Abstract:
:The cyanobacterium Synechocystis sp. PCC 6803 (S6803) expresses a two-on-two globin in which His46 (distal side) and His70 (proximal) function as heme iron axial ligands. His46 can be displaced by O2, CO, and CN-, among others, whereas His70 is not labile under native conditions. The residue preceding the proximal histidine has been implicated in controlling globin axial ligand reactivity; the details of the mechanism, however, are not well understood, and little information exists for bis-histidyl hexacoordinate proteins. In many vertebrate hemoglobins and in the Synechocystis protein, the position is occupied by an alanine, whereas, in myoglobins, it is a serine involved in an intricate hydrogen-bond network. We examined the role of Ala69 in S6803 hemoglobin through the effects of an Ala --> Ser replacement. The substitution resulted in minor structural perturbations, but the response of the holoprotein to temperature-, urea-, and acid-induced denaturation was measurably affected. Enhanced three-state behavior was manifested in the decoupling of heme binding and secondary-structure formation. Urea-gradient gel experiments revealed that the stability of the apoprotein was unchanged by the replacement and that a slight alteration of the folding kinetics occurred in the holoproteins. Cyanide-binding experiments were performed to assess trans effects. The apparent rate constant for association decreased 2-fold upon Ala69Ser replacement. This deceleration was attributed to a change in the lifetime of a state containing a decoordinated His46. The results demonstrated that, as in vertebrate globins and leghemoglobin, proximal influences operate to determine fundamental dynamic and thermodynamic properties of the protein.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Knappenberger JA,Kuriakose SA,Vu BC,Nothnagel HJ,Vuletich DA,Lecomte JTdoi
10.1021/bi060691xsubject
Has Abstractpub_date
2006-09-26 00:00:00pages
11401-13issue
38eissn
0006-2960issn
1520-4995journal_volume
45pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::Photochemical and subsequent thermal reactions of rhodopsin containing 9-cis-retinal [Rh(9)] or one of four analogues with 9-cis geometries formed from ring-modified retinals, alpha-retinal [alpha Rh(9)], acyclic retinal [AcRh(9)], acyclic alpha-retinal [Ac alpha Rh(9)], and 5-isopropyl-alpha-retinal [P alpha Rh(9)] w...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00233a022
更新日期:1991-05-14 00:00:00
abstract::This paper presents the crystal structure of porcine pancreatic carboxypeptidase B (pp-CpB) in complex with a variety of thiol-based inhibitors that were developed as antagonists of activated thrombin-activatable fibrinolysis inhibitor (TAFIa). Recent studies have indicated that a selective inhibitor of TAFIa could en...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0501941
更新日期:2005-07-05 00:00:00
abstract::Overall activation volumes for multistep reactions are not usually pressure independent. The present investigation gives a quantitative description of this effect under Theory. Simple relations are obtained which can easily be applied to experimental data and which allow more insight into the dynamics of enzyme reacti...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00405a024
更新日期:1988-03-08 00:00:00
abstract::The tyrosine kinase c-Abl is implicated in a variety of cellular processes that are tightly regulated by c-Abl kinase activity and/or by interactions between c-Abl and other signaling molecules. The interaction of c-Abl with the Abl interactor protein Abi2 is shown to be negatively regulated by phosphorylation of seri...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi701533j
更新日期:2008-01-22 00:00:00
abstract::The structures at 2.0 and 2.25 A resolution of native and recombinant nitrite reductase from Alcaligenes faecalis show that they are identical to each other and very similar to nitrite reductase from Achromobacter cycloclastes. The crystallographic structure of a mutant, M150E, which unlike the wild-type protein canno...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00038a003
更新日期:1995-09-26 00:00:00
abstract::The carbon-13 (13C) nuclear magnetic resonance (NMR) behavior of the hyperactive analogue of luteinizing-hormone-releasing hormone (LH-RH), des-Gly-NH2(10)-[D-Leu6]LH-RH ethylamide, has been studied. The spectra are compared with those of the hypoactive des-Gly-NH2(10)-[L-Leu6]LH-RH ethylamide. Spin-lattice relaxation...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00666a020
更新日期:1976-10-19 00:00:00
abstract::S100 proteins are small dimeric members of the EF-hand superfamily of Ca(2+) binding proteins thought to participate in mediating intracellular Ca(2+) signals by binding to and thereby regulating target proteins in a Ca(2+)-dependent manner. As dimer formation is crucial to S100 function, we applied a yeast two-hybrid...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi000257+
更新日期:2000-08-08 00:00:00
abstract::The bacterial second messenger signaling molecule bis-(3'-5')-cyclic dimeric guanosine monophosphate (c-di-GMP) controls important biological processes such as biofilm formation, virulence response, and motility. This second messenger is sensed by macromolecular targets inside the cell, both protein and RNA, which ind...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi301510v
更新日期:2013-01-15 00:00:00
abstract::Photosynthetic water oxidation takes place at the Mn4CaO5 cluster in photosystem II. Around the Mn4CaO5 cluster, a hydrogen bond network is formed by several water molecules, including four water ligands. To clarify the role of this water network in the mechanism of water oxidation, we investigated the effects of the ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.5b01120
更新日期:2016-01-26 00:00:00
abstract::Galactose oxidase is a remarkable enzyme containing a metalloradical redox cofactor capable of oxidizing a variety of primary alcohols during enzyme turnover. Recent studies using 1-O-methyl alpha-D-galactopyranoside have revealed an unusually large kinetic isotope effect (KIE) for oxidation of the alpha-deuterated al...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi010303l
更新日期:2001-06-19 00:00:00
abstract::The ligation state of hemoglobin during its cross-linking by glycolaldehyde influences the ultimate oxygen affinity of the cross-linked protein. Thus, if the cross-linking is performed with carbonmonoxy-hemoglobin, the oxygen affinity increases slightly to a P50 of 7 mmHg from a P50 of 9 mmHg for unmodified hemoglobin...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00417a064
更新日期:1988-08-23 00:00:00
abstract::Pyrophosphate-dependent 6-phosphofructo-1-kinase (PPi-PFK) from Propionibacterium freudenreichii was inactivated by low concentrations of the lysine-specific reagent pyridoxal phosphate (PLP) after sodium borohydride reduction. The substrates fructose 6-phosphate and fructose 1,6-bisphosphate protected against inactiv...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00135a011
更新日期:1992-05-26 00:00:00
abstract::1H NMR spectroscopy of the isotropically shifted signals in cobalt carboxypeptidase, CoCPD, permits a direct and selective detection of protons belonging to the residues liganded to the metal. The chemical shift of these protons in the free enzyme and enzyme-inhibitor complexes with changing pH monitors the state of i...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00130a015
更新日期:1992-04-21 00:00:00
abstract::Fatty acid-induced upregulation of death receptor 5 (DR5) and its cognate ligand, tumor necrosis factor-related apoptosis-inducing ligand (TRAIL), promotes hepatocyte lipoapoptosis, which is a key mechanism in the progression of fatty liver disease. Accordingly, inhibition of DR5 signaling represents an attractive str...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.0c00529
更新日期:2020-10-13 00:00:00
abstract::The photochemical and subsequent thermal reactions of the mouse short-wavelength visual pigment (MUV) were studied by using cryogenic UV-visible and FTIR difference spectroscopy. Upon illumination at 75 K, MUV forms a batho intermediate (lambda(max) approximately 380 nm). The batho intermediate thermally decays to the...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi025883g
更新日期:2002-08-06 00:00:00
abstract::We investigated the molecular mechanisms and the binding site location for the fluorophor crystal violet (CrV), a noncompetitive antagonist of the nicotinic acetylcholine receptor (AChR). To this end, radiolabeled competition binding, fluorescence spectroscopy, Schild-type analysis, patch-clamp recordings, and molecul...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi051752e
更新日期:2006-02-21 00:00:00
abstract::Dendritic cell-specific intracellular adhesion molecule-3-grabbing nonintegrin (DC-SIGN) is a C-type lectin highly expressed on the surface of antigen-presenting dendritic cells. DC-SIGN mediates interactions among dendritic cells, pathogens, and a variety of epithelia, myeloid cells, and endothelia by binding to high...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi5005014
更新日期:2014-09-09 00:00:00
abstract::αB-Crystallin is a chaperone and an anti-apoptotic protein that is strongly expressed in many tissues, including the lens, retina, heart, and kidney. In the human lens, several lysine residues in αB-crystallin are acetylated. We have previously shown that such acetylation is predominant at lysine 92 (K92) and lysine 1...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi400638s
更新日期:2013-11-12 00:00:00
abstract::To identify how many rhodopsin intermediates interact with retinal G-protein transducin, the photobleaching process of chicken rhodopsin has been investigated in the presence or absence of transducin by means of time-resolved low-temperature spectroscopy. Singular value decomposition (SVD) analysis of the spectral dat...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi970932o
更新日期:1997-11-18 00:00:00
abstract::A Ca(2+)-activated thiol protease was purified from Drosophila melanogaster. The procedure involves Phenyl-Sepharose, Reactive Red-Agarose and Q-Sepharose fast flow (or MonoQ) chromatographic steps. The enzyme eluting from Q-Sepharose fast flow seems to be homogeneous as judged by silver staining on SDS-PAGE: it consi...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00150a012
更新日期:1992-09-08 00:00:00
abstract::A conformational analysis of the valine side chains of ribonuclease T1 (RNase T1) was performed using NMR spectroscopy, in particular homonuclear (1H, 1H and 13C, 13C) and heteronuclear (1H, 15N and 1H, 13C) vicinal spin-spin coupling constants as obtained from E.COSY-type NMR experiments. The coupling constants relat...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00184a017
更新日期:1994-05-10 00:00:00
abstract::Escherichia coli cAMP receptor protein (CRP) controls more than 20 genes. There are significant differences in the promoter regions in these genes. Thus, an elucidation of the mechanism of CRP action requires knowledge about the mode of selectivity in these promoters. An earlier study [Heyduk, T., & Lee, J. C. (1990) ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi952187q
更新日期:1996-01-30 00:00:00
abstract::We have examined the ability of the Escherichia coli single-stranded DNA binding protein (SSB) tetramer to form its different binding modes on poly(dC), poly(U), and poly(A) over a range of NaCl and NaF concentrations for comparison with previous studies with poly(dT). In reverse titrations with poly(U) and poly(A) at...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00186a016
更新日期:1994-05-24 00:00:00
abstract::G protein-coupled receptor (GPCR) kinases (GRKs) instigate the desensitization of activated GPCRs via phosphorylation that promotes interaction with arrestins, thereby preventing the interaction of GPCRs with heterotrimeric G proteins. A current proposed model of GRK1 activation involves the binding of activated rhodo...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi300295y
更新日期:2012-04-24 00:00:00
abstract::To better understand how amino acid sequences specify unique tertiary folds, we have used random mutagenesis and phage display selection to evolve proteins with a high degree of sequence identity but different tertiary structures (homologous heteromorphs). The starting proteins in this evolutionary process were the Ig...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi051231r
更新日期:2005-11-01 00:00:00
abstract::In cells, RNAs likely adopt numerous intermediate conformations prior to formation of functional RNA-protein complexes. We used single-nucleotide resolution selective 2'-hydroxyl acylation analyzed by primer extension (SHAPE) to probe the structure of Escherichia coli 16S rRNA in healthy growing bacteria. SHAPE-direct...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi500198b
更新日期:2014-05-20 00:00:00
abstract::The acid-induced arginine decarboxylase is part of an enzymatic system in Escherichia coli that contributes to making this organism acid resistant. The arginine decarboxylase is a vitamin B(6)-dependent enzyme that is active at acidic pH. It consumes a proton in the decarboxylation of arginine to agmatine, and by work...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi900075d
更新日期:2009-05-12 00:00:00
abstract::The Na(+)-pumping NADH:quinone oxidoreductase (Na(+)-NQR) is a fundamental enzyme of the oxidative phosphorylation metabolism and ionic homeostasis in several pathogenic and marine bacteria. To understand the mechanism that couples electron transfer with sodium translocation in Na(+)-NQR, the ion dependence of the red...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi300343u
更新日期:2012-05-15 00:00:00
abstract::The interaction of lipoprotein lipase (LpL) and a nonhydrolyzable phosphatidylcholine, 1,2-ditetradecyl-rac-glycero-3-phosphocholine (C14-ether-PC), has been studied by several physical methods. Analysis of the circular dichroic spectrum of LpL gave the following fractional conformation: 35% alpha-helix, 30% beta-plea...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00352a020
更新日期:1986-02-25 00:00:00
abstract::Hydrolysis of monodisperse short chain phosphatidylcholines, far below their critical micelle concentration, by phospholipase A2 (PLA2) and other interfacial enzymes is characterized. Results show that virtually all the observed hydrolysis by pancreatic and human inflammatory PLA2 occurs on surfaces of the reaction ve...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi990194z
更新日期:1999-08-10 00:00:00