Abstract:
:Human hemoglobin produced in the Escherichia coli coexpression system of Hernan et al. [(1992) Biochemistry 31, 8619-8628] has been transformed into a functionally homogeneous protein whose properties closely approximate those of normal hemoglobin A. Both of the alpha and beta chains of this hemoglobin contain a valine-methionine substitution at position 1 in order to accommodate the difference in specificity of the protein-processing enzymes of procaryotes. Despite extensive purification, functional homogeneity of the E. coli expressed hemoglobin was achieved only by the complete disassembly of the hemoglobin into its component alpha and beta globins and their reassembly in the presence of hemin. The kinetics of CO combination and the thermodynamics of O2 binding and cooperativity of the reassembled alphaV1M-betaV1M hemoglobin closely approximate those of HbA. The alpha globin obtained from the E. coli expressed hemoglobin was also combined with normal human beta chains and hemin to form the alphaV1M variant. The alpha+M variant of HbA, in which the normal N-terminal valine of the alpha chains is preceded by a methionine residue, was prepared by the same procedure. The kinetics of the reactions of CO with the alphaV1M and alpha+M variants are similar to those for HbA. The equilibria of oxygen binding to alphaV1M and HbA are similar whereas alpha+M exhibits a significantly higher oxygen affinity. The three-dimensional structures of alphaV1M and alpha+M offer an explanation for the latter affinity difference. Although the structures of alphaV1M and HbA, which have been determined by X-ray crystallography, are virtually indistinguishable except at the N-terminal residues, that of alpha+M indicates the displacement of a solvent molecule, possibly a chloride ion, from arginine 141alpha. Such an alteration in an anion binding site could result in increased oxygen affinity.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Hui HL,Kavanaugh JS,Doyle ML,Wierzba A,Rogers PH,Arnone A,Holt JM,Ackers GK,Noble RWdoi
10.1021/bi981986gsubject
Has Abstractpub_date
1999-01-19 00:00:00pages
1040-9issue
3eissn
0006-2960issn
1520-4995pii
bi981986gjournal_volume
38pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::The reaction of mushroom (Agaricus bisporus) tyrosinase with dioxygen in the presence of several o-diphenolic substrates has been studied by steady-state and transient-phase kinetics in order to elucidate the rate-limiting step and to provide new insights into the mechanism of oxidation of these substrates. A kinetic ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi000539+
更新日期:2000-08-29 00:00:00
abstract::The vast majority of characterized oxygenases use bound cofactors to activate molecular oxygen to carry out oxidation chemistry. Here, we show that an enzyme of unknown activity, RhCC from Rhodococcus jostii RHA1, functions as an oxygenase, using 4-hydroxyphenylenolpyruvate as a substrate. This unique and complex reac...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi501200j
更新日期:2015-02-10 00:00:00
abstract::RPE65, a protein expressed in cells of the retinal pigment epithelium of the eye, is essential for the synthesis by isomerohydrolase of 11-cis-retinal, the chromophore of rod and cone opsins. Recent work has established that RPE65 is a retinyl ester binding protein, and as all-trans-retinyl esters are the substrate fo...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0505363
更新日期:2005-07-26 00:00:00
abstract::The catalytic and structural properties of divalent metal ion cofactor binding sites in the dapE-encoded N-succinyl-L,L-diaminopimelic acid desuccinylase (DapE) from Haemophilus influenzae were investigated. Co(II)-substituted DapE enzyme was 25% more active than the Zn(II)-loaded form of the enzyme. Interestingly, Mn...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi034845+
更新日期:2003-09-16 00:00:00
abstract::Kinetic analysis and modeling studies of HIV-1 and HIV-2 proteinases were carried out using the oligopeptide substrate [formula: see text] and its analogs containing single amino acid substitutions in P3-P3' positions. The two proteinases acted similarly on the substrates except those having certain hydrophobic amino ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00135a008
更新日期:1992-05-26 00:00:00
abstract::We have measured the concentration of mRNAs coding for immunoglobulins, k and lambda type light chains and gamma 1 type heavy chain, in mouse spleen cells activated by bacterial lipopolysaccharide or sheep red blood cells. These mRNAs were quantitated by hybridization to radioactive DNA complementary to highly purifie...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00645a018
更新日期:1977-12-27 00:00:00
abstract::The pivotal role of the Arg-Gly-Asp (RGD) peptide motif in integrin-mediated cell adhesive interactions with extracellular matrix and plasma proteins stimulated the present design of nonpeptidic mimetics of this sequence. To probe the structural requirements for RGD recognition by integrins, we designed various struct...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00055a002
更新日期:1993-02-02 00:00:00
abstract::Structure-function studies of antibody-antigen systems include the identification of amino acid residues in the antigen that interact with an antibody and elucidation of their individual contributions to binding affinity. We used fluorescence correlation spectroscopy (FCS) and alanine-scanning mutagenesis to character...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0607047
更新日期:2006-11-28 00:00:00
abstract::The membrane-proximal external region (MPER) of the gp41 fusion protein of HIV is highly conserved among isolates of this virus and is considered a target for vaccine development. This region also appears to play a role in membrane fusion as well as localization of the virus to cholesterol-rich domains in membranes. T...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi8014828
更新日期:2008-11-11 00:00:00
abstract::βγ-Crystallins are important constituents of the vertebrate eye lens, whereas in microbes, they are prevalent as Ca2+-binding proteins. In archaea, βγ-crystallins are conspicuously confined to two methanogens, viz., Methanosaeta and Methanosarcina. One of these, i.e., M-crystallin from Methanosarcina acetivorans, has ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.6b00985
更新日期:2017-03-07 00:00:00
abstract::The diffusion of protons at the immediate vicinity of (less than 10 A from) a phospholipid membrane is studied by the application of the laser-induced proton pulse. A light-sensitive proton emitter (8-hydroxypyrene-1,3,6-trisulfonate) was trapped exclusively in the hydration layers of multilamellar vesicles made of eg...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00433a029
更新日期:1989-04-04 00:00:00
abstract::Binding of deoxyribonucleoside 5'-triphosphates to DNA polymerase I of Escherichia coli was measured by using a microscale nonequilibrium dialysis method. It allowed rapid and economic measurement of dissociation constants, with negligible interfering side reactions. A stoichiometry of 1 mol of nucleoside 5'-triphosph...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00335a033
更新日期:1985-07-02 00:00:00
abstract::Cytochrome c6 from Monoraphidium braunii, an 89-amino acid electron transfer protein, has been investigated by NMR in solution, in its oxidized form, at pH 7 and 300 K. By using a combination of COSY, TOCSY, and NOESY experiments, 84% of the proton resonances have been assigned. A total of 1668 experimental NOE constr...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi972765y
更新日期:1998-04-07 00:00:00
abstract::Numerous zinc ectoenzymes are folded and activated in the compartments of the early secretory pathway, such as the ER and the Golgi apparatus, before reaching their final destination. During this process, zinc must be incorporated into the active site; therefore, metalation of the nascent protein is indispensable for ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00924
更新日期:2020-01-14 00:00:00
abstract::The mechanisms of interaction of the recombinant N-terminal portion of bactericidal/permeability-increasing protein, rBPI21, with various planar asymmetric and symmetric bilayer membranes, including the lipid matrix of the outer membrane of Gram-negative bacteria, were investigated via electrical measurements. For the...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi970177e
更新日期:1997-08-19 00:00:00
abstract::In Bacillus subtilis, P protein is the noncatalytic component of ribonuclease P (RNase P) that is critical for achieving maximal nuclease activity under physiological conditions. P protein is predominantly unfolded (D) at neutral pH and low ionic strength; however, it folds upon the addition of sulfate anions (ligands...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0504613
更新日期:2005-10-04 00:00:00
abstract::A combined experimental and theoretical investigation of the deuterium isotope effects on the bacterial luciferase reaction is described. The experimental studies focus on determining if the unusual aldehydic deuterium isotope effect of approximately 1.5 observed in these reactions is an intrinsic isotope effect resul...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi972266x
更新日期:1998-02-24 00:00:00
abstract::Deazaflavins have been found to act as potent catalysts in the photoreduction of flavoproteins in the presence of EDTA and other "photosubstrates". In distinction to the catalysis brought about by normal flavins which involves dark reaction of the photoreduced flavin catalyst, the mechanism of the catalysis by deazafl...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00594a002
更新日期:1978-01-10 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::Tissue factor pathway inhibitor (TFPI) from different cell lines shows up to 15-fold differences in the ratio of anticoagulant to chromogenic activity. The anticoagulant activity was dependent on the purification procedure used and it was possible to isolate two fractions of recombinant TFPI. Only one of these fractio...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00107a002
更新日期:1991-10-29 00:00:00
abstract::In eukaryotic cells, chromatin is classified into euchromatin, which is active in transcription, and heterochromatin that silences transcription. Histones in these two domains contain distinct modifications. Chromatin assembly factor 1 (CAF-1) is a highly conserved protein that functions in DNA replication, DNA repair...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0521083
更新日期:2006-03-07 00:00:00
abstract::Our previous studies revealed that interaction of fibrin with the very low density lipoprotein (VLDL) receptor plays a prominent role in transendothelial migration of leukocytes and thereby inflammation. The major goal of our subsequent studies is to establish the structural basis for this interaction. As the first st...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.8b00349
更新日期:2018-07-31 00:00:00
abstract::Escherichia coli, Clostridium sticklandii, and Methanococcus vannielii synthesize 75Se-labeled amino acid transfer ribonucleic acids [( 75Se]tRNAs) when grown with low levels (approximately equal to 1 microM) of 75SeO32-. When E. coli [75Se]tRNA was digested to nucleosides and analyzed by reversed-phase high-performan...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00315a021
更新日期:1984-09-25 00:00:00
abstract::The lateral stalk of ribosomes constitutes the GTPase-associated center and is responsible for recruiting translation factors to the ribosomes. The eukaryotic stalk contains a P-complex, in which one molecule of uL10 (formerly known as P0) protein binds two copies of P1/P2 heterodimers. Unlike bacterial uL10, eukaryot...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00528
更新日期:2019-09-10 00:00:00
abstract::Modification of the bacterial cell wall heteropolymer peptidoglycan by addition of an acetyl group to the C-6 hydroxyl group of N-acetylmuramoyl residues is known to inhibit the activity of muramidases (lysozymes) of innate immune systems. The O-acetylation of peptidoglycan also precludes the action of intrinsic lytic...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi051679s
更新日期:2006-01-24 00:00:00
abstract::Here, we biochemically characterize Dictyostelium myosin II mutants that were previously phenotypically selected following random mutagenesis and shown to lie in the actin binding domain [Patterson, B., & Spudich, J. A. (1996) Genetics 143, 801-810]. We show that the conditional loss of myosin-dependent activity in vi...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi963141f
更新日期:1997-07-15 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::Epigallocatechin-3-gallate (EGCG) is a catechin found in green tea that can inhibit the amyloid formation of a wide variety of proteins. EGCG's ability to prevent or redirect the amyloid formation of so many proteins may reflect a common mechanism of action, and thus, greater molecular-level insight into how it exerts...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.0c00043
更新日期:2020-03-17 00:00:00
abstract::The purified ATP-synthesizing complex from chloroplasts has been reconstituted into phospholipid vesicles with bacteriorhodopsin by use of octyl glucoside. Phosphorylation rates up to 90 mmol of ATP (mg of protein)-1 min-1 have been achieved. The dependence of the steady-state kinetic parameters on external and intern...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00527a018
更新日期:1981-11-24 00:00:00
abstract::To probe attitudinal features of the Ca(2+)-deficient site (site I) in the Ca2+ switch of cardiac troponin C (cTnC), we have examined steady-state fluorescence emission and polarization of a Trp26 inserted in a recombinant cardiac TnC (cTnC3.W) and compared these with the properties of the Ca(2+)-competent site I in s...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00002a022
更新日期:1995-01-17 00:00:00