Abstract:
:Two thiol-activated endopeptidases with pH optima near pH 7.5 were isolated from the supernatant fraction of rabbit brain homogenates by DEAE-cellulose chromatography, gel filtration and isoelectrofocusing. Peptide bond hydrolysis was measured quantitatively by ion-exchange chromatography with an amino acid analyzer. Brain kininase A hydrolyzes the Phe5-Ser6 peptide bond in bradykinin (Bk), Arg1-Pro2-Pro3-Gly4-Phe5-Ser6-Pro7-Phe8-Arg9. It is isoelectric near pH 5.2 and has a molecular weight of approximately 71 000. The enzyme also hydrolyzes the Phe-Ser peptide bond in Lys-Bk, Met-Lys-Bk, des-Arg1-Bk, Lys9-Bk, Pro-Gly-Phe-Ser-Pro-Phe-Arg, and Gly-Pro-Phe-Ser-Pro-Phe-Arg, but does not hydrolyze (0.1%) this bond in des-Phe8-Arg9-Bk. Brain kininase B hydrolyzes the Pro7-Phe8 peptide bond in Bk. It is isoelectric at pH 4.9 and has a molecular weight of approximately 68 000. Brain kininase B also hydrolyzes the Pro-Phe bond in Lys-Bk, Met-Lys-Bk, Lys9-Bk, Ser-Pro-Phe-Arg, and Phe-Ser-Pro-Arg. Pretreatment of denatured kininogen with brain kininase A or B did not reduce the amount of trypsin-releasable Bk from this precursor protein, indicating that the Bk sequence, when part of a large protein, is not a substrate for either enzyme. However, kininase A and B hydrolyze the octadecapeptide Gly-Leu-Met-Lys-Arg-Pro-Pro-Gly-Phe-Ser-Pro-Phe-Arg-Ser-Val-Gin-Val. The data show that a large part of the C-terminal portion of bradykinin is important for the brain kininase A activity and, for both enzymes, the size of the peptide and presumably the residues adjacent to the scissle bond are important in determining the rate of peptide bond hydrolysis by these endopeptidases.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Oliveira EB,Martins AR,Camargo ACdoi
10.1021/bi00654a026subject
Has Abstractpub_date
1976-05-04 00:00:00pages
1967-74issue
9eissn
0006-2960issn
1520-4995journal_volume
15pub_type
杂志文章相关文献
BIOCHEMISTRY文献大全abstract::Regions of the negative strands of the satellite RNAs of chicory yellow mottle virus (sCYMV1) and arabis mosaic virus (sArMV) have similarity in sequence and predicted secondary structure compared to the tobacco ringspot virus satellite RNA (sTRSV) hairpin ribozyme, suggesting that they may also be catalytic RNAs of a...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00048a024
更新日期:1995-12-05 00:00:00
abstract::The specific deamidation of asparagine-71 of triosephosphate isomerase increases upon substrate binding and catalysis. This deamidation at the dimer interface initiates subunit dissociation, unfolding, and protein degradation. The apparent connection between catalysis and terminal marking supports the concept of "mole...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00188a027
更新日期:1994-06-07 00:00:00
abstract::This study presents an approach to identifying surface residues on membrane proteins that are exposed toward the membrane-aqueous interface. The method employs a lipid Ni(II) chelate that localizes the metal ion to a region near the membrane-aqueous interface. Lateral diffusion of the lipid chelate results in Heisenbe...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi015828s
更新日期:2002-01-29 00:00:00
abstract::Bacillus thuringiensis (Bt) insecticidal toxins bind to receptors on midgut epithelial cells of susceptible insects, and binding triggers biochemical events that lead to insect mortality. Recently, a 100-kDa aminopeptidase N (APN) was isolated from brush border membrane vesicles (BBMV) of Anopheles quadrimaculatus and...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi801181g
更新日期:2008-10-28 00:00:00
abstract::Human secretory group IIa phospholipase A2 (hIIa-PLA2) contains a large number of prominent cationic patches on its molecular surface and has exceptionally high affinity for anionic surfaces, including anionic membranes. To identify the cationic amino acid residues that support binding of hIIa-PLA2 to anionic membrane...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi971200z
更新日期:1997-11-25 00:00:00
abstract::Imidazolonepropionase (HutI) (imidazolone-5-propanote hydrolase, EC 3.5.2.7) is a member of the amidohydrolase superfamily and catalyzes the conversion of imidazolone-5-propanoate to N-formimino-L-glutamate in the histidine degradation pathway. We have determined the three-dimensional crystal structures of HutI from A...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi800180g
更新日期:2008-05-20 00:00:00
abstract::Monte Carlo protein simulations with continuum solvation were used to explore the conformational mobility of NO within the active site of metmyoglobin. To the best of our knowledge this is the first application of a continuum solvation model for exploring protein binding sites. The usefulness of the Monte Carlo confor...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi981611v
更新日期:1999-05-18 00:00:00
abstract::We have developed a new genomic sequencing method for detecting, with resolution at the nucleotide level, the interstrand DNA cross-links induced by 4,5',8-trimethylpsoralen along single-copy genes in mammalian cells. The cross-links (diadducts) initially formed are converted into monoadducts by alkali reversal prior ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi002539f
更新日期:2001-04-03 00:00:00
abstract::A method is presented for the rapid determination of substrate selection in a manner that is not restricted to conditions of metabolic and isotopic steady state. Competition between several substrates can be assessed directly and continuously in a single experiment, allowing the effect of interventions to be studied. ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00481a002
更新日期:1990-07-24 00:00:00
abstract::Methylmalonyl-CoA mutase from Propionibacterium shermanii is an adenosylcobalamin-dependent enzyme which catalyzes the reversible isomerization of methylmalonyl-CoA and succinyl-CoA. The rate of tritium loss from 5'-[3H]adenosylcobalamin during the enzymic reaction and the relative rates of tritium appearance in subst...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi961250o
更新日期:1996-09-10 00:00:00
abstract::Effects of different end sequences on melting, circular dichroism spectra (CD), and enzyme binding properties were investigated for four 40 base pair, non-self-complementary duplex DNA oligomers. The center sequences of these oligoduplexes have either of two 22 base pair modules flanked on both sides by sequences diff...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi000326k
更新日期:2000-07-04 00:00:00
abstract::Cytochrome b(561) in adrenal chromaffin vesicle membranes conveys electron equivalents from extravesicular ascorbate to the intravesicular monodehydroascorbate radical. We conducted a stopped-flow study on the reaction of ascorbate with purified cytochrome b(561) in the detergent-solubilized state for the first time. ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0267588
更新日期:2003-07-15 00:00:00
abstract::Photoactivated adenylyl cyclases are powerful tools for optogenetics and for investigating signal transduction mechanisms in biological photoreceptors. Because of its large increase in enzyme activity in the light, the BLUF (blue light sensor using flavin adenine dinucleotide)-activated adenylyl cyclase (bPAC) from Be...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi500479v
更新日期:2014-08-12 00:00:00
abstract::The actinomycin biosynthetic gene cluster of Streptomyces chrysomallus harbors two paralogous genes, acmI and acmL, encoding methyltransferases. To unveil their suspected role in the formation of 3-hydroxy-4-methyl-anthranilic acid (4-MHA), the building block of the actinomycin chromophore, each gene was expressed in ...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi101422r
更新日期:2010-11-16 00:00:00
abstract::Genetic knockout of the BtR4 gene encoding the Heliothis virescens cadherin-like protein (HevCaLP) is linked to resistance against Cry1Ac toxin from Bacillus thuringiensis. However, the functional Cry1Ac receptor role of this protein has not been established. We previously proposed HevCaLP as a shared binding site for...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi0606703
更新日期:2006-08-15 00:00:00
abstract::We have investigated the topology of the band 3 protein of the human erythrocyte membrane by a combination of chemical labeling and proteolytic cleavage. The N-terminal third of the membrane-bound domain of band 3 is a 17 000-dalton chymotryptic fragment that is known to traverse the membrane an odd number of times. A...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00321a024
更新日期:1984-12-18 00:00:00
abstract::GTPase-activating proteins (GAPs) enhance the intrinsic GTPase activity of small G proteins, such as Ras and Rho, by contributing a catalytic arginine to the active site. An intramolecular arginine plays a similar role in heterotrimeric G proteins. Aluminum fluoride activates the GDP form of heterotrimeric G proteins,...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi991358e
更新日期:1999-11-09 00:00:00
abstract::Chemosensory cilia isolated from the olfactory epithelium of Rana catesbeiana were solubilized with Lubrol PX in the presence of supplementary lipid, forskolin, and sodium fluoride. Subsequent removal of the detergent by adsorption onto Biobeads SM2 results in the formation of proteoliposomes that display forskolin- a...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00417a040
更新日期:1988-08-23 00:00:00
abstract::We examined the metabolism of exogenously added 13C-labeled fructose 1,6-bisphosphate (either labeled at the first and sixth carbons or labeled at the first carbon only) and of [2-13C]glucose in well-oxygenated and well-superfused hog carotid artery segments. Exogenously added fructose 1,6-bisphosphate was utilized by...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00004a027
更新日期:1995-01-31 00:00:00
abstract::Amyloid nucleation through agitation was studied with beta2-microglobulin, which is responsible for dialysis-related amyloidosis, in the presence of salt under acid and neutral pH conditions. First, the aggregation of beta2-microglobulin in NaCl solutions was achieved by mildly agitating for 24 h at 37 degrees C prote...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi701968g
更新日期:2008-02-26 00:00:00
abstract::p-Cresol methylhydroxylase (PCMH) isolated from Pseudomonas putida is an alpha 2 beta 2 tetramer of approximate subunit Mr 49,000 and 9,000. It is a flavocytochrome c containing covalently bound FAD in the larger subunit and covalently bound heme in the smaller. Crystals in space group P2(1)2(1)2(1) with unit-cell par...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00215a034
更新日期:1991-01-08 00:00:00
abstract::Nitroxyl (HNO), a potential heart failure therapeutic, is known to target cysteine residues to form sulfinamides and/or disulfides. Because HNO-derived modifications may depend on their local environment, we have investigated the reactivity of HNO with cysteine derivatives and C-terminal cysteine-containing peptides a...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi500360x
更新日期:2014-06-10 00:00:00
abstract::The melanocortin-4 receptor (MC4R) is involved in regulating energy homeostasis and is a potential therapeutic target for obesity and cachexia. Molecular interactions between peptide ligands and MC4R have been studied in detail. Less is known regarding the role of these interactions in the mechanism of MC4R activation...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi700406k
更新日期:2007-09-18 00:00:00
abstract::Calpains are intracellular calcium-activated cysteine proteases whose unregulated proteolysis following the loss of calcium homeostasis can lead to acute degeneration during ischemic episodes and trauma, as well as Alzheimer's disease and cataract formation. The determination of the crystal structure of the proteolyti...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi060425j
更新日期:2006-06-20 00:00:00
abstract::The BCL-2 gene encodes a 25 kDa membrane protein that plays critical roles in the control of apoptosis. The regulation of BCL-2 gene expression is highly complex and occurs both transcriptionally and posttranscriptionally. In particular, the 5' upstream region of BCL-2 contains a number of elements that control its ex...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi100957h
更新日期:2010-09-28 00:00:00
abstract::We report that recombinant glia maturation factor (GMF), a 17-kDa brain protein, inhibits the activity of mitogen-activated protein (MAP) kinase in the test tube assay, in particular the ERK1/ERK2 isoforms. A preliminary phosphorylation of GMF by protein kinase A (PKA) dramatically increases its inhibitory effect by o...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi960034c
更新日期:1996-05-21 00:00:00
abstract::F(1)-ATPase mutations in Escherichia coli that changed the strength of hydrogen bonds between the alpha and beta subunits in a location that links the catalytic site to the interface between the beta catch loop and the gamma subunit were examined. Loss of the ability to form the hydrogen bonds involving alphaS337, bet...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi052592+
更新日期:2006-09-19 00:00:00
abstract::Trifluoperazine (TFP) was shown to interact with the cyanogen bromide fragment 9 (CB9) (residues 84-135) of rabbit skeletal troponin C and with a synthetic peptide representing the N-terminal region of CB9. The phenothiazine did not affect the calcium binding property of CB9 as observed by proton magnetic resonance an...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi00276a010
更新日期:1983-03-29 00:00:00
abstract::To be fully active and participate in the metabolism of phosphorylated nucleotides, most nucleoside diphosphate kinases (NDPKs) have to assemble into stable hexamers. Here we studied the role played by six intersubunit salt bridges R80-D93 in the stability of NDPK from the pathogen Mycobacterium tuberculosis ( Mt). Mu...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/acs.biochem.8b01308
更新日期:2019-03-12 00:00:00
abstract::UDP-glucose:glycoprotein glucosyltransferase (UGT) is a soluble protein of the endoplasmic reticulum (ER) that operates as a gatekeeper for quality control by preventing transport of improperly folded glycoproteins out of the ER. We report the isolation of two cDNAs encoding human UDP-glucose:glycoprotein glucosyltran...
journal_title:Biochemistry
pub_type: 杂志文章
doi:10.1021/bi9916473
更新日期:2000-03-07 00:00:00