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 inorganic phosphate, ADP, ATP, or magnesium ion. Dissociation equilibrium constants and rate constants for the labeling reactions have been deduced from a quantitative treatment of the kinetic data. The results suggest that the essential Tyr, Lys, Arg, and Glu or Asp residues are probably located at the catalytic site of BF1-ATPase and that in addition to steric interference, the effect of charge interaction should also be considered in interpreting the kinetic data on the protection of BF1-ATPase by substrate molecules against inactivation by the above labeling reagents. Examination of the relative values of the rate constants for the labeling reactions in the presence and absence of inorganic phosphate, ADP, ATP, or magnesium ion, respectively, and the effect of NBD label on the rates of labeling of the essential guanidinium, amino, and carboxyl groups suggest that the arrangement of these four functional groups at the catalytic site of BF1 may be similar to that previously proposed for MF1-ATPase from bovine heart; namely, the essential amino group and the unusually reactive phenol group are probably located near the bound inorganic phosphate or the gamma-phosphate group of the bound ATP, the essential guanidinium group is probably located nearer to the alpha- or beta-phosphate group than to the gamma-phosphate group of the bound ATP or the bound inorganic phosphate, and the essential carboxylate group is probably complexed with a magnesium ion which it shares with the bound inorganic phosphate.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Ting LP,Wang JHdoi
10.1021/bi00531a011subject
Has Abstractpub_date
1982-01-19 00:00:00pages
269-75issue
2eissn
0006-2960issn
1520-4995journal_volume
21pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::The mutants Arg54-->Leu, Arg54-->Lys, Arg305-->Lys, Asp309-->Glu, and Trp317-->Phe, located at subsites 1 and 2 in glucoamylase from Aspergillus niger, provide insight into the importance of specific hydrogen bonds and hydrophobic interactions in substrate recognition, catalytic mechanism, and stability. As suggested ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00032a009
更新日期:1995-08-15 00:00:00
abstract::A mouse monoclonal anti-7-(O-carboxymethyl)oximinoestradiol antibody was photoaffinity labeled with two cross-reactive 6alpha- and 6beta-(5-azido-2-nitrobenzoyl)amido[17alpha-3H]estradiol photoreagents (6alpha- and 6beta-ANBA-[17alpha-3H]estradiol). Covalently bound radioactivity was found exclusively on the light cha...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi962645a
更新日期:1997-06-24 00:00:00
abstract::Phosphorylation of G protein-coupled receptors (GPCRs) terminates their ability to couple with and activate G proteins by increasing their affinity for arrestins. Unfortunately, detailed information regarding how GPCRs interact with the kinases responsible for their phosphorylation is still limited. Here, we purified ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.6b00328
更新日期:2016-06-07 00:00:00
abstract::The photoaddition of 4'-(hydroxymethyl)-4,5',8-trimethylpsoralen (HMT) to different conformational states of RNA was studied. Poly(U), poly(A,U) (random copolymer), poly(A-U) (alternating copolymer), poly(A) . poly(U) (double stranded), and poly(U) . poly(A) . poly(U) (triple stranded) were reacted with HMT at differe...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00535a040
更新日期:1982-03-16 00:00:00
abstract::The complete primary structure of the major component myoglobin from the Arctic minke whale, Balaenoptera acutorostrata, was determined by specific cleavage of the protein to obtain large peptides which are readily degraded by the automatic sequencer. Over 80% of the amino acid sequence was established from the three ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00623a023
更新日期:1977-02-22 00:00:00
abstract::The RelE and RelB proteins constitute the RNA interferase (toxin) and its cognate inhibitor (antitoxin) components of the Escherichia coli relBE toxin-antitoxin system. Despite the well-described functionality and physiological activity of this system in E. coli, no structural study was performed on the folding and st...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi701037e
更新日期:2007-10-30 00:00:00
abstract::Many proteins utilize segmental motions to catalyze a specific reaction. The Omega loop of triosephosphate isomerase (TIM) is important for preventing the loss of the reactive enediol(ate) intermediate. The loop opens and closes even in the absence of the ligand, and the loop itself does not change conformation during...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi049208d
更新日期:2004-09-14 00:00:00
abstract::The role of lateral diffusion in mitochondrial electron transport has been investigated by measuring the diffusion coefficients for lipid, cytochrome c, and cytochrome oxidase in membranes of giant mitoplasts from cuprizone-fed mice using the technique of fluorescence redistribution after photobleaching (FRAP). The di...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00331a017
更新日期:1985-05-07 00:00:00
abstract::We have performed a kinetic and thermodynamic analysis of 3D(pol) derivatives containing substitutions in the ribose-binding pocket with ATP analogues containing correct and incorrect sugar configurations. We find that Asp-238, a residue in structural motif A that is conserved in all RNA-dependent RNA polymerases, is ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi035429s
更新日期:2004-05-11 00:00:00
abstract::The channel of the purified acetylcholine receptor from Torpedo californica electric organ reconstituted in lipid vesicles was assayed by direct electrical recording using patch-clamp pipets. High-resistance seals were obtained by gentle suction of vesicles into the pipet or after the formation of lipid bilayers from ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00279a003
更新日期:1983-05-10 00:00:00
abstract::Here, we introduce the concept of the "seleno effect" in the study of oxidoreductases that catalyze thiol/disulfide exchange reactions. In these reactions, selenium can replace sulfur as a nucleophile, electrophile, or leaving group, and the resulting change in rate (the seleno effect) is defined as kS/ kSe. In soluti...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.8b00004
更新日期:2018-03-20 00:00:00
abstract::Restrictocin is a small basic protein produced by the fungus Aspergillus restrictus. It potently inhibits protein synthesis in eukaryotic cells by specifically cleaving a single phosphodiester bond in 28S rRNA. A histidine residue at position 49 in restrictocin has been implicated in its active site. A mutant of restr...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi971177h
更新日期:1997-11-04 00:00:00
abstract::Prolyl hydroxylase is a glycoprotein containing two nonidentical subunits, alpha and beta. The alpha subunit of prolyl hydroxylase isolated from 13-day-old chick embryos contains a single high mannose oligosaccharide having seven mannosyl residues. Two forms of alpha subunit have been shown to exist in enzyme purified...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00342a041
更新日期:1985-10-08 00:00:00
abstract::Six affinity reagents containing chemically reactive groups, either on the phosphate residue at the 5'-end or on the 5'- or 3'-end internucleoside phosphate linkages of the oligothymidylate primers, were used to covalently modify the human immunodeficiency virus type 1 reverse transcriptase (HIV-1 RT). After covalent ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00065a015
更新日期:1993-04-13 00:00:00
abstract::Mutations in the hydrophobic interior of proteins are generally thought to weaken the interactions only in their immediate neighborhood. This forms the basis of protein engineering-based studies of folding mechanism and function. However, mutational work on diverse proteins has shown that distant residues are thermody...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.6b00798
更新日期:2017-01-10 00:00:00
abstract::A peptide consisting of the first 21 residues of human myelin basic protein (MBP) was synthesized. The N-terminal alanine of portions was blocked in separate experiments with alkyl carboxylates varying in size from 2 to 10 carbon atoms. The effects of these different alkyl carboxylates at the N-terminus on the seconda...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00180a008
更新日期:1994-04-12 00:00:00
abstract::Room temperature phosphorescence techniques were used to study the structural and dynamic features of the tryptophan residues in bovine alpha-crystallin. Upon excitation at 290 nm, the characteristic signature of tryptophan phosphorescence was observed with an emission maximum at 442 +/- 2 nm. The phosphorescence inte...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00439a027
更新日期:1989-06-27 00:00:00
abstract::Indolethylamine-N-methyltransferase (INMT) is a Class 1 transmethylation enzyme known for its production of N,N-dimethyltryptamine (DMT), a hallucinogen with affinity for various serotonergic, adrenergic, histaminergic, dopaminergic, and sigma-1 receptors. DMT is produced via the action of INMT on the endogenous subst...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi500175p
更新日期:2014-05-13 00:00:00
abstract::Structural properties of the isolated extrinsic regulatory 33 kDa protein of the water-oxidizing complex were analyzed at different pH values. It was found that (a) titrations of the buffer capacity reveal a characteristic hysteresis effect that is unique for the 33 kDa subunit and is not observed for the other extrin...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi963115h
更新日期:1997-05-27 00:00:00
abstract::Recently, a new clathrin assembly protein (AP180) has been purified from coated vesicles of bovine brain (Ahle & Ungewickell, 1986). This protein has been shown to promote polymerization of clathrin into a homogeneous population of baskets under conditions where pure clathrin does not polymerize by itself. We have pur...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00416a040
更新日期:1988-08-09 00:00:00
abstract::The complex of tropomyosin and troponin binds to actin and inhibits activation of myosin ATPase activity and force production of striated muscles at low free Ca(2+) concentrations. Ca(2+) stimulates ATP activity, and at subsaturating actin concentrations, the binding of NEM-modified S1 to actin-tropomyosin-troponin in...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi048646h
更新日期:2004-12-07 00:00:00
abstract::Several phosphatidylinositol 4,5-bisphosphate (PtdInsP2)-regulated actin-binding proteins and most phosphoinositide-specific phospholipases C (PI-PLCs) comprise a basic amino acid motif (KxxxKxKK, where x denotes any amino acid), which was previously suggested to represent a PtdInsP2-binding site commonly present in t...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00015a023
更新日期:1995-04-18 00:00:00
abstract::Gene targeting by triplex-forming oligonucleotides (TFOs) has proven useful for gene modulation in vivo. Photoreactive molecules have been conjugated to TFOs to direct sequence-specific damage in double-stranded DNA. However, the photoproducts are often repaired efficiently in cells. This limitation has led to the sea...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi7024029
更新日期:2008-06-10 00:00:00
abstract::Phosphoprotein particles were isolated in their native state from the physiological fluid of the estuarine clam Rangia cuneata , and the characteristics of the mineral ion-protein complex which constitutes the native particle were investigated by using mineral ion binding and mineral ion exchange techniques. The parti...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00302a017
更新日期:1984-03-27 00:00:00
abstract::A stereochemical analysis has been carried out on two vinylpyruvate hydratases (VPH), which convert 2-hydroxy-2,4-pentadienoate to 2-keto-4S-hydroxypentanoate in meta-fission pathways. Bacterial strains with this pathway can use aromatic compounds as sole sources of energy and carbon. The analysis was carried out usin...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.6b00552
更新日期:2016-07-26 00:00:00
abstract::The first use of computer-simulation studies to examine heparin's structure has been reported. The product distributions obtained when porcine mucosal heparins were depolymerized with heparinase have been compared to computer-simulated distributions. The modeled distribution was relatively unaffected by the polydisper...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00347a045
更新日期:1985-12-17 00:00:00
abstract::Cations often deform the structure of regulatory proteins to affect a functional response, but for other protein functions a more passive effect is desired. For instance, it is shown here that in the conductance of Na+ by the gramicidin channel there appears to be no significant structural deformation of either the si...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi961170k
更新日期:1996-09-17 00:00:00
abstract::The nonspecific phospholipase C from Bacillus cereus is a zinc metalloenzyme that catalyzes the hydrolysis of phospholipids to yield diacylglycerol and a phosphate monoester. Glu-4 has been proposed as a potential candidate for the general base in the hydrolysis reaction and was shown to interact with the substrate he...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi972751s
更新日期:1998-03-24 00:00:00
abstract::With excitation at 406.7 nm, we have observed the resonance Raman enhancement of the bound v(N-O) stretch at approximately 1623 cm-1 in nitrosylhemoglobin A and nitrosylmyoglobin, indicating the existence of a charge-transfer transition underlying the strong Soret band. The v(Fe-NO) stretch at 551 cm-1 has also been d...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00535a005
更新日期:1982-03-16 00:00:00
abstract::A novel and efficient enzyme kinetics assay using electrospray ionization mass spectrometry was developed and applied to the bacterial carbohydrate sulfotransferase (NodST). NodST catalyzes the sulfuryl group transfer from 3'-phosphoadenosine 5'-phosphosulfate (PAPS) to chitobiose, generating 3'-phosphoadenosine 5'-ph...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi020457g
更新日期:2002-11-05 00:00:00