00:00
abstract::Halogen bonding is a weak chemical force that has so far mostly found applications in crystal engineering. Despite its potential for use in drug discovery, as a new molecular tool in the direction of molecular recognition events, it has rarely been assessed in biopolymers. Motivated by this fact, we have developed a p...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.7b00429
更新日期:2017-06-27 00:00:00