Abstract:
:Tyramine β-monooxygenase (TβM), the insect homologue of dopamine β-monooxygenase, is a neuroregulatory enzyme that catalyzes the β-hydroxylation of tyramine to yield octopamine. Mutation of the methionine (Met) ligand to Cu(M) of TβM, Met471Cys, yielded a form of TβM that is catalytically active but susceptible to inactivation during turnover [Hess, C. R., Wu, Z., Ng, A., Gray, E. E., McGuirl, M. M., and Klinman, J. P. (2008) J. Am. Chem. Soc. 130, 11939-11944]. Further, although the wild-type (WT) enzyme undergoes coordination of Met471 to Cu(M) in its reduced form, the generation of Met471Cys almost completely eliminates this interaction [Hess, C. R., Klinman, J. P., and Blackburn, N. J. (2010) J. Biol. Inorg. Chem. 15, 1195-1207]. The aim of this study is to identify the chemical consequence of the poor ability of Cys to coordinate Cu(M). We show that Met471Cys TβM is ~5-fold more susceptible to inactivation than the WT enzyme in the presence of the cosubstrate/reductant ascorbate and that this process is not facilitated by the substrate tyramine. The resulting 50-fold smaller ratio for turnover to inactivation in the case of Met471Cys prevents full turnover of the substrate under all conditions examined. Liquid chromatography-tandem mass spectrometry analysis of proteolytic digests of inactivated Met471Cys TβM leads to the identification of cysteic acid at position 471. While both Met and Cys side chains are expected to be similarly subject to oxidative damage in proteins, the enhanced reactivity of Met471Cys toward solution oxidants in TβM is attributed to its weaker interaction with Cu(I)(M).
journal_name
Biochemistryjournal_title
Biochemistryauthors
Osborne RL,Zhu H,Iavarone AT,Hess CR,Klinman JPdoi
10.1021/bi300456fsubject
Has Abstractpub_date
2012-09-25 00:00:00pages
7488-95issue
38eissn
0006-2960issn
1520-4995journal_volume
51pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::The inhibitory effects of guanosine 5'-(gamma-fluorotriphosphate) [GTP(gamma F)] on both the polymerization and the colchicine-dependent GTPase activity of calf brain tubulin have been studied. The results demonstrate that this analogue of GTP, with a fluorine atom on the gamma-phosphate, is a reversible competitive d...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00393a022
更新日期:1987-09-22 00:00:00
abstract::Escherichia coli DNA photolyase contains a stable flavin radical and a second chromophore (SC) of unknown structure. The effects of flash (both conventional and laser) excitation of either the radical alone or both the radical and the second chromophore have been investigated by variation of the excitation wavelengths...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00389a007
更新日期:1987-07-28 00:00:00
abstract::An endo-beta-galactosidase, which hydrolyzes the internal beta-galactosidic linkages of R----GlcNAc (or GalNAc) beta 1----3Gal beta 1----4GlcNAc (or Glc), was isolated from the culture supernatant of Diplococcus pneumoniae. The enzyme, named endo-beta-galactosidase DII, hydrolyzed linear N-acetyllactosamine repeating ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00330a008
更新日期:1985-04-23 00:00:00
abstract::The general view on Rhizobium chitolipooligosaccharides (CLOS) is that they are made in very low levels as diffusible molecules and are primarily secreted by the bacteria into the extracellular milieu where they interact with the host. However, the structural and predicted physicochemical properties of these amphiphil...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00011a041
更新日期:1995-03-21 00:00:00
abstract::The binding modes of four active site-directed, acylating inhibitors of human alpha-thrombin have been determined using X-ray crystallography. These inhibitors (GR157368, GR166081, GR167088, and GR179849) are representatives of a series utilizing a novel 5, 5-trans-lactone template to specifically acylate Ser195 of th...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9830359
更新日期:1999-06-22 00:00:00
abstract::To determine the active site cysteine residue in aldehyde dehydrogenase, we mutated amino acid residues 49, 162, and 302 of recombinantly expressed rat liver mitochondrial (class 2) aldehyde dehydrogenase. The C49A and C162A mutants were fully active tetrameric enzymes, although the C162A mutant was found to be highly...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00008a025
更新日期:1995-02-28 00:00:00
abstract::Alditol oxidase (AldO) from Streptomyces coelicolor A3(2) is a soluble monomeric flavin-dependent oxidase that performs selective oxidation of the terminal primary hydroxyl group of several alditols. Here, we report the crystal structure of the recombinant enzyme in its native state and in complex with both six-carbon...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi701886t
更新日期:2008-01-22 00:00:00
abstract::Src SH3 is a small all-beta-sheet protein composed of a single domain. We studied the folding behavior of src SH3 at various conditions by circular dichroism (CD), fluorescence, and X-ray solution scattering methods. On the src SH3 folding pathway, an alpha-helix-rich intermediate appeared not only at subzero temperat...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0618262
更新日期:2007-05-01 00:00:00
abstract::The nitrophorins are a family of proteins that use ferric heme to transport nitric oxide (NO) from the salivary glands of blood-sucking insects to their victims, resulting in vasodilation and reduced blood coagulation. We have refined atomic resolution structures of nitrophorin 4 (NP4) from Rhodnius prolixus complexed...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0109257
更新日期:2001-09-25 00:00:00
abstract::A dark state tertiary structure in the cytoplasmic domain of rhodopsin is presumed to be the key to the restriction of binding of transducin and rhodopsin kinase to rhodopsin. Upon light-activation, this tertiary structure undergoes a conformational change to form a new structure, which is recognized by the above prot...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi010746p
更新日期:2001-10-23 00:00:00
abstract::The ATP binding cassette (ABC) transporters ABCG2 and ABCB1 perform ATP hydrolysis-dependent efflux of structurally highly diverse compounds, collectively called allocrites. Whereas much is known about allocrite-ABCB1 interactions, the chemical nature and strength of ABCG2-allocrite interactions have not yet been asse...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.5b00649
更新日期:2015-10-13 00:00:00
abstract::Two mutant versions of Escherichia coli aspartate transcarbamylase were created by site-specific mutagenesis. Arg-234 of the 240s loop was replaced by serine in order to help deduce the function of the interactions that normally occur between Arg-234 and both Glu-50 and Gln-231 in the R state of the enzyme. The other ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00423a022
更新日期:1988-11-15 00:00:00
abstract::The alpha-helix [Pauling, L., Corey, R. B., & Branson, H. R. (1951) Proc. Natl. Acad. Sci. U.S.A. 37, 205-211] is a common motif in both proteins and peptides. Despite intense investigation, predictive understanding of helices is still lacking. A recent hypothesis [Presta, L. G., & Rose, G. D. (1988) Science 240, 1632...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00081a001
更新日期:1993-08-03 00:00:00
abstract::The gene product 61 primase protein from bacteriophage T4 was expressed as an intein fusion and purified to homogeneity. The primase binds one zinc ion, which is coordinated by four cysteine residues to form a zinc ribbon motif. Factors that influence the rate of priming were investigated, and a physiologically releva...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0108554
更新日期:2001-12-18 00:00:00
abstract::Histamine is released from mast cells and basophils by either immunological or nonimmunological mechanisms. Histamine, which is the most potent short acting mediator released from these cells, exerts its diverse biological actions by binding to cell surface histamine receptors. We report the affinity purification of h...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00182a008
更新日期:1994-04-26 00:00:00
abstract::Magic angle sample spinning (MASS) 13C NMR spectra have been obtained of bovine rhodopsin regenerated with retinal prosthetic groups isotopically enriched with 13C at C-5 and C-14. In order to observe the 13C retinal chromophore resonances, it was necessary to employ low temperatures (-15-----35 degrees C) to restrict...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00380a018
更新日期:1987-03-24 00:00:00
abstract::BtuB is a bacterial outer-membrane protein that transports vitamin B(12). Spectroscopic studies using site-directed spin labeling (SDSL) indicate that the N-terminus of BtuB undergoes a dramatic structural change from a docked (folded) to an undocked (unfolded) configuration upon substrate binding. However, this drama...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi035439t
更新日期:2003-11-18 00:00:00
abstract::In clostridial-type ferredoxins, each of the two [4Fe-4S]2+/+ clusters receives three of its four ligands from a CysXXCysXXCys motif. Azotobacter vinelandii ferredoxin I (AvFdI) is a seven-iron ferredoxin that contains one [4Fe-4S]2+/+ cluster and one [3Fe-4S]+/0 cluster. During the evolution of the 7Fe azotobacter-ty...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9810499
更新日期:1998-09-15 00:00:00
abstract::The respiratory nitric oxide reductase (NOR) from Paracoccus denitrificans catalyzes the two-electron reduction of NO to N(2)O (2NO + 2H(+) + 2e(-) --> N(2)O + H(2)O), which is an obligatory step in the sequential reduction of nitrate to dinitrogen known as denitrification. NOR has four redox-active cofactors, namely,...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi050524h
更新日期:2005-08-09 00:00:00
abstract::The lipid fatty acid composition of the cytoplasmic membranes of Escherichia coli can be varied by growing an unsaturated fatty acid auxotroph in the presence of different fatty acid supplements. Electron spin resonance (ESR) studies of spin-label partitioning into the cytoplasmic membranes of different lipid fatty ac...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00627a015
更新日期:1977-04-19 00:00:00
abstract::Protein methylation is a common post-translational modification with diverse biological functions. Methyllysine reader proteins are increasingly a focus of epigenetics research and play important roles in regulating many cellular processes. These reader proteins are vital players in development, cell cycle regulation,...
journal_title:Biochemistry
pub_type: 杂志文章,评审
doi:10.1021/acs.biochem.5b01073
更新日期:2016-03-22 00:00:00
abstract::Escherichia coli ribonucleotide reductase is an α2β2 complex that catalyzes the conversion of nucleoside 5'-diphosphates (NDPs) to deoxynucleotides (dNDPs). The active site for NDP reduction resides in α2, and the essential diferric-tyrosyl radical (Y(122)(•)) cofactor that initiates transfer of the radical to the act...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi101319v
更新日期:2011-03-01 00:00:00
abstract::The two flavodoxins (YkuN and YkuP) from Bacillus subtilis have been cloned, overexpressed in Escherichia coli and purified. DNA sequencing, mass spectrometry, and flavin-binding properties showed that both YkuN and YkuP were typical short-chain flavodoxins (158 and 151 amino acids, respectively) and that an error in ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi049131t
更新日期:2004-10-05 00:00:00
abstract::Tombusviruses use a 19 kDa protein (p19) as a suppressor of the RNA silencing pathway during infection. The p19 protein binds to short-interfering RNA (siRNA) as a dimer and shows a high selectivity for short duplex RNAs over other RNA species. Since p19 can bind to synthetic and RNA silencing generated small RNAs wit...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi800401y
更新日期:2008-08-05 00:00:00
abstract::Structural features of a 19-nucleotide RNA hairpin loop (5'-GGCGUACGUUUCGUACGCC-3'), a loop motif which occurs in eukaryotic 18S rRNA, have been derived using multidimensional heteronuclear NMR spectroscopy in combination with local conformational analysis and torsion angle distance geometry followed by restrained ene...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi971207g
更新日期:1997-11-18 00:00:00
abstract::Class II MHC glycoproteins bind short (7-25 amino acid) peptides in an extended type II polyproline-like conformation and present them for immune recognition. Because empty MHC is unstable, measurement of the rate of the second-order reaction between peptide and MHC is challenging. In this report, we use dissociation ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9921337
更新日期:2000-02-08 00:00:00
abstract::Coenzyme A (CoASH) is the major low-molecular weight thiol in Staphylococcus aureus and a number of other bacteria; the crystal structure of the S. aureus coenzyme A-disulfide reductase (CoADR), which maintains the reduced intracellular state of CoASH, has recently been reported [Mallett, T.C., Wallen, J.R., Karplus, ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi062299p
更新日期:2007-03-20 00:00:00
abstract::The equilibrium unfolding reaction of Ltn, a metamorphic C-class chemokine, was monitored by tryptophan fluorescence to determine unfolding free energies. Measurements revealed that addition of 150 mM NaCl stabilized the Ltn chemokine fold by approximately 1 kcal/mol. Specific mutations involving Arg23 and Arg43 also ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi300842j
更新日期:2012-11-13 00:00:00
abstract::The covalent modification of chicken liver fatty acid synthase by 4-(1-pyrenyl)butyryl-CoA (PBA-CoA), a fluorescent analogue of acetyl- and malonyl-CoA, has been studied. The binding isotherms and the kinetics of inactivation suggest 2 mol of PBA-CoA/mol of enzyme is specifically incorporated into the enzyme. Two clas...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00281a032
更新日期:1983-06-07 00:00:00
abstract::Distinct structural features of DNA, such as the curvature of dA tracts, are important in the recognition, packaging, and regulation of DNA. Physiologically relevant concentrations of magnesium have been found to enhance the curvature of dA tract DNAs, as monitored by solution-state NMR, indicating that the structure ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi010853j
更新日期:2001-08-07 00:00:00