Abstract:
:Muscle fiber contraction is regulated through calcium-induced changes in the conformation of troponin C. In this study, we explored the relationship between the stability of a specific helix in the protein and the metal ion affinity of associated binding sites. Serial replacement of the amino acid at position 130 caused the calcium affinity of the paired Ca2+/Mg2+ sites to be attenuated. In the crystal structures of chicken and turkey troponin C, position 130 is the N-cap residue of the G-helix. The ion affinities of variant proteins were shifted in the order Ile < Gly < Asp < Asn < Thr < Ser. Although differing in ion affinities, the variant proteins all exhibited high cooperativity. The results of this study point to a specific relationship between alpha-helix stability and ion affinity in troponin C and suggest that troponin C may be a paradigm for protein folding problems.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Trigo-Gonzalez G,Awang G,Racher K,Neden K,Borgford Tdoi
10.1021/bi00088a038subject
Has Abstractpub_date
1993-09-21 00:00:00pages
9826-31issue
37eissn
0006-2960issn
1520-4995journal_volume
32pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::The structure of a synthetic peptide corresponding to residues 1-45 of rabbit muscle adenylate kinase has been studied in aqueous solution by two-dimensional NMR, FTIR, and CD spectroscopy. This peptide, which binds MgATP and is believed to represent most of the MgATP-binding site of the enzyme [Fry, D.C., Kuby, S.A.,...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00410a009
更新日期:1988-05-17 00:00:00
abstract::A general kinetic model for catalysis by interfacial enzymes is developed. It couples the Michaelis-Menten catalytic turnover cycle at the interface with that in the aqueous phase through the distribution equilibria between the interface and the surrounding aqueous phase. Analysis under two limiting conditions fully d...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi970855x
更新日期:1997-11-25 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::Mouse epidermal growth factor (mEGF), a protein hormone effector molecule that regulates cellular development and division, has been investigated by using proton nuclear magnetic resonance techniques at 500 MHz. Well-resolved downfield aromatic and alpha-CH proton resonances (5.0-8.0 ppm) and an upfield ring current s...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00312a025
更新日期:1984-08-14 00:00:00
abstract::Site-directed mutagenesis and random mutagenesis were used to produce variants of subtilisin BPN' (Bacillus amyloliquefaciens) protease with variable surface adsorption properties. Protease adsorption and peptide hydrolysis rate were measured for these variants using a model substrate consisting of a peptide covalentl...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi951990h
更新日期:1996-03-12 00:00:00
abstract::The conformational properties of the magainin family of antimicrobial peptides in aqueous solution and in model membranes have been probed by Fourier transform infrared spectroscopy. The magainins were found to be structureless in aqueous solution at neutral pD, confirming other studies by Raman and circular dichroism...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00147a012
更新日期:1992-08-18 00:00:00
abstract::Human telomeric DNA consists of tandem repeats of the DNA sequence d(GGGTTA). Oligodeoxynucleotide telomere models such as d[A(GGGTTA)(3)GGG] (Tel22) fold in a cation-dependent manner into quadruplex structures consisting of stacked G-quartets linked by d(TTA) loops. NMR has shown that in Na(+) solutions Tel22 forms a...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi901357r
更新日期:2010-01-12 00:00:00
abstract::The deacetylation of UDP-3-O-[(R)-3-hydroxymyristoyl]-N-acetylglucosamine (UDP-3-O-acyl-GlcNAc) by LpxC is the committed reaction of lipid A biosynthesis. CHIR-090, a novel N-aroyl-l-threonine hydroxamic acid, is a potent, slow, tight-binding inhibitor of the LpxC deacetylase from the hyperthermophile Aquifex aeolicus...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi6025165
更新日期:2007-03-27 00:00:00
abstract::Induced fit has been postulated to be an important component of ligand interactions with proteins, including protein-DNA interactions. We imagined that the entropic cost of induced fit might be highly dependent on the local protein sequence context around critical contact residues. To investigate this question, we ana...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi960256a
更新日期:1996-06-25 00:00:00
abstract::Endonuclease V from bacteriophage T4 is a well characterized enzyme that initiates the repair of ultraviolet light induced pyrimidine dimers. Scission of the phosphodiester backbone between the pyrimidines within a dimer, or 3' to an abasic (AP) site, occurs by a beta-elimination mechanism. In addition, high concentra...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00027a031
更新日期:1995-07-11 00:00:00
abstract::Although the membrane-associated surfactant protein B (SP-B) is an essential component of lung surfactant, which is itself essential for life, the molecular basis for its activity is not understood. SP-B's biophysical functions can be partially mimicked by subfragments of the protein, including the C-terminus. We have...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0481895
更新日期:2004-12-07 00:00:00
abstract::MAP kinase kinase (MAPKK) is a dual specificity protein kinase that phosphorylates and activates MAP kinase in vivo. In this study, four mouse monoclonal single-chain Fv (scFv) antibodies (Y1-6, Y1-7, Y3-6, and Y3-11) that can specifically bind to Xenopus MAPKK were isolated from combinatorial scFv-displaying phage li...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi960956f
更新日期:1996-10-08 00:00:00
abstract::The number of self-cleaving ribozymes has increased sharply in recent years, giving rise to elaborations of the four known ribozyme catalytic strategies, α, β, γ, and δ. One such extension is utilized by the twister ribozyme, which is hypothesized to conduct δ, or general acid catalysis, via N3 of the syn adenine +1 n...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00742
更新日期:2019-12-03 00:00:00
abstract::A procedure for the preparation of coupling factor 1 (F1) from Escherichia coli lacking subunits delta and epsilon is described. Using chloroform and dimethyl sulfoxide, we can isolate F1 containing only subunits alpha, beta, and gamma [F1(alpha beta gamma)] directly from membrane vesicles in 10-mg quantities. Pure an...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00438a030
更新日期:1989-06-13 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::The affinity of various carbohydrates for the galactose/N-acetylgalactosamine-specific lectin of the rabbit liver was assessed by determining the effect of these carbohydrates on the binding of [125I]asialoorosomucoid (125I-ASOR) by the lectin. To obtain the concentration of the inhibitor that causes 50% reduction in ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00267a039
更新日期:1982-11-23 00:00:00
abstract::The majority of pre-steady-state kinetic investigations with HIV-1 reverse transcriptase (HIV-1 RT) have reported substoichiometric bursts (30-50%) of product formation in the initial reaction cycle. By using quantitative amino acid analysis, we have revised the extinction coefficient of the HIV-1 RT heterodimer and s...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi982163u
更新日期:1999-04-13 00:00:00
abstract::The folding kinetics of a 16-residue beta-hairpin (trpzip4) and five mutants were studied by a laser-induced temperature-jump infrared method. Our results indicate that mutations which affect the strength of the hydrophobic cluster lead to a decrease in the thermal stability of the beta-hairpin, as a result of increas...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi052039s
更新日期:2006-02-28 00:00:00
abstract::The proprotein convertase furin is a highly specific serine protease modifying and thereby activating proteins in the secretory pathway by proteolytic cleavage. Its substrates are involved in many diseases, including cancer and infections caused by bacteria and viruses. Understanding furin's substrate specificity is c...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.7b01124
更新日期:2018-02-13 00:00:00
abstract::The effect of Ca2+ binding on the circular dichroism (CD) and 270-MHz proton nuclear magnetic resonance (NMR) spectra of brain-specific S-100b calcium binding protein has been examined at two pH values, 8.5 and 7.5. At pH 8.5, S-100b protein binds two Ca2+ per monomer with Kd values of 6 x 10(-5) and 2 x 10(-4) M, whe...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00276a033
更新日期:1983-03-29 00:00:00
abstract::Stopped-flow total intensity and anisotropy experiments on single tryptophan containing mutants of yeast phosphoglycerate kinase (PGK) located in either the carboxy-terminal domain (W308 and W333), amino-terminal domain (W48 and W122), or "hinge" region (W194 and W399) were performed. The results obtained for single t...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00042a028
更新日期:1995-10-24 00:00:00
abstract::Single-strand-specific nucleases are a diverse and important group of enzymes that are able to cleave a variety of DNA structures present in duplex molecules. Nuclease SP, an enzyme from spinach, has been purified to apparent homogeneity, allowing for the unambiguous characterization of a number of its physical proper...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00104a026
更新日期:1991-10-08 00:00:00
abstract::Recent studies have indicated that CYP3A4 exhibits non-Michaelis-Menten kinetics for numerous substrates. Both homo- and heterotropic activation have been reported, and kinetic models have suggested multiple substrates within the active site. We provide some of the first physicochemical data supporting the hypothesis ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi051689t
更新日期:2005-11-01 00:00:00
abstract::Atrazine chlorohydrolase (AtzA) from Pseudomonas sp. ADP initiates the metabolism of the herbicide atrazine by catalyzing a hydrolytic dechlorination reaction to produce hydroxyatrazine. Sequence analysis revealed AtzA to be homologous to metalloenzymes within the amidohydrolase protein superfamily. AtzA activity was ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi020415s
更新日期:2002-12-03 00:00:00
abstract::Steady-state and femtosecond time-resolved optical methods have been used to compare the spectroscopic features and energy transfer dynamics of two systematically different light-harvesting complexes from the dinoflagellate Amphidinium carterae: main-form (MFPCP) and high-salt (HSPCP) peridinin-chlorophyll a-proteins....
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi061217u
更新日期:2006-11-28 00:00:00
abstract::Coiled coils are simple models for studying the association of two polypeptide chains to form a folded protein. Previous work has shown that the folding of a coiled coil can be described by a two-state transition between two unfolded monomeric peptide chains and a folded coiled coil dimer. Here we report the thermodyn...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi002161l
更新日期:2001-03-27 00:00:00
abstract::The fluorescence of the base analogue 2-aminopurine (2AP) was used to probe bacteriophage T4 DNA polymerase-induced conformational changes in the template strand produced during the nucleotide incorporation and proofreading reactions. 2AP fluorescence in DNA is quenched by 2AP interactions with neighboring bases, but ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi051462y
更新日期:2005-12-06 00:00:00
abstract::Hormone-sensitive lipase (HSL) is a rate-limiting enzyme in lipolysis that displays broad substrate specificity. HSL function is regulated by reversible phosphorylation that occurs within a 150 aa "regulatory module" of the protein. The current studies used mutational analysis to dissect the contribution of the "regul...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi049206t
更新日期:2005-02-15 00:00:00
abstract::The integral membrane protein diacylglycerol kinase (DGK) from Escherichia coli has been reversibly unfolded in a protein/detergent/mixed micelle system by varying the molar ratio of n-decyl beta-D-maltoside (DM) and sodium dodecyl sulfate (SDS). Unfolding was monitored by circular dichroism (CD) and ultraviolet (UV) ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi963095j
更新日期:1997-05-13 00:00:00
abstract::Studies utilizing the overexpression of individual isoforms indicated that both PKC-alpha and -delta promote a number of biological effects, including inhibition of DNA synthesis associated with rearrangements of the actin cytoskeleton in the murine B-cell lymphoma (Baf3), differentiation of the murine promyelocyte li...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9731807
更新日期:1998-04-21 00:00:00