Abstract:
:The malaria parasite pigment, hemozoin, is a crystal of ferriprotoporphyrin IX (FP-Fe(III)), a product of hemoglobin digestion. Hemozoin formation is essential for FP-Fe(III) detoxification in the parasite; it is the main target of quinoline antimalarials and can modulate immune and inflammation responses. To gain further insight into the likely mechanisms of crystal formation and hemozoin reactivity, we have reanalyzed the crystal structure data for beta-hematin and solved the crystal structure of Plasmodium falciparum hemozoin. The analysis reveals that the structures are very similar and highlights two previously unexplored modes of FP-Fe(III) self-association involving pi-pi interactions that may initiate crystal formation and help to stabilize the extended structure. Hemozoin can be considered to be a crystal composed of pi-pi dimers stabilized by iron-carboxylate linkages. As a result, it is predicted that two surfaces of the crystal would consist of pi-pi dimers with Fe(III) partly exposed to solvent and capable of undergoing redox reactions. Accordingly, we demonstrate that the crystal possesses both general peroxidase activity and the ability to cause lipid oxidation.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Klonis N,Dilanian R,Hanssen E,Darmanin C,Streltsov V,Deed S,Quiney H,Tilley Ldoi
10.1021/bi100567jsubject
Has Abstractpub_date
2010-08-10 00:00:00pages
6804-11issue
31eissn
0006-2960issn
1520-4995journal_volume
49pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::The direct interrogation of fleeting intermediates by rapid-mixing kinetic methods has significantly advanced our understanding of enzymes that utilize dioxygen. The gas's modest aqueous solubility (<2 mM at 1 atm) presents a technical challenge to this approach, because it limits the rate of formation and extent of a...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi201906x
更新日期:2012-02-28 00:00:00
abstract::Pump-1 cDNA has recently been isolated by screening a human tumor cDNA library with a transin (rat stromelysin) probe under low-stringency hybridization conditions. The cDNA codes for a potential protein with significant sequence similarity to the metalloproteinases collagenase and stromelysin, but which lacks the hem...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00439a004
更新日期:1989-06-27 00:00:00
abstract::Furanacryloyl-Phe-Gly-Gly has been shown to be a convenient substrate for angiotensin converting enzyme (dipeptidyl carboxypeptidase, EC 3.4.15.1). A detailed kinetic analysis of the hydrolysis of this substrate indicates normal Michaelis-Menten behavior with kcat = 19000 min-1 and KM = 3.0 x 10(-4) M determined at pH...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00270a015
更新日期:1983-01-04 00:00:00
abstract::In the accompanying paper [Suzuki, A., Yamazaki, M., & Ito, T. (1996) Biochemistry 35, 5238-5244], we presented a quantitative phase diagram of actin filament ( (F-actin) described with the F-actin concentration and delta chi value which characterizes the affinity of F-actin with solvent. The phase diagram shows that ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9526948
更新日期:1996-04-23 00:00:00
abstract::The amino acid sequence of chick skin collagen alpha1-CB7, the 268 CNBr peptide from the helical portion of the alpha1 chain, has been determined by automatic and manual degradation of tryptic and chymotryptic peptides, and of the COOH-terminal fragment produced by cleavage with animal collagenase. The resulting seque...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00684a013
更新日期:1975-07-01 00:00:00
abstract::The heme binding sites of rabbit histidine-rich glycoprotein (HRG), 94 kDa, were studied with rose bengal (RB), a fluorescein derivative that associates with histidine residues. Difference absorbance spectra indicate that HRG binds RB at two thermodynamically preferred sites (Kd approximately 2 microM) that are spectr...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00342a034
更新日期:1985-10-08 00:00:00
abstract::X-ray structural information provides the opportunity to explore quantitatively the relation between the microenvironments of heme proteins and their redox potentials. This can be done by considering the protein as a "solvent" for its redox center and calculating the difference between the electrostatic energy of the ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00355a035
更新日期:1986-04-08 00:00:00
abstract::During cellular uptake of fluorescently labeled cell-penetrating peptides (CPPs), intense fluorescent signals are commonly observed in the nucleus of the cell, suggesting intracellular CPP relocation and potential binding to the genome of the host. We therefore investigated the interaction of the CPP HIV-1 Tat(47-57) ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi700416h
更新日期:2007-07-10 00:00:00
abstract::The X-ray crystal structure of human soluble epoxide hydrolase (sEH) has been determined at 2.6 A resolution, revealing a domain-swapped quaternary structure identical to that observed for the murine enzyme [Argiriadi, M. A., Morisseau, C., Hammock, B. D., and Christianson, D. W. (1999) Proc. Natl. Acad. Sci. U.S.A. 9...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi036189j
更新日期:2004-04-27 00:00:00
abstract::MeCP2 has been identified as a chromatin-associated protein that recognizes MAR elements as well as methyl-CpGs. To characterize target sequences of MeCP2 in human cells, we employed two complementary methods. First, by use of a preparative chromatin immunoprecipitation protocol, we created from MCF7 cells a library e...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0359271
更新日期:2004-05-04 00:00:00
abstract::Tetrachlorohydroquinone dehalogenase catalyzes the replacement of chlorine atoms on tetrachlorohydroquinone and trichlorohydroquinone with hydrogen atoms during the biodegradation of pentachlorophenol by Sphingomonas chlorophenolica. The sequence of the active site region of tetrachlorohydroquinone dehalogenase is ver...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9923813
更新日期:2000-05-09 00:00:00
abstract::A faithful transcription system for ribosomal RNA genes has been developed by using components from the small free-living amoeba Acanthamoeba castellanii. The system utilizes protein-free recombinant DNA as a template and in addition requires a crude cell-free extract containing RNA polymerase I and a transcription in...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00313a025
更新日期:1984-08-28 00:00:00
abstract::The rate of deuterium exchange of a purine 8CH group in DNA is highly sensitive to both macromolecular secondary structure and intermolecular interactions which restrict solvent access to the major groove [Lamba, O.P., Becka, R., & Thomas, G.J., Jr. (1990) Biopolymers 29, 1465-1477]. We have exploited the sensitivity ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00127a012
更新日期:1992-03-31 00:00:00
abstract::Nonsense mutations that result in premature stop codons in the HBB gene cause β-thalassemia. This disease is characterized by a reduced hemoglobin level due to the lack of β-globin. Compounds that induce translational readthrough across the thalassemia-causing premature stop codon will have therapeutic benefits. Curre...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00761
更新日期:2020-01-14 00:00:00
abstract::The qualitative and quantitative features of mutagenesis by two DNA adducts of carcinogenic alkylating agents, O6-methylguanine (m6G) and O4-methylthymine (m4T), were examined in vivo. The deoxyhexanucleotides 5'-GCTAGC-3' and 5'-GCTAGC-3' were synthesized, where the underlined bases are the positions of m4T or m6G, r...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00242a031
更新日期:1991-07-16 00:00:00
abstract::The class D β-lactamase OXA-143 has been described as an efficient penicillinase, oxacillinase, and carbapenemase. The D224A variant, known as OXA-231, was described in 2012 as exhibiting less activity toward imipenem and increased oxacillinase activity. Additionally, the P227S mutation was reported as a case of conve...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00365
更新日期:2019-08-27 00:00:00
abstract::Thiol dioxygenases are mononuclear non-heme FeII-dependent metalloenzymes that initiate the oxidative catabolism of thiol-containing substrates to their respective sulfinates. Cysteine dioxygenase (CDO), the best characterized mammalian thiol dioxygenase, contains a three-histidine (3-His) coordination environment rat...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.0c00267
更新日期:2020-07-07 00:00:00
abstract::Only beta-beta cross-links form when the alpha(3)(betaE(395)C)(3)gammaK(36)C (MF(1) residue numbers) double mutant subcomplex of TF(1), the F(1)-ATPase from the thermophilic Bacillus PS3, is slowly inactivated with CuCl(2) in the presence or absence of MgATP. The same slow rate of inactivation and extent of beta-beta ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi036058i
更新日期:2004-03-09 00:00:00
abstract::PsbO, the photosystem II manganese stabilizing protein, contains an aspartate residue [Asp157 (spinach numbering)], which is highly conserved in eukaryotic and prokaryotic PsbOs. The homology model of the PSII-bound conformation of spinach PsbO presented here positions Asp157 in the large flexible loop of the protein....
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9016999
更新日期:2009-12-22 00:00:00
abstract::In prokaryotes, the first three enzymes in pyrimidine biosynthesis, carbamoyl phosphate synthetase (CPS), aspartate transcarbamoylase (ATC), and dihydroorotase (DHO), are commonly expressed separately and either function independently (Escherichia coli) or associate into multifunctional complexes (Aquifex aeolicus). I...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi801831r
更新日期:2009-02-03 00:00:00
abstract::The enzyme hydrogenase, from the photosynthetic bacterium Chromatium, was purified to homogeneity after solubilization of the particulate enzyme with deoxycholate. The purification procedure included ammonium sulfate fractionation, treatment with manganous phosphate gel, heating at 63 degrees, DEAE-cellulose chromatog...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00683a001
更新日期:1975-06-17 00:00:00
abstract::P-450(15)alpha is a form of cytochrome P-450 purified from liver microsomes of female 129/J mice that is specific for oxidation of testosterone to its 15 alpha-hydroxylated product. Testosterone 15 alpha-hydroxylase activity that was inhibited by anti-P-450(15)alpha antibody was approximately 50 times higher in renal ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00365a028
更新日期:1986-08-26 00:00:00
abstract::A human cDNA, UDPGTh-3, encoding a dihydrotestosterone/5 alpha-androstane-3 alpha,17 beta-diol UDP- glucuronosyltransferase (transferase) has been isolated and characterized. The nucleotide sequence of UDPGTh-3 encodes a 530 amino acid protein with a typical membrane insertion-signal peptide, a membrane-anchoring doma...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00091a015
更新日期:1993-10-12 00:00:00
abstract::A new rapid procedure for purifying 10-formyltetrahydrofolate dehydrogenase results in 90 mg of pure enzyme from two rabbit livers. This abundant liver enzyme is known to bind its product tetrahydropteroylpentaglutamate (H4PteGlu5) so tightly that it does not dissociate during size exclusion chromatography. 10-Formylt...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9619684
更新日期:1996-12-10 00:00:00
abstract::The binding of Zn2+ to tubulin and the ability of this cation to promote the polymorphic assembly of the protein were examined. Equilibrium binding showed the existence of more than 60 potential Zn2+ binding sites on the dimer, including a number of high-affinity sites. The number of high-affinity sites, estimated by ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00270a032
更新日期:1983-01-04 00:00:00
abstract::The flavocytochrome p-cresol methylhydroxylase from Pseudomonas putida has been reported to have a Mr of 114,000 and to consist of two subunits, a flavoprotein and a cytochrome c, each with a Mr of 58,000. Recent X-ray crystallographic data from our laboratories [Shamala, N., Lim, L. W., Mathews, F. S., McIntire, W., ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00368a021
更新日期:1986-10-07 00:00:00
abstract::Transient contacts between denatured polypeptide chains are likely to play an important part in the initial stages of protein aggregation and fibrillation. To analyze the nature of such contacts, we have carried out a protein engineering study of the 102-residue protein U1A, which aggregates transiently in the wild-ty...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi048509k
更新日期:2004-10-19 00:00:00
abstract::The level of albumin mRNA in the normal Buffalo rat liver and Morris hepatoma 7777 was compared by molecular hybridization with albumin complementary DNA (cDNA) and translational assays. Albumin mRNA was found to be 10% of the total rat liver poly(A)-containing RNA population but reduced approximately fourfold in the ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00608a028
更新日期:1978-07-25 00:00:00
abstract::7-Ketocholesterol is an oxidized derivative of cholesterol with numerous physiological effects. In model membranes, 7-ketocholesterol and cholesterol were compared by physical measures of bilayer order and polarity, formation of detergent resistant domains (DRM), phase separation, and membrane microsolubilization by a...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0506425
更新日期:2005-08-02 00:00:00
abstract::Comparative studies on the salt titration and the related kinetics for poly(dG-dC) X poly(dG-dC) in pH 7.0 and 3.8 solutions clearly suggest that base protonation facilitates the kinetics of B-Z interconversion although the midpoint for such a transition in acidic solution (2.0-2.1 M NaCl) is only slightly lower than ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00320a041
更新日期:1984-12-04 00:00:00