Abstract:
:Two paramagnetic probes, viz., Mn2+ and Cr3+-ATP, were used to map distances to various loci on carbamoyl-phosphate synthetase by using NMR measurements. The paramagnetic influence of Mn2+ on the 1H of L-glutamate and L-ornithine was measured at 200 and 360 MHz. On the basis of these data, a correlation time for the paramagnetic interaction was determined (2 X 10(-9) s) and used to compute distances. These were in the range 7-9 A. Distances were also calculated from Mn2+ to the 13C-5 atom of glutamate (8.6 A), to the monovalent cation site (approximately 8 A), and to the phosphorus atoms of ATP in the Co(NH3)4ATP complex. For studies of the monovalent cation site relaxation rates of 6Li+, 7Li+, and 15NH4+ were measured. With Cr3+ ATP as a paramagnetic substrate analogue, Cr3+ to 13C distances were measured with the substrates HCO3(-) and [5-13C]glutamate. These NMR data provide the first topographical map of the arrangement of substrates, metal ion activators, and allosteric modifiers on the Escherichia coli carbamoyl-phosphate synthetase dimer.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Raushel FM,Anderson PM,Villafranca JJdoi
10.1021/bi00277a020subject
Has Abstractpub_date
1983-04-12 00:00:00pages
1872-6issue
8eissn
0006-2960issn
1520-4995journal_volume
22pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::Heparan sulfate (HS) proteoglycans (PGs) interact with a number of extracellular signaling proteins, thereby playing an essential role in the regulation of many physiological processes. These interactions are important for both normal signal transduction and regulation of the tissue distribution of signaling molecules...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi6025424
更新日期:2007-04-03 00:00:00
abstract::By suspending bovine rhodopsin in trehalose-water glass films, it is possible to trap photostates in the light-activation process. Because of the unusually high vitrification temperature of trehalose-water mixtures, this trapping can be accomplished at room temperature. This allows for a facile investigation of the sp...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00181a004
更新日期:1994-04-19 00:00:00
abstract::Pharaonis halorhodopsin (phR), the light-driven chloride ion pump from Natronobacterium pharaonis with C-terminal histidine tag, was expressed in Escherichia coli cells. The protein was solubilized with 0.1% n-dodecyl beta-D-maltopyranoside and purified with a nickel column. Removal of Cl- from the medium yields blue ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi011788g
更新日期:2002-02-19 00:00:00
abstract::Inheritance of apoE4 is a strong risk factor for the development of late-onset sporadic Alzheimer's disease (AD). Several lines of evidence suggest that apoE4 binds to the Alzheimer Abeta protein and, under certain experimental conditions, promotes formation of beta-sheet structures and amyloid fibrils. Deposition of ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0114269
更新日期:2001-12-11 00:00:00
abstract::Intrinsically disordered proteins (IDPs) are functionally active despite lacking a well-defined three-dimensional structure. Such proteins often undergo a disorder-to-order transition, or induced folding, when binding to their specific physiological partner. Because of cooperativity, the folding and binding steps typi...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.7b00350
更新日期:2017-07-25 00:00:00
abstract::The temperature dependence of biological rates at different scales (from individual enzymes to isolated organisms to ecosystem processes such as soil respiration and photosynthesis) is the subject of much historical and contemporary research. The precise relationship between the temperature dependence of enzyme rates ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.0c00530
更新日期:2020-09-29 00:00:00
abstract::Messenger RNA degradation is an important component of overall gene expression. During the final step of eukaryotic mRNA degradation, exoribonuclease 1 (Xrn1) carries out 5' → 3' processive, hydrolytic degradation of RNA molecules using divalent metal ion catalysis. To initiate studies of the 5' → 3' RNA decay machine...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b01035
更新日期:2020-04-21 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::The crystal structure of the particulate methane monooxygenase (pMMO) from Methylococcus capsulatus (Bath) has been reported recently [Lieberman, R. L., and Rosenzweig, A. C. (2005) Crystal structure of a membrane-bound metalloenzyme that catalyses the biological oxidation of methane, Nature 434, 177-182]. Subsequent ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi700883g
更新日期:2007-12-04 00:00:00
abstract::A topoisomer gel retardation assay has been used to examine the topological requirements for the formation of open promoter complexes on DNA minicircles carrying sigma 54-dependent promoters. In the absence of intercalators, individual topoisomers carrying both the nifL and nifF promoters could be resolved as discrete...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9701179
更新日期:1997-10-07 00:00:00
abstract::Binding studies of the interaction of immobilized 1alpha- and 17alpha-aminoalkyl derivatives of 5alpha-dihydrotestosterone (DHT) with purified N-deglycosylated homodimeric human sex hormone-binding globulin (SHBG) were performed using a surface plasmon resonance biosensor. These 1alpha- and 17alpha-derivatives with sp...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi035269k
更新日期:2003-11-25 00:00:00
abstract::The synthesis of sphingomyelin was studied in baby hamster kidney cells and in subcellular fractions derived from rat liver. During pulse-chase experiments with [3H]choline in tissue culture cells, the specific radioactivity of sphingomyelin continued to increase after the specific activities of phosphocholine and cyt...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00540a027
更新日期:1982-05-25 00:00:00
abstract::Oxidized cytochrome c oxidase exists in two reasonably well-defined conformations, a high-spin conformation with maximal absorption at 418 nm and a low-spin conformation with maximal absorption at 428 nm. The equilibrium between these two conformations has been studied as a function of pH, pressure, and temperature. p...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00265a009
更新日期:1982-10-26 00:00:00
abstract::The characterization of cod somatolactin (SL), a new pituitary protein belonging to the growth hormone/prolactin family, is described. Cod SL has a molecular weight of 26 kDa and consists of 209 amino acids, of which eight are Cys. The protein has three disulfide bonds between residues Cys5-Cys15, Cys65-Cys181, and Cy...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00220a010
更新日期:1991-02-12 00:00:00
abstract::Known crystal structures of class II aminoacyl-tRNA synthetases complexed to their cognate tRNAs reveal that critical acceptor stem contacts are made by the variable loop connecting the beta-strands of motif 2 located within the catalytic core of class II synthetases. To identify potential acceptor stem contacts made ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi001835p
更新日期:2000-12-19 00:00:00
abstract::A heparin-induced conformational change is required to convert antithrombin from a slow to a fast inhibitor of factor Xa. It has been proposed [van Boeckel et al. (1994) Nat. Struct. Biol. 1, 423-425] that the reactive center residue P14 is inserted into beta-sheet A in native antithrombin and is displaced from the be...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9604643
更新日期:1996-07-02 00:00:00
abstract::Bleeding, the most serious complication of thrombolytic therapy with tissue-type plasminogen activator (t-PA), is thought to result from lysis of fibrin in hemostatic plugs and from the systemic lytic state caused by unopposed plasmin. One mechanism by which systemic plasmin can impair hemostasis is by partially degra...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0525730
更新日期:2006-04-04 00:00:00
abstract::Alzheimer's disease is a debilitating neurodegenerative disorder whose pathology has been linked to the aggregation and deposition of the amyloid β-peptide (Aβ) in neural tissue. A truly effective therapeutic agent remains elusive, and attention has recently turned to the use of natural products as effective antiaggre...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi300113x
更新日期:2012-07-31 00:00:00
abstract::Peptide deformylase (EC 3.5.1.31) catalyzes the removal of a formyl group from the N-termini of nascent ribosome-synthesized polypeptides, an obligatory step during protein maturation in eubacteria. Since its discovery in crude Escherichia coli extracts 3 decades ago, the deformylase has resisted all attempts of purif...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi971155v
更新日期:1997-11-11 00:00:00
abstract::The envelope glycoprotein (G protein) of vesicular stomatitis virus probably exists in the viral envelope as a trimer of identical subunits. Depending on the conditions of solubilization, G protein may dissociate into monomers. G protein solubilized with the detergent octyl glucoside was shown to exist as oligomeric f...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00462a002
更新日期:1990-03-13 00:00:00
abstract::The third and most recently identified Parkinson's disease-linked variant of the neuronal protein alpha-synuclein to be identified (E46K) results in widespread brain pathology and early onset Parkinson symptoms (Zarranz et al. (2004) Ann. Neurol. 55, 164-173). Herein, we present biochemical and biophysical characteriz...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi7000246
更新日期:2007-06-19 00:00:00
abstract::A recirculating Langendorff heart preparation is used to characterize the endogenous antithrombin associated reversibly with murine vascular endothelium. Rat hearts are perfused clear of blood and then recirculated with a physiological salt solution. Addition of heparin educes antithrombin activity continuously into t...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00169a024
更新日期:1994-01-25 00:00:00
abstract::Yeast actin mutants with acidic residues at the N terminus either neutralized (DNEQ) or deleted (delta-DSE) were used to assess the role of N-terminal acidic residues in the interactions of actin with myosin in the contractile cycle. Cosedimentation experiments revealed an approximately 3-fold decrease in the binding ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi962388+
更新日期:1996-12-24 00:00:00
abstract::Nucleic acid aptamers are rapidly gaining prominence as diagnostic tools, targeting reagents, and potential therapeutics. To extend the use of aptamers into the biochemical analysis of protein interactions on the surface of live cells, we converted an enzymatically generated RNA aptamer into a photo-cross-linkable aff...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi8004208
更新日期:2008-11-18 00:00:00
abstract::Steady-state and transient-state analysis of Coprinus cinereus peroxidase, CIP (identical to Arthromyces ramosus peroxidase), was used to characterize the kinetics of the three fundamental steps in heme peroxidase catalysis: compound I (cpd I) formation, cpd I reduction, and compound II (cpd II) reduction. The rate co...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi970387r
更新日期:1997-08-05 00:00:00
abstract::Purified subunits of intermediate filaments obtained from a variety of tissues and cell types contain O-phosphoserine and, in some cases, smaller amounts of O-phosphothreonine. The O-phosphoserine content was estimated by reaction of performic acid oxidized subunits with methylamine in NaOH. Decamin of BHK-21 and CHO ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00530a030
更新日期:1982-01-05 00:00:00
abstract::The X-ray crystal structure of the At5g18200.1 protein has been determined to a nominal resolution of 2.30 A. The structure has a histidine triad (HIT)-like fold containing two distinct HIT-like motifs. The sequence of At5g18200.1 indicates a distant family relationship to the Escherichia coli galactose-1-P uridylyltr...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi052232m
更新日期:2006-03-14 00:00:00
abstract::The structural, electronic, and catalytic properties of cytochrome P450cam are subtly altered when the cysteine that coordinates to the heme iron is replaced with a selenocysteine. To map the effects of the sulfur-to-selenium substitution on the individual steps of the catalytic cycle, we conducted a comparative kinet...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.5b00939
更新日期:2015-11-10 00:00:00
abstract::CytA is a member of a functionally defined family of insecticidal delta-endotoxins occurring in parasporal crystals of Bacillus thuringiensis var. israelensis. We investigated the ability of CytA to permeabilize the membrane and release fluorescence marker molecules from unilamellar lipid vesicles. Both protoxin (27 k...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi960970s
更新日期:1996-09-03 00:00:00
abstract::The stable tyrosine radical YD. (tyrosine 160 in the D2 polypeptide) in photosystem II (PSII) exhibits nonexponential electron spin-lattice relaxation transients at low temperature. As previously reported, the tetranuclear Mn complex in PSII significantly enhances the spin-lattice relaxation of YD.. However, in Mn-dep...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00117a033
更新日期:1992-01-21 00:00:00