Abstract:
:Displacement of the fluorescent substrate analogue methylanthraniloyl ADP (mant-ADP) from kinesin by excess ATP results in a biphasic fluorescent transient. The pH and microtubule dependence of the rates and amplitudes indicates that the two phases are produced by release of bound mant-ADP, with an excess of the 3'-isomer, followed by the subsequent relaxation of the free 2'- and 3'-isomers to their equilibrium distribution. The first phase for release of mant-ADP is accelerated by microtubules and occurs at the same rate as ADP release measured using [32P]ADP. The second phase is subject to base catalysis and occurs at the same rate as the isomerization of isolated 2'- or 3'-mant-ATP over a 100-fold range of rates. The bound mant-ADP isomers undergo isomerization rapidly when bound to kinesin at pH 8.2, whereas mant-ADP isomers interconvert only slowly when bound to myosin. No fluorescence resonance energy transfer occurs between the single tryptophan in the kinesin neck domain and bound mant-ADP, but efficient energy transfer does occur from protein tyrosine groups. The rate of mant-ADP release in the absence of microtubules is minimal (0.005 s-1) at pH 7-8, 2 mM Mg2+, and 25 mM KCl but is accelerated at lower pH (0.04 s-1 at pH 5.5) and either lower or higher [KCl] (0.01 and 0. 06 s-1 at 0 and 800 mM KCl, respectively). The microtubule-stimulated rate of ADP release is accelerated at low pH and inhibited by high concentrations of monovalent salts. Reduction of the free Mg2+ by addition of excess EDTA increases the release of mant-ADP from E.MgADP to 0.03 s-1. This acceleration at low Mg2+ likely represents sequential release of Mg2+ at 0.03 s-1 followed by rapid release of ADP, as the rate of ADP release from Mg-free E.ADP is fast (>0.5 s-1). At high Mg2+, rebinding of Mg2+ to E.ADP forces release of ADP from the E.MgADP complex at 0.005 s-1.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Cheng JQ,Jiang W,Hackney DDdoi
10.1021/bi972742jsubject
Has Abstractpub_date
1998-04-14 00:00:00pages
5288-95issue
15eissn
0006-2960issn
1520-4995pii
bi972742jjournal_volume
37pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::Monomeric sarcosine oxidase is a flavoenzyme that catalyzes the oxidation of the methyl group in sarcosine (N-methylglycine). Rapid reaction kinetic studies under anaerobic conditions at pH 8.0 show that the enzyme forms a charge transfer Michaelis complex with sarcosine (E-FAD(ox).sarcosine) that exhibits an intense ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0600852
更新日期:2006-05-16 00:00:00
abstract::Soybean lipoxygenase 1 was studied using limited proteolysis and active-site labeling to begin the structural characterization of the enzyme in solution. The serine proteases trypsin and chymotrypsin cleaved the large monomeric protein (95 kDa) into two large polypeptides, a C-terminal fragment of about 30 kDa and an ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00148a034
更新日期:1992-08-25 00:00:00
abstract::We compared the kinetics and thermodynamics of rhodamine phalloidin binding to actin purified from rabbit skeletal muscle, Acanthamoeba castellanii, and Saccharomyces cerevisiae in 50 mM KCl, 1 mM MgCl2, and pH 7.0 buffer at 22 degrees C. Filaments of S. cerevisiae actin bind rhodamine phalloidin more weakly than Acan...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi961047t
更新日期:1996-11-12 00:00:00
abstract::To investigate cytosine protonation and its influence on the sequence-dependent thermal stability of DNA triplexes in detail, we have employed homo- and heteronuclear NMR experiments on specifically (15)N-labeled oligodeoxynucleotides that were designed to fold into intramolecular triple helices of the pyrimidine moti...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi992630n
更新日期:2000-05-16 00:00:00
abstract::Apolipophorin III (apoLp-III) from the greater wax moth Galleria mellonella is an exchangeable insect apolipoprotein that consists of five amphipathic alpha-helices, sharing high sequence identity with apoLp-III from the sphinx moth Manduca sexta whose structure is available. To define the minimal requirement for apoL...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0013804
更新日期:2001-03-13 00:00:00
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::The thermotropic behavior of purified human complement protein C9 was investigated by high-sensitivity differential scanning calorimetry. When dissolved in physiological buffers (pH 7.2, 150 mM NaCl), C9 underwent three endothermic transitions with transition temperatures (Tm) centered at about 32, 48, and 53 degrees ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00240a035
更新日期:1991-07-02 00:00:00
abstract::The seven serotypes (A-G) of botulinum neurotoxins (BoNTs) function through their proteolytic cleavage of one of three proteins (SNAP-25, Syntaxin, and VAMP) that form the SNARE complex required for synaptic vesicle fusion. The different BoNTs have very specific protease recognition requirements, between 15 and 50 ami...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi052518r
更新日期:2006-03-14 00:00:00
abstract::Cyclic AMP receptor protein is involved in the regulation of more than 20 genes. A step in the mechanism of activation of transcription is to induce a significant bending of the DNA upon complex formation between specific DNA and the protein. The induced DNA bending and a structure of the protein-DNA complex were stud...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00137a011
更新日期:1992-06-09 00:00:00
abstract::Proteins have many distinct tertiary folds (Richardson, J. S. (1981) Adv. Prot. Chem. 34, 167-339). The term tertiary fold refers to the spatial organization of secondary structure elements (alpha-helices and beta-strands). It is not known when, in the process of protein folding, a native tertiary fold emerges. Here, ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00174a021
更新日期:1994-03-01 00:00:00
abstract::Ionizing radiation, free radicals, and reactive oxygen species produce hundreds of different DNA lesions. Clustered lesions are typical for ionizing radiation. They compromise the efficiency of the base excision repair (BER) pathway, and as a consequence, they are much more toxic and mutagenic than isolated lesions. D...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.6b00396
更新日期:2016-07-19 00:00:00
abstract::In polyglutamine (polyQ) containing fragments of the Huntington's disease protein huntingtin (htt), the N-terminal 17 amino acid htt(NT) segment serves as the core of α-helical oligomers whose reversible assembly locally concentrates the polyQ segments, thereby facilitating polyQ amyloid nucleation. A variety of aggre...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi3000929
更新日期:2012-04-03 00:00:00
abstract::The amidotransferase family of enzymes utilizes the ammonia derived from the hydrolysis of glutamine for a subsequent chemical reaction catalyzed by the same enzyme. The ammonia intermediate does not dissociate into solution during the chemical transformations. A well-characterized example of the structure and mechani...
journal_title:Biochemistry
pub_type: 杂志文章,评审
doi:10.1021/bi990871p
更新日期:1999-06-22 00:00:00
abstract::A novel truncated form (residues 1-214, with a randomized C-terminal tail) of the ligand-binding extracellular domain (ECD) of the human alpha1 glycine receptor (GlyR), with amino acids from the corresponding sequence of an acetylcholine binding protein (AChBP) substituted for two relatively hydrophobic membrane-proxi...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi800659x
更新日期:2008-09-16 00:00:00
abstract::The crystal structures of metyrapone- and 1-, 2-, and 4-phenylimidazole-inhibited complexes of cytochrome P-450cam have been refined to a nominal resolution of 2.1 A and compared with the 1.63-A camphor-bound structure. With the exception of 2-phenylimidazole, each of the inhibitors forms an N-Fe bond with the heme ir...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00399a022
更新日期:1987-12-15 00:00:00
abstract::In eukaryotes, a major route for ATP-dependent protein breakdown proceeds through covalent intermediates of target proteins destined for degradation and the highly conserved, 76 amino acid protein ubiquitin. In rabbit reticulocytes, it has been shown that hemin effectively inhibits this pathway by blocking the catabol...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00409a025
更新日期:1988-05-03 00:00:00
abstract::Calmodulin forms a covalent, one to one, complex with 3H-labeled norchlorpromazine isothiocyanate. Complex formation was monitored by high-performance liquid chromatography using a CN reverse-phase column which resolves calmodulin, the calmodulin-norchlorpromazine adduct, and norchlorpromazine isothiocyanate. Formatio...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00293a003
更新日期:1983-11-22 00:00:00
abstract::Synaptotagmin I is a synaptic vesicle protein that contains two C(2) domains and acts as a Ca(2+) sensor in neurotransmitter release. The Ca(2+)-binding properties of the synaptotagmin I C(2)A domain have been well characterized, but those of the C(2)B domain are unclear. The C(2)B domain was previously found to pull ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi010340c
更新日期:2001-05-22 00:00:00
abstract::Inducible nitric oxide synthase (iNOS) catalyzes the NADPH-dependent formation of nitric oxide (NO) and citrulline from L-arginine and O2. In addition to serving as substrate, L-arginine alters the enzyme's heme iron spin equilibrium, increases its NADPH oxidation, and promotes assembly of active dimeric iNOS from ina...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi952844e
更新日期:1996-05-07 00:00:00
abstract::We have investigated the loss of histone H1 from chromatin [D'Anna, J. A., Gurley, L. R., & Tobey, R. A. (1982) Biochemistry 21, 3991-4001] and the structure of chromatin from Chinese hamster (line CHO) cells blocked in early S phase by sequential use of isoleucine deprivation G1 block and 1 mM hydroxyurea (HU) blocka...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00293a027
更新日期:1983-11-22 00:00:00
abstract::The cystic fibrosis transmembrane conductance regulator (CFTR) functions in vivo as a cAMP-activated chloride channel. A member of the ATP-binding cassette superfamily of membrane transporters, CFTR contains two transmembrane domains (TMDs), two nucleotide-binding domains (NBDs), and a regulatory (R) domain. It is pre...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi035382a
更新日期:2004-02-03 00:00:00
abstract::The catalytic activity of protein-tyrosine phosphatases (PTPs) is mediated by a cysteine side chain which carries out a nucleophilic attack initiating the phosphate cleavage. Experimentally, it has been observed that the active site cysteine has a remarkably low pKa. In the present study, we have investigated the orig...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi971187i
更新日期:1998-04-21 00:00:00
abstract::Cholesterol (Chol) in phosphatidylcholine large unilamellar vesicles (PC LUV) modulated interaction of the bilayers with a class A amphipathic peptide, Ac-18A-NH2: Chol increased the peptide binding capacity and reduced the affinity together with the peptide-induced leakage of calcein from LUV. Similar effects of Chol...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi011885+
更新日期:2002-03-26 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::There are 10 transmembrane protein (TMEM) 16-family proteins in humans and mice. Among them, TMEM16F acts as a Ca(2+)-dependent phospholipid scramblase at the plasma membrane. However, how Ca(2+) activates TMEM16F's phospholipid-scramblase activity has not been elucidated. Here we found that in the presence of Ca(2+),...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.6b00176
更新日期:2016-06-14 00:00:00
abstract::GTPases are key players during cellular signaling. Phosphorylation of Rab proteins, which belong to the Ras superfamily of small GTPases regulating intracellular transport, has been implicated in the pathogenesis of Parkinson's disease. For Rab8a, it was shown that serine 111 phosphorylation (pS111) is dependent on th...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00516
更新日期:2019-08-20 00:00:00
abstract::We have studied the effect of melittin, a basic membrane-binding peptide, on Ca-ATPase activity and on protein and lipid dynamics in skeletal sarcoplasmic reticulum (SR), using time-resolved phosphorescence and fluorescence spectroscopy. Melittin completely inhibits Ca-ATPase activity, with half-maximal inhibition at ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00244a019
更新日期:1991-07-30 00:00:00
abstract::The rates of inactivation of BF1 adenosinetriphosphatase (BF1-ATPase) from Escherichia coli by 7-chloro-4-nitro-2,1,3-benzoxadiazole, 1-fluoro-2,4-dinitrobenzene, 2,4,6-trinitrobenzenesulfonate, phenylglyoxal, and N,N'-dicyclohexylcarbodiimide have been measured in the presence and absence of various concentrations of...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00531a011
更新日期:1982-01-19 00:00:00
abstract::High-precision studies of oxygen binding in hemoglobin (HbA0) solutions at near-physiological concentrations (2-12 mM heme; pHs 7.0-9.1; various buffers) have led to an unanticipated result: an unmeasurably low contribution from the triply ligated species. We have obtained this result from new differential oxygen-bind...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00387a038
更新日期:1987-06-30 00:00:00
abstract::Phosphoinositide 3-kinase gamma (PI3Kgamma) is activated by Gbetagamma release after stimulation of Galpha i -coupled receptors, involving a recruitment of the enzyme to the plasma membrane via interaction of the regulatory subunit p101 or p87 with Gbetagamma. The receptor-mediated release of Gbetagamma was, however, ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi800596b
更新日期:2008-10-28 00:00:00