Abstract:
:The Rhodnius prolixus aggregation inhibitor 1 (RPAI-1) is a novel blood-sucking salivary molecule that binds to ADP and attenuates platelet aggregation. In this report, we determine the binding constants and specificity of RPAI-1 for adenine nucleotides and its functional significance. By the Hummel-Dreyer method of equilibrium gel filtration, we show that RPAI-1 binds ADP with a K(0.5) of 48.6 plus minus 12.2 nM. RPAI-1 also displays high-affinity binding to ATP, AMP, Ado, AP4A, and alpha,beta Met ADP; however, RPAI-1 does not bind to inosine, guanosine, uridine, or cytidine. Binding is not modified by EDTA, indicating that Ado structure but not phosphate groups or Ca(2+) is necessary for binding. By computer simulation, we show that RPAI-1 is more effective in scavenging low but not high concentrations of ADP, in contrast to R. prolixus apyrase. RPAI-1 inhibits in vitro the ADP-dependent platelet-rich plasma aggregation by collagen (COLL), TRAP, PAF, and A23187 but did not block platelet aggregation by ristocetin or phorbol myristate acetate (PMA) and only slightly attenuated that by convulxin. RPAI-1 prolongs the closure time as assessed with PFA-100, when COLL-Epi but not COLL-ADP cartridges are employed. RPAI-1 also affects platelet-mediated hemostasis time and COLL-induced thrombus formation at high shear as assessed with the Clot Signature Analyzer. We conclude that RPAI-1 exerts an antiplatelet effect due to scavenging of low concentrations of ADP in vitro and in vivo. RPAI-1 is the first lipocalin described so far with unique specificity for adenine nucleotides.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Francischetti IM,Andersen JF,Ribeiro JMdoi
10.1021/bi011015ssubject
Has Abstractpub_date
2002-03-19 00:00:00pages
3810-8issue
11eissn
0006-2960issn
1520-4995pii
bi011015sjournal_volume
41pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::For the class A β-lactamase SHV-1, the kinetic and mechanistic properties of the clinically used inhibitor sulbactam are compared with the sulbactam analog substituted in its 6β position by a CH2OH group (6β-(hydroxymethyl)penicillanic acid). The 6β substitution improves both in vitro and microbiological inhibitory pr...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi501197t
更新日期:2015-01-27 00:00:00
abstract::Thrombin-activatable fibrinolysis inhibitor (TAFI) circulates as an inactive proenzyme of a carboxypeptidase B-like enzyme (TAFIa). It functions by removing C-terminal lysine residues from partially degraded fibrin that are important in tissue-type plasminogen activator mediated plasmin formation. TAFI was classified ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0115683
更新日期:2002-01-29 00:00:00
abstract::Taq and T7 DNA polymerases have become basic molecular biology "tools" for DNA sequence analysis. However, Taq, unlike T7 DNA polymerase, is strongly biased against the incorporation of 2',3'-dideoxynucleotide triphosphates (ddNTPs) indicating very different substrate selectivities. Equilibrium binding and rate consta...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi951682j
更新日期:1996-02-20 00:00:00
abstract::We describe a reconstitution of light-activated vertebrate photoreceptor GTPase and a purification of the GTP-binding protein (G protein), which is a component of the GTPase and modulates the light-activated phosphodiesterase (PDE) enzyme system. Rod outer segments (ROS) of bull frogs were treated with ethylenediamine...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00528a003
更新日期:1981-12-08 00:00:00
abstract::When rabbits are fed a diet supplemented with cholesterol, their plasma cholesterol levels increase markedly, and they develop atherosclerosis. Most of the plasma cholesterol exists as cholesteryl esters in very low density lipoproteins (VLDL) and intermediate-density lipoproteins (IDL). The triglyceride content of th...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00268a025
更新日期:1982-12-07 00:00:00
abstract::During cellular uptake of fluorescently labeled cell-penetrating peptides (CPPs), intense fluorescent signals are commonly observed in the nucleus of the cell, suggesting intracellular CPP relocation and potential binding to the genome of the host. We therefore investigated the interaction of the CPP HIV-1 Tat(47-57) ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi700416h
更新日期:2007-07-10 00:00:00
abstract::A conformational analysis of the valine side chains of ribonuclease T1 (RNase T1) was performed using NMR spectroscopy, in particular homonuclear (1H, 1H and 13C, 13C) and heteronuclear (1H, 15N and 1H, 13C) vicinal spin-spin coupling constants as obtained from E.COSY-type NMR experiments. The coupling constants relat...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00184a017
更新日期:1994-05-10 00:00:00
abstract::Despite many studies suggesting the role of enolpyruvate as a bound intermediate in the pyruvate kinase reaction, direct evidence for it has been lacking. By use of a combination of chemical trapping and isolation of a derivative, significant amounts of enzyme-bound enolpyruvate have now been demonstrated. The method ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00217a022
更新日期:1991-01-22 00:00:00
abstract::Anatoxin-a and homoanatoxin-a are two potent cyanobacterial neurotoxins. We recently reported the identification of the gene cluster responsible for the biosynthesis of these toxins as well as the in-vitro reconstitution of the first steps of this biosynthesis. We now report experimental evidence supporting the propos...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi200892a
更新日期:2011-08-23 00:00:00
abstract::Factor V and factor Va binding to single bilayer phospholipid vesicles was investigated by light-scattering intensity measurements. This technique allows the measurement of free and phospholipid-bound protein concentrations from which equilibrium constants can be obtained. As controls, the Ca2+-dependent phospholipid ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00587a023
更新日期:1979-10-02 00:00:00
abstract::In animals, the post-translational hydroxylation of hypoxia inducible factor (HIF) is a central mechanism for regulating gene expression in an oxygen-dependent manner. The oxygenase-catalyzed trans-4-prolyl hydroxylation of HIF-alpha increases its affinity for the von Hippel Lindau protein elongin B/C (VCB) ubiquitin ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi100358t
更新日期:2010-08-17 00:00:00
abstract::The [2Fe-2S] cluster of the Rieske iron-sulfur protein is held between two loops of the protein that are connected by a disulfide bridge. We have replaced the two cysteines that form the disulfide bridge in the Rieske protein of Saccharomyces cerevisiae with tyrosine and leucine, and tyrosine and valine, to evaluate t...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi035344r
更新日期:2003-11-25 00:00:00
abstract::Carboxymethylation with 14 C-labeled iodoacetate of cysteine residues in wild-type beta-galactosidase from Escherichia coli and in a defective beta-galactosidase from deletion mutant strain M15 was investigated in order to determine accessible positions in the tetrameric wild-type form and the dimeric mutant M15 prote...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00617a015
更新日期:1978-11-28 00:00:00
abstract::The purified PBS2 phage-coded inhibitor of uracil-DNA glycosylase (Ura-DNA glycosylase) from Bacillus subtilis has been tested for its ability to inhibit this enzyme isolated from other prokaryotic and from eukaryotic sources. In addition, the inhibitor has been assayed for its effect on DNA glycosylases specific for ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00524a027
更新日期:1981-10-13 00:00:00
abstract::The solution structure of Cucurbita maxima trypsin inhibitor-V (CMTI-V), which is also a specific inhibitor of the blood coagulation protein, factor XIIa, was determined by 1H NMR spectroscopy in combination with a distance-geometry and simulated annealing algorithm. Sequence-specific resonance assignments were made f...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00015a034
更新日期:1995-04-18 00:00:00
abstract::The two disparate functions of DCoH1 (dimerization cofactor of HNF-1)/PCD (pterin-4a-carbinolamine dehydratase) are associated with a change in oligomeric state. DCoH dimers enhance the activity of the diabetes-associated transcription factor HNF-1α (hepatocyte nuclear factor-1α), while the PCD activity of DCoH1 homot...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi1015056
更新日期:2010-11-30 00:00:00
abstract::Vibrational frequencies associated with FeC and CO stretching and FeCO bending modes have been determined via resonance Raman (RR) and infrared (IR) spectroscopy for cytochrome c peroxidase (CCP) mutants prepared by site-directed mutagenesis. These include the bacterial "wild type", CCP(MI), and mutations involving gr...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00415a015
更新日期:1988-07-26 00:00:00
abstract::The C-terminus of interferon-gamma (IFNgamma) contains a nuclear localization sequence (NLS) required for the activation and nuclear translocation of the transcription factor STAT1alpha and induction of IFNgamma-activated genes. On the basis of this and other studies, we developed a peptide mimetic of IFNgamma that po...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi036213t
更新日期:2004-05-11 00:00:00
abstract::We have investigated the role of the labile terminal domains of the core histones on the stability of the subunits of the protein core of the nucleosome by studying the thermodynamic behavior of the products of limited trypsin digestion of these subunits. The thermal stabilities of the truncated H2A-H2B dimer and the ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0110140
更新日期:2001-10-30 00:00:00
abstract::Legumain (asparaginyl endopeptidase) is the only protease with a preference for cleavage after asparagine residues. Increased legumain activity is a hallmark of inflammation, neurodegenerative diseases, and cancer, and legumain inhibitors have exhibited therapeutic effects in mouse models of these pathologies. Improve...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00821
更新日期:2020-01-28 00:00:00
abstract::The existence of temperature optima in enzyme catalysis that occur before protein melting sets in can be described by different types of kinetic models. Such optima cause distinctly curved Arrhenius plots and have, for example, been observed in several cold-adapted enzymes from psychrophilic species. The two main expl...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.0c00705
更新日期:2020-10-13 00:00:00
abstract::The acetoacetate decarboxylase-like superfamily (ADCSF) is a little-explored group of enzymes that may contain new biocatalysts. The low level of sequence identity (∼20%) between many ADCSF enzymes and the confirmed acetoacetate decarboxylases led us to investigate the degree of diversity in the reaction and substrate...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00652
更新日期:2019-10-08 00:00:00
abstract::Postsynaptic polypeptide neurotoxins isolated from the venoms of elapid and hydrophid snakes exhibit the ability to bind selectively to and inhibit different types of receptors that function in nerve signal transmission. On the basis of their amino acid sequences and three-dimensional structures, these neurotoxins are...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00179a011
更新日期:1994-04-05 00:00:00
abstract::Reductive dehalogenation such as that catalyzed by iodotyrosine deiodinase (IYD) is highly unusual in aerobic organisms but necessary for iodide salvage from iodotyrosine generated during thyroxine biosynthesis. Equally unusual is the dependence of this process on flavin. Rapid kinetics have now been used to define th...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.5b00410
更新日期:2015-07-28 00:00:00
abstract::The intestinal fatty acid binding protein is composed of two beta-sheets surrounding a large interior cavity. There is a small helical domain associated with the portal for entry of the ligand into the cavity. Denaturation of the protein has been monitored in a residue-specific manner by collecting a series of two-dim...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi001518i
更新日期:2001-01-23 00:00:00
abstract::The three-dimensional structure of toxic shock syndrome toxin 1 (TSST-1) from Staphylococcus aureus has been determined and refined to an R value of 0.226 for data between 8- and 2.5-A resolution. Overall, the structure of TSST-1 is similar to that of another superantigen, staphylococcal enterotoxin B (SEB). The key d...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00213a001
更新日期:1993-12-21 00:00:00
abstract::Polyalanine (polyA) is the third-most prevalent homopeptide repeat in eukaryotes, behind polyglutamine and polyasparagine. Abnormal expansion of the polyA repeat is linked to at least nine human diseases, and the disease mechanism likely involves enhanced length-dependent aggregation. Because of the simplicity of its ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi201155g
更新日期:2011-11-01 00:00:00
abstract::We have purified and characterized a novel 30-kDa glycoprotein (gp30) with TGF alpha-like properties secreted from the estrogen receptor negative breast cancer cell line MDA-MB-231. This factor was immunoprecipitated by an anti-TGF alpha polyclonal antibody and also had TGF alpha-like biological activity, as assayed b...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00147a018
更新日期:1992-08-18 00:00:00
abstract::A 15-residue fragment within the major continuous domain of gp120 from HIV-1 that can bind independently to the CD4 receptor has been shown to have the property of behaving as a solvent polarity-dependent conformational switch. The switch behavior (cooperative transition from beta-sheet to helical conformation as a fu...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi952045w
更新日期:1996-01-16 00:00:00
abstract::KCNE1 is a single transmembrane protein that modulates the function of voltage-gated potassium channels, including KCNQ1. Hereditary mutations in the genes encoding either protein can result in diseases such as congenital deafness, long QT syndrome, ventricular tachyarrhythmia, syncope, and sudden cardiac death. Despi...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.5b00505
更新日期:2015-10-20 00:00:00