Abstract:
:Two dioxygenases (ARD and ARD') were cloned from Klebsiella pneumoniae that catalyze different oxidative decomposition reactions of an advanced aci-reductone intermediate, CH(3)SCH(2)CH(2)COCH(OH)=CH(OH) (I), in the methionine salvage pathway. The two enzymes are remarkable in that they have the same polypeptide sequence but bind different metal ions (Ni(2+) and Fe(2+), respectively). ARD converts I to CH(3)SCH(2)CH(2)COOH, CO, and HCOOH. ARD' converts I to CH(3)SCH(2)CH(2)COCOOH and HCOOH. Kinetic analyses suggest that both ARD and ARD' have ordered sequential mechanisms. A model substrate (II), a dethio analogue of I, binds to the enzyme first as evidenced by its lambda(max) red shift upon binding. The dianion formation from II causes the same lambda(max) red shift, suggesting that II bind to the enzyme as a dianion. The electron-rich II dianion likely reacts with O(2) to form a peroxide anion intermediate. Previous (18)O(2) and (14)C tracer experiments established that ARD incorporates (18)O(2) into C(1) and C(3) of II and C(2) is released as CO. ARD' incorporates (18)O(2) into C(1) and C(2) of II. The product distribution seems to necessitate the formation of a five-membered cyclic peroxide intermediate for ARD and a four-membered cyclic peroxide intermediate for ARD'. A model chemical reaction demonstrates the chemical and kinetic competency of the proposed five-membered cyclic peroxide intermediate. The breakdown of the four-membered and five-membered cyclic peroxide intermediates gives the ARD' and ARD products, respectively. The nature of the metal ion appears to dictate the attack site of the peroxide anion and, consequently, the different cyclic peroxide intermediates and the different oxidative cleavages of II. A cyclopropyl substrate analogue inactivates both enzymes after multiple turnovers, providing evidence that a radical mechanism may be involved in the formation of the peroxide anion intermediate.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Dai Y,Pochapsky TC,Abeles RHdoi
10.1021/bi010110ysubject
Has Abstractpub_date
2001-05-29 00:00:00pages
6379-87issue
21eissn
0006-2960issn
1520-4995pii
bi010110yjournal_volume
40pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::Alanine scanning mutagenesis, double mutant cycles, and X-ray crystallography were used to characterize the interface between the anti-hen egg white lysozyme (HEL) antibody D1.3 and HEL. Twelve out of the 13 nonglycine contact residues on HEL, as determined by the high-resolution crystal structure of the D1.3-HEL comp...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi980148j
更新日期:1998-06-02 00:00:00
abstract::The 2-thiocytidine residue at position 32 of tRNA1Arg from Escherichia coli was modified specifically with three photoaffinity reagents of different lengths, and the corresponding N-acetylarginyl-tRNA1Arg derivatives were cross-linked to the P site of E. coli 70S ribosomes by irradiation. Covalent attachment was depen...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00339a011
更新日期:1985-08-27 00:00:00
abstract::19F NMR spectroscopic properties of glycogen phosphorylase reconstituted with 6-fluoropyridoxal (6-FPAL) and 6-fluoropyridoxal phosphate (6-FPLP) were investigated. Analysis of the contribution of chemical shift anisotropy to the line width of the 6-FPLP-enzyme signal shows that the coenzyme molecule is tightly bound ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00356a015
更新日期:1986-04-22 00:00:00
abstract::The heptadecapeptides bombolitin I and bombolitin III are two of a series of peptides postulated to be biologically active within a membrane environment. In the preceding paper [Bairaktari, E., Mierke, D.F., Mammi, S., & Peggion, E. (1990) Biochemistry (preceding paper in this issue)] the conformational preferences of...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00495a012
更新日期:1990-10-30 00:00:00
abstract::The acetoacetate decarboxylase-like superfamily (ADCSF) is a little-explored group of enzymes that may contain new biocatalysts. The low level of sequence identity (∼20%) between many ADCSF enzymes and the confirmed acetoacetate decarboxylases led us to investigate the degree of diversity in the reaction and substrate...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.9b00652
更新日期:2019-10-08 00:00:00
abstract::The role of lateral diffusion in mitochondrial electron transport has been investigated by measuring the diffusion coefficients for lipid, cytochrome c, and cytochrome oxidase in membranes of giant mitoplasts from cuprizone-fed mice using the technique of fluorescence redistribution after photobleaching (FRAP). The di...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00331a017
更新日期:1985-05-07 00:00:00
abstract::Each homologous lobe of human serum transferrin (hTF) has one Fe(3+) ion bound by an aspartic acid, a histidine, two tyrosine residues, and two oxygens from the synergistic anion, carbonate. Extensive characterization of these ligands in the N-terminal lobe has been carried out. Despite sharing the same set of ligands...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi050015f
更新日期:2005-06-07 00:00:00
abstract::Protein kinase Calpha (PKCalpha) has been shown to contain two discrete activator sites with differing binding affinities for phorbol esters and diacylglycerols. The interaction of diacylglycerol with a low-affinity phorbol ester binding site leads to enhanced high-affinity phorbol ester binding and to a potentiated l...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi982778r
更新日期:1999-03-23 00:00:00
abstract::A bifunctional molecule was genetically engineered which contained an amino-terminal effector domain that bound immunoglobulin Fc (fragment B of staphylococcal protein A) and a carboxyl-terminal domain that bound digoxin [a single-chain Fv (sFv)]. Effector and sFv binding properties were virtually identical with those...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00487a005
更新日期:1990-09-04 00:00:00
abstract::Lysine side chains induce conformational changes in plasminogen (Pg) that regulate the process of fibrinolysis or blood clot dissolution. A lysine side-chain mimic, epsilon amino caproic acid (EACA), enhances the activation of Pg by urinary-type and tissue-type Pg activators but inhibits Pg activation induced by strep...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi992028x
更新日期:2000-04-25 00:00:00
abstract::Integrin conformational changes mediate integrin activation and signaling triggered by intracellular molecules or extracellular ligands. Even though it is known that αβ transmembrane domain separation is required for integrin signaling, it is still not clear how this signal is transmitted from the transmembrane domain...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi101462h
更新日期:2010-11-30 00:00:00
abstract::Incubation of 3-(2-phenylethyl)-4-methylsydnone (PMS) with liver microsomes from phenobarbital-pretreated rats or with reconstituted cytochrome P-450b results in loss of the enzyme chromophore. Chromophore loss is NADPH-dependent even though the sydnone decomposes by an oxygen- but not enzyme-dependent process to give...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00413a034
更新日期:1988-06-28 00:00:00
abstract::The interaction between the beta 2 subunit of tryptophan synthase and the coenzyme pyridoxal 5'-phosphate (PLP) is characterized by induced circular dichroism (CD) in the near-UV (260-285 nm) and in the visible region (320-480 nm, extrinsic Cotton effect). Because of its high mean residue ellipticity ([theta] = 56 deg...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00525a017
更新日期:1981-10-27 00:00:00
abstract::Excitation energy transfer studies were carried out to determine the distance between the adenosinetriphosphatase (ATPase) site and a unique "fast-reacting" sulfhydryl (referred to as SH1) in myosin subfragment 1. The fluorescent moiety of the probe N-(iodoacetyl)-N'-(5-sulfo-1-naphthyl)ethylene-diamine was used as th...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00520a035
更新日期:1981-08-18 00:00:00
abstract::Integrins are one of the major mediators of cellular adherence. Structurally the component alpha and beta chains are characterized by extensive intrachain disulfide bonding. The assignment of these bonds is currently based on homology with the chains of the integrin alphaIIbbeta3. However, recent crystallographic anal...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi034726u
更新日期:2003-11-11 00:00:00
abstract::The coordinated activity of protein tyrosine phosphatases (PTPs) is crucial for the initiation, modulation, and termination of diverse cellular processes. The catalytic activity of this protein depends on a nucleophilic cysteine at the active site that mediates the hydrolysis of the incoming phosphotyrosine substrate....
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi201092q
更新日期:2011-11-22 00:00:00
abstract::These investigations characterize the covalent binding of reactive products of prostaglandin H-synthases (PGHSs) to the enzyme and to other molecules. The intermediate product of oxygenation of arachidonic acid by the PGHSs, prostaglandin (PG) H2, undergoes rearrangement to the highly reactive gamma-keto aldehydes, le...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi002629k
更新日期:2001-06-12 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::The cAMP-dependent protein kinase (PKA) controls a large number of cellular functions. One critical PKA substrate in the brain and heart is the L-type Ca(2+) channel Ca(v)1.2, the activity of which is upregulated by PKA. The main PKA phosphorylation site is serine 1928 in the central pore forming alpha(1)1.2 subunit o...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi051593z
更新日期:2006-03-14 00:00:00
abstract::The enzyme RhlI catalyzes the formation of N-butyrylhomoserine lactone from S-adenosylmethionine and N-butyrylacyl carrier protein. N-Butyrylhomoserine lactone serves as a quorum-sensing signal molecule in Pseudomonas aeruginosa, and is implicated in the regulation of many processes involved in bacterial virulence and...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi048005m
更新日期:2005-03-01 00:00:00
abstract::We have used electron spin resonance and circular dichroism to examine and compare the dynamics in two analogues of the Ala-based 3K(I) peptide [Marqusee, S., Robbins, V.H., & Baldwin, R. L. (1989) Proc. Natl. Acad. Sci. U.S.A. 86, 5286-5290], labeled at positions 4 and 8, throughout the alpha-helix----coil transition...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00103a016
更新日期:1991-10-01 00:00:00
abstract::The calcium-dependent interaction of several annexins with membranes was studied. A novel technique was developed that allowed estimation of calcium binding to aggregating systems. This consisted of immobilized phospholipids on phenyl-Sepharose. Proteins associated with this affinity gel in the presence of radioactive...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00249a009
更新日期:1994-11-15 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::Human immunodeficiency virus type 1 protease (HIV-1 PR) is an essential enzyme in the HIV-1 life cycle. As such, this protein represents a major drug target in AIDS therapy, but emerging resistance to antiretroviral inhibitor cocktails, caused by high viral mutation rates, represents a significant challenge in AIDS tr...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi100569u
更新日期:2010-05-18 00:00:00
abstract::The solution of a primary 16S rRNA-binding ribosomal protein, S17, was investigated by two- and three-dimensional homonuclear and heteronuclear magnetic resonance spectroscopy. Almost complete chemical shift assignments for the 1H, 15N, and 13C resonances have been obtained. The NMR data have been rigorously analyzed ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi951062i
更新日期:1996-03-05 00:00:00
abstract::The fibrillation of misfolded neurodegenerative disease-related proteins has been extensively studied over the past few decades, but the initial oligomerization has been rarely examined even though some recent evidence indicated that small protein oligomers are more neurotoxic than long protein fibers. It is rather di...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.7b00966
更新日期:2017-12-19 00:00:00
abstract::In order to compare the interfacial behavior of the polyheme cytochromes c which belong to the cytochrome c3 superfamily, the monomolecular film technique was used to determine whether and how these metalloproteins interact with (phospho)lipids). Measurements of the variations of surface pressure and surface potential...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00036a005
更新日期:1995-09-12 00:00:00
abstract::Protein prenylation involves the attachment of a hydrophobic isoprenoid moiety to the C-terminus of proteins. Several small GTPases, including members of the Ras and Rho subfamilies, require prenylation for their normal and pathological functions. Recent work has suggested that SmgGDS proteins regulate the prenylation...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.8b00567
更新日期:2018-07-24 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::Acarbose is a naturally occurring pseudo-tetrasaccharide. It has been used in conjunction with other drugs in the treatment of diabetes where it acts as an inhibitor of intestinal glucosidases. To probe the interactions of acarbose with other carbohydrate recognition enzymes, the crystal structure of E. coli maltodext...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9828573
更新日期:1999-04-27 00:00:00