Abstract:
:7 beta-Hydroxysteroid dehydrogenase (7 beta-HSD) was produced by Ruminococcus sp. PO1-3 obtained from among human intestinal bacteria. The enzyme was purified from a crude extract by ammonium sulfate fractionation, and Butyl-Toyopearl 650M, Sephadex G-150, Matrex Red A and Octyl-Sepharose chromatographies. The purified enzyme was obtained as a single band on polyacrylamide gel electrophoresis with enzyme activity staining and as one band corresponding to a molecular weight of 30,000 on SDS-polyacrylamide gel electrophoresis. On gel filtration, its apparent molecular weight was estimated to be 60,000. The enzyme had a sulfhydryl group(s) in its active site. Substrate specificity studies revealed that the enzyme showed absolute specificity for the beta-configuration of a hydroxyl group at the 7 position of bile acids, and required NADP+ and NADPH as cosubstrates. The Km values for ursodeoxycholic acid, 7-k etolithocholic acid, NADP+, and NADPH were 5.0, 8.5, 7.7, and 24 microM, respectively.
journal_name
J Biochemjournal_title
Journal of biochemistryauthors
Akao T,Akao T,Kobashi Kdoi
10.1093/oxfordjournals.jbchem.a122095subject
Has Abstractpub_date
1987-09-01 00:00:00pages
613-9issue
3eissn
0021-924Xissn
1756-2651journal_volume
102pub_type
杂志文章abstract::When the body temperature of rats was brought to 42 degrees C, four heat-shock proteins, with molecular weights of 70,000, 71,000, 85,000, and 100,000 (hsp 70, hsp 71, hsp 85, and hsp 100, respectively), were induced in various tissues of the rats. The hsp 70 was strongly induced by hyperthermia, and its accumulation ...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a121889
更新日期:1987-01-01 00:00:00
abstract::The present study was undertaken in an attempt to clarify the pathway by which hyperosmotic stress induces HB-EGF gene expression in rat aortic smooth muscle cells (RASMC). Hyperosmotic stress induced by a high concentration of glucose or mannitol resulted in an increase in HB-EGF mRNA level in a dose- and time-depend...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a002993
更新日期:2001-09-01 00:00:00
abstract::1. Chymotrypsin cleaved troponin-T of skeletal muscle into two subfragments, i.e., troponin-T1 and -T2, each of which could be isolated by the use of DEAE-Sephadex. Troponin-T1 was a single subfragment with a molecular weight of 26,000 (chicken) or 22,000 (rabbit) daltons. Troponin-T2 consisted of two subfragments wit...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a132549
更新日期:1979-08-01 00:00:00
abstract::Glycoengineering of therapeutic proteins has been applied to improve the clinical efficacy of several therapeutics. Here, we examined the effect of glycosylation on the properties of the Fab of the therapeutic antibody, adalimumab. An N-glycosylation site was introduced at position 178 of the H-chain constant region o...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/jb/mvaa116
更新日期:2020-10-27 00:00:00
abstract::Genomic clones of UDP-glucuronosyltransferase family 1 (UGT1) were isolated from wild-type Wistar rats. The UGT1 locus spans > 120 kb and forms a gene complex. In this locus nine unique first exons encoding NH2-terminal portions of each isoform were located at intervals of approximately 10 kb and followed by only one ...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/jb/117.2.392
更新日期:1995-02-01 00:00:00
abstract::We previously reported that sera from various kinds of animals contain a protein(s) capable of inhibiting the growth of the non-malignant epithelial cell line derived from Buffalo rat liver (BRL). In the present study, a similar epithelial cell-specific growth inhibitor (EGI) was purified to homogeneity from an acid-e...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a121761
更新日期:1986-09-01 00:00:00
abstract::Previous studies have shown that purified mitochondrial outer membrane is able to catalyze the transfer of sialic acid from CMP-Neu5Ac to an exogenous asialoglycoprotein acceptor, asialofetuin. Considering the heterogeneity of the glycan chains borne by this glycoprotein, an investigation of mitochondrial sialyltransf...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a123644
更新日期:1991-11-01 00:00:00
abstract::Ras is a signal-transducing, guanine nucleotide-binding protein for various membrane receptors including tyrosine kinase receptors. Ras participates in the regulation of cell proliferation, differentiation, and morphology. Activated ras oncogenes have been identified in various forms of human cancer including epitheli...
journal_title:Journal of biochemistry
pub_type: 杂志文章,评审
doi:10.1093/oxfordjournals.jbchem.a022519
更新日期:1999-11-01 00:00:00
abstract::A rapid and simple method was developed for the purification of serine hydroxymethyltransferases [EC 2.1.2.1]. The procedure involved ammonium sulfate precipitation, DEAE-cellulose column chromatography and affinity chromatography on an L-adsorbent. Through this procedure the cytosolic enzyme (s-SHMT) was purified 1,6...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/jb/101.3.643
更新日期:1987-03-01 00:00:00
abstract::Yeast mitochondrial ATP synthase has three regulatory proteins, ATPase inhibitor, 9K protein, and 15K protein. The 9K protein binds directly to purified F1-ATPase, as does the ATPase inhibitor, but the 15K protein does not [Hashimoto, T. et al. (1987) J. Biochem. 102, 685-692]. In the present study, we found that 15K ...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a123154
更新日期:1990-07-01 00:00:00
abstract::The gene encoding subtilisin Amylosacchariticus from Bacillus subtilis var. amylosacchariticus was isolated and the entire nucleotide sequence of the coding sequence was determined. The deduced amino acid sequence revealed an N-terminal signal peptide and pro-peptide of 106 residues followed by the mature protein comp...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a122380
更新日期:1988-06-01 00:00:00
abstract::The complete amino acid sequence of acylphosphatase from rabbit skeletal muscle has been elucidated by automatic Edman degradation of peptides obtained from staphylococcal protease and trypsin digestions. The enzyme consisted of a single polypeptide chain of 98 amino acid residues, lacking only histidine. Its amino (N...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a135160
更新日期:1985-04-01 00:00:00
abstract::Phosphoenolpyruvate (PEP) carboxylase [EC 4.1.1.31] of E. coli was inactivated by 2,4,6-trinitrobenzene sulfonate (TNBS), a reagent known to attack amino groups in polypeptides. When the modified enzyme was hydrolyzed with acid, epsilon-trinitrophenyl lysine (TNP-lysine) was identified as a product. Close similarity o...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a132349
更新日期:1979-02-01 00:00:00
abstract::Mannan, a ligand for the mannose/N-acetylglucosamine (GlcNAc) receptor, induces suppression of oxygen consumption and increases glucose production in the perfused rat liver, and repeated infusion of mannan causes desensitization of the responses. In this study, we examined whether activation of Kupffer cells by endoto...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a021439
更新日期:1996-09-01 00:00:00
abstract::A method for preparation of pyridylamino (PA-) derivatives of O-linked sugar chains from glycoproteins was developed. A glycopeptide containing O-linked Gal beta 1-3GalNAc was prepared from fetuin and treated with anhydrous hydrazine followed by N-acetylation of free amino groups. Sugar chains released were pyridylami...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a123850
更新日期:1992-07-01 00:00:00
abstract::When the competitive inhibitor benzeneboronic acid (BBA) forms a complex with alpha-chymotrypsin [EC 3.4.21.1] protons are released in the acidic pH region. The proton release can be measured by a difference potentiometric technique. The proton release is also observed in chymotrypsinogen A but not in TRCK-, DIP-, and...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a131036
更新日期:1976-01-01 00:00:00
abstract::Cathepsin E, an intracellular aspartic proteinase of the pepsin family, is composed of two homologous domains, each containing the catalytic Asp residue in a consensus DTG motif. Here we examine the significance of residues in the motifs of rat cathepsin E by substitution of Asp98, Asp283, and Thr284 with other residu...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a003247
更新日期:2002-09-01 00:00:00
abstract::Kinetic studies of the two beta-glucosidase isozymes, GB-1 and GB-2, which were from the culture filtrate of a phytopathogenic fungus Pyricularia oryzae, revaled that the latter isozyme was an allosteric protein with two substrate binding sites. The homotropic effects of o- and m-nitrophenyl-beta-D-glucosides on GB-2 ...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:
更新日期:1980-04-01 00:00:00
abstract::The gene of an extreme thermophile, Thermus thermophilus HB8, which codes for a leucine biosynthetic enzyme, 3-isopropylmalate (3-IPM) dehydrogenase [EC 1.1.1.85], was cloned in Escherichia coli using pBR322 as a vector. E. coli cells carrying this recombinant plasmid, pHB2, produced the thermophilic enzyme 7-fold mor...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a133245
更新日期:1981-02-01 00:00:00
abstract::1. As a part of studies on the mechanism by which catecholamines are released from the nerve terminals, the synaptic vesicle fraction was isolated from bovine caudatolenticular nuclei and thalamus by differential centrifugation essentially according to the method of Kadota and Kadota (17). 2. Further centrifugation on...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a131747
更新日期:1977-09-01 00:00:00
abstract::We have recently demonstrated the localization of associated m-calpain and calpastatin in the endoplasmic reticulum (ER) of bovine pulmonary artery smooth muscle. Herein, we sought to determine the role of m-calpain on calcium-dependent proteolytic cleavage of Na(+)/Ca(2+) exchanger (NCX) in the ER. Treatment of the E...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/jb/mvp176
更新日期:2010-02-01 00:00:00
abstract::We previously reported that caldesmon (CaD), together with tropomyosin (TM), effectively protects actin filaments from gelsolin, an actin-severing protein. To elucidate the structure/function relationship of CaD, we dissected the functional domain of CaD required for the protection. The basic C-terminal half of rat no...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/jb/mvi181
更新日期:2005-12-01 00:00:00
abstract::The effect of the ODC-factor, which was partially purified from ascites fluid of mice bearing Ehrlich ascites hepatoma, on DNA synthesis in the normal mouse liver and spleen was studied, and target cells for the factor in the liver were examined. DNA synthesis in the liver increased about 4-fold over the basal level 3...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a134438
更新日期:1983-09-01 00:00:00
abstract::Hydrostatic pressure-induced morphological and physiochemical changes in monomeric myosin were investigated. The turbidity of a myosin solution increased after release of pressure, indicating aggregation of the molecules. Some molecules were single headed after exposure to 100-200 MPa, in contrast with an intact molec...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a124496
更新日期:1994-07-01 00:00:00
abstract::In regenerating rat liver, nuclear protein histone H2A was shown to be phosphorylated on its amino-terminal serine residue [Sung et al. (1971) J. Biol. Chem. 246, 1358-1364], but the protein kinase which phosphorylates this residue has not been identified. To evaluate the possibility that protein kinase C can phosphor...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a123837
更新日期:1992-06-01 00:00:00
abstract::The binding of nuclear envelope precursor vesicles and chromatin was characterized by using an in vitro system constituted from a Xenopus egg extract and demembranated Xenopus sperm chromatin. The results of binding studies in the presence of salts, urea, and a chelator showed that the binding involves an ionic intera...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a021842
更新日期:1997-11-01 00:00:00
abstract::Sialoglycoprotein which exhibits inhibitory activity for hemagglutination by Hemagglutinating Virus of Japan (HVJ, Sendai virus) was isolated from the membrane of bovine erythrocytes. Purification steps for this sialoglycoprotein included extraction with lithium diiodosalicylate, phenol partition, precipitation with e...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a134301
更新日期:1983-06-01 00:00:00
abstract::Mitochondria are dynamic organelles that frequently divide and fuse together, resulting in the formation of intracellular tubular networks. In yeast and mammals, several factors including Drp1/Dnm1 and Mfn/Fzo1 are known to regulate mitochondrial morphology by controlling membrane fission or fusion. Here, we report th...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/jb/mvm245
更新日期:2008-04-01 00:00:00
abstract::To better understand the regulation of ryudocan (syndecan-4) expression, we have determined the structural organization of the human ryudocan gene. The human ryudocan gene extends approximately 24 kilobases and is divided into five exons, which appear to be conserved in syndecan family members. Exon I encodes the sign...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a021338
更新日期:1996-05-01 00:00:00
abstract::Lactosylceramide and paragloboside were synthesized from their precursor glycolipids and UDP-galactose by lactose synthase A protein [UDP-Gal : GlcNAc beta-4-galactosyltransferase, EC 2.4.1.22] purified to homogeneity from human plasma. The partially purified human liver enzyme and an extract from human lymphoblastoid...
journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a134028
更新日期:1982-10-01 00:00:00