Abstract:
:Resonance Raman and UV-visible absorption spectra show that nickel(II) microperoxidase-11 (NiMP-11) is four-coordinate in aqueous solution in the pH range from 1.0 to 13.0. In aqueous solutions of NiMP-11 in the absence of cetyltrimethylammonium bromide (CTAB), NiMP-11 is aggregated. In CTAB micellar solutions, where aggregation of NiMP-11 does not occur, the Raman spectra of NiMP-11 are similar to that of nickel(II) cytochrome c (NiCyt-c). The presence of the peptide segment shifts the equilibrium heavily in favor of the nonplanar form, just as does the entire protein component in the case of NiCyt-c. This further elucidates the structural mechanism by which the protein segment ruffles the heme, most likely modulating the redox potential as indicated for the cytochromes c3 [Ma, J.-G., et al. (1998) Biochemistry 37, 12431-12442]. Furthermore, the hydrophobic environment that is provided by the CTAB micelle is found to be crucial to the native folding of the pentapeptide and formation of two hydrogen bonds in the peptide backbone. These two H-bonds act to contract the peptide segment exerting the force on the macrocycle that causes the ruffling and makes the redox potential more negative than if the heme were to remain planar. The structure of the heme and pentapeptide may also be associated with redox-linked triggering of the formation and release of cytochrome-protein complexes.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Ma JG,Vanderkooi JM,Zhang J,Jia SL,Shelnutt JAdoi
10.1021/bi982332asubject
Has Abstractpub_date
1999-03-02 00:00:00pages
2787-95issue
9eissn
0006-2960issn
1520-4995pii
bi982332ajournal_volume
38pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::Apurinic/apyrimidinic endonuclease 1 (APE1) is an Mg²⁺-dependent enzyme responsible for incising the DNA backbone 5' to an apurinic/apyrimidinic (AP) site. Here, we use rapid quench flow (RQF) techniques to provide a comprehensive kinetic analysis of the strand-incision activity (k(chemistry)) of APE1 acting on an aut...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi401218r
更新日期:2013-10-29 00:00:00
abstract::Recent results on the 102 residue protein U1A show that protein aggregation is not always slow and irreversible but may take place transiently in refolding studies on a millisecond time scale. In this study we observe a similar aggregation behavior with the classical two-state protein CI2. Since both U1A and CI2 appea...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9909997
更新日期:1999-10-05 00:00:00
abstract::The gene encoding enzyme I of the phosphoenolpyruvate:sugar phosphotransferase system from an Escherichia coli enzyme I mutant was cloned and sequenced. The mutation was shown to be a guanine to adenine transition resulting in an altered protein in which glycine-338 was replaced by aspartic acid. The enzyme I structur...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi952052k
更新日期:1996-01-09 00:00:00
abstract::Xylose isomerase (E.C. 5.3.1.5) catalyzes the interconversion of aldose and ketose sugars and has an absolute requirement for two divalent cations at its active site to drive the hydride transfer rates of sugar isomerization. Evidence suggests some degree of metal movement at the second metal site, although how this m...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi049812o
更新日期:2004-06-01 00:00:00
abstract::Caldesmon from chicken gizzard muscle has been examined for its ability to interact with caltropin using affinity chromatography and the fluorescent probe acrylodan. The action of caltropin on the inhibitory effect of caldesmon on actomyosin ATPase was also studied. Like calmodulin, caltropin could release the inhibit...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00162a031
更新日期:1992-12-01 00:00:00
abstract::The present paper reports a study on the equilibria and kinetics of the acid-alkaline transition and the azide binding reaction by ferric Aplysia myoglobin. A single completely reversible spectrophotometric titration curve is found over the pH range from similar to 5 to similar to 9, with an apparent pK equals to 7.5 ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00679a006
更新日期:1975-04-22 00:00:00
abstract::The molecule 3',6'-bis(4-guanidinobenzoyloxy)-5-[N'-(4-carboxyphenyl)thioureido[spirop]isobenzofuran-1-(3H),9'-[9H]xanthen]-3-one, abbreviated FDE, was designed and synthesized as a fluorogenic active-site titrant for serine proteases. It is an analogue of p-nitrophenyl p-guanidino-benzoate (NPGB) in which a fluoresce...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00518a010
更新日期:1981-07-21 00:00:00
abstract::The organization and interaction of chlorophylls (Chl) and the kinetics of the energy transfer in the core antenna of photosystem I (PSI) trimeric and monomeric complexes, isolated from Spirulina platensis with Triton X-100 have been studied by stationary and time-resolved fluorescence. At 295 K both complexes show an...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi970386z
更新日期:1997-11-11 00:00:00
abstract::The presence and subcellular localization of UDP-Gal:glucosylceramide beta 1----4galactosyltransferase (GalT-2) was investigated in rat liver. For this purpose, purified Golgi apparatus, endoplasmic reticulum, and plasma membrane fractions were prepared from the liver and used as the enzyme source for detecting GalT-2...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00224a021
更新日期:1991-03-12 00:00:00
abstract::The nitrogenase MoFe protein contains the active site metallocluster called FeMo-cofactor [7Fe-9S-Mo-homocitrate] that exhibits an S = 3/2 EPR signal in the resting state. No interaction with FeMo-cofactor is detected when either substrates or inhibitors are incubated with MoFe protein in the resting state. Rather, th...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi011571m
更新日期:2001-11-20 00:00:00
abstract::A metabolite of vitamin D has been isolated in pure form from incubation of 25-hydroxyvitamin D3 with embryonic chick calvarial cells that had been grown on Cytodex 1 microcarrier beads. The isolation involved dichloromethane extraction of the cells and incubation medium, followed by Sephadex LH-20 column chromatograp...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00274a012
更新日期:1983-03-01 00:00:00
abstract::Oxidative DNA damage can lead to cancer, and as enzymatic DNA repair systems become compromised during the aging process, the role of exogenous antioxidants becomes more critical. Here, we examined whether such non-enzymatic DNA repair can be effected by the common cellular antioxidant glutathione, investigating both ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00697
更新日期:2019-11-19 00:00:00
abstract::The unfolding equilibrium of recombinant (rNP) and natural variants of nucleoplasmin (NP) from Xenopus laevis has been analyzed using biochemical and spectroscopic techniques. In the presence of denaturing concentrations of guanidinium salts (GuHCl and GuSCN), both domains, core and tail, of the rNP pentamer unfold as...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi8002555
更新日期:2008-07-29 00:00:00
abstract::Proteogenomic identification of translated small open reading frames in humans has revealed thousands of microproteins, or polypeptides of fewer than 100 amino acids, that were previously invisible to geneticists. Hundreds of microproteins have been shown to be essential for cell growth and proliferation, and many reg...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.0c00672
更新日期:2020-10-27 00:00:00
abstract::Fluorometric titrations of papain, succinyl-papain, and the corresponding methylthio derivatives of Cys-25 (papain-S-SCH3 and succinyl-papain-S-SCH3) were determined. Removal of the methylthio group from Cys-25 resulted in an increase of approximately 4 pK units in the fluorometrically determined pK value. The corresp...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00504a600
更新日期:1981-01-06 00:00:00
abstract::The reaction of cytochrome c oxidase with hydrogen peroxide has been of great value in generating and characterizing oxygenated species of the enzyme that are identical or similar to those formed during turnover of the enzyme with dioxygen. Most previous studies have utilized relatively low peroxide concentrations (mi...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9916675
更新日期:1999-11-30 00:00:00
abstract::Gamma-aminobutyric acid type A receptors (GABA(A) receptors) are ligand-gated chloride channels that play a central role in signal transmission within the mammalian central nervous system. Compounds that modulate specific GABA(A) receptor subtypes containing the delta-subunit are scarce but would be valuable research ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi100119t
更新日期:2010-06-15 00:00:00
abstract::Four murine myeloma immunoglobulins, A4, A47N, U61, and E109, have been studied for their binding affinities with inulin and a series of oligosaccharides derived from inulin. The results indicate that the combining site of these immunoglobulins shows highest complementarity for a trifructofuranosyl sequence (A4 and A4...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00636a005
更新日期:1977-08-23 00:00:00
abstract::Mitomycins make up a group of antitumor natural products that are biosynthesized from aminohydroxybenzoic acid (AHBA) and N-acetylglucosamine (GlcNAc). While the biosynthetic gene cluster was reported two decades ago, the mechanism by which the two building blocks, AHBA and GlcNAc, are coupled during biosynthesis rema...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00379
更新日期:2019-06-25 00:00:00
abstract::Backbone dynamics in the [5',5"-2H2]2'-deoxythymidine labeled duplex dodecamer [d-(CGCGAAT*T*CGC)]2 have been investigated by solid-state 2H NMR. Quadrupolar echo line shapes, spin-lattice relaxation, and quadrupolar echo decay times were obtained over hydration levels ranging from W = 0.0 to 25.2 (moles of H2O/mole o...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00102a014
更新日期:1991-09-24 00:00:00
abstract::Carbamoylation and reductive methylation of tubulin have been shown previously to inhibit microtubule assembly, probably by attack on essential internal lysine residues [Mellado, W., Slebe, J., & Maccioni, R.B. (1982) Biochem. J. 203, 675-681; Szasz, J., Burns, R., & Sternlicht, H. (1982) J. Biol. Chem. 257, 3697-3704...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00403a027
更新日期:1988-02-09 00:00:00
abstract::Molecules that bind DNA via threading intercalation show high binding affinity as well as slow dissociation kinetics, properties ideal for the development of anticancer drugs. To this end, it is critical to identify the specific molecular characteristics of threading intercalators that result in optimal DNA interactio...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.7b01036
更新日期:2018-02-06 00:00:00
abstract::Five opsin cDNA clones were isolated from a goldfish retina cDNA library and sequenced. On the basis of homology to previously characterized visual pigments, one clone was identified as goldfish rod opsin and a second as a goldfish red cone opsin. Two rhodopsin-like clones were found to be similar to the chicken green...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00052a027
更新日期:1993-01-12 00:00:00
abstract::Isotope exchange studies show that beef liver fructokinase has a random kinetic mechanism in which release of fructose from the enzyme is slower than that catalytic reaction. The stickiness of fructose in the presence of MgATP is confirmed by isotope partition studies, which show it to be released 0.53 times as fast a...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00629a021
更新日期:1977-05-17 00:00:00
abstract::Locked nucleic acid (LNA) is a nucleic acid analogue containing one or more LNA nucleotide monomers with a bicyclic furanose unit locked in an RNA mimicking sugar conformation. LNA oligonucleotides display unprecedented hybridization affinity toward complementary single-stranded RNA and complementary single- or double...
journal_title:Biochemistry
pub_type: 杂志文章,评审
doi:10.1021/bi0485732
更新日期:2004-10-26 00:00:00
abstract::The role of the Na,K-ATPase beta-subunit in stabilization of ion-binding sites has been investigated. Treatment of the purified renal Na,K-ATPase with 0.25 M DTT at 40 degrees C for 1 h resulted in 50% loss of Rb occlusion, which correlates with partial reduction of S-S bridges in the extracellular portion of the beta...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00077a029
更新日期:1993-07-06 00:00:00
abstract::Fluorescence spectroscopic and kinetic analysis of photochemical activity, cofactor and substrate binding, and enzyme denaturation studies were performed with highly purified, recombinant pea NADPH:protochlorophyllide oxidoreductase (POR) heterologously expressed in Escherichia coli. The results obtained with an indiv...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0105025
更新日期:2001-10-23 00:00:00
abstract::The lipid peroxidation product 4-hydroxynonenal (4-HNE) is a signaling mediator with wide-ranging biological effects. In this paper, we report that disruption of mGsta4, a gene encoding the 4-HNE-conjugating enzyme mGSTA4-4, causes increased 4-HNE tissue levels and is accompanied by age-dependent development of obesit...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi702124u
更新日期:2008-03-25 00:00:00
abstract::The orientation of eukaryotic cytochromes P450, with respect to the membrane of the endoplasmic reticulum, has been investigated. There is now good evidence that the tertiary structure of these proteins is essentially the same as that of the soluble bacterial isoenzyme cytochrome P450CI, with the exception of an exten...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00215a011
更新日期:1991-01-08 00:00:00
abstract::The fluorescence polarization intensities from fluorescent probes and the electron paramagnetic resonance spectra from spin probes, specifically modifying elements of a biological assembly such as myosin sulfhydryl 1 (SH1) in muscle fibers, are interpreted in terms of probe order parameters using a model-independent m...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00116a029
更新日期:1992-01-14 00:00:00