scholarly journals Isolation and characterization of an active three-chain molecular species of bovine thrombin

1976 ◽  
Vol 159 (1) ◽  
pp. 29-33 ◽  
Author(s):  
J R Giglio ◽  
A Rossi ◽  
F A Leone ◽  
G Chiericeto ◽  
J C Say
Keyword(s):  
Amino Acid ◽  
Molecular Species ◽  
Polyacrylamide Gel Electrophoresis ◽  
Active Form ◽  
Sodium Dodecyl ◽  
Trisodium Citrate ◽  
Peptide Bond ◽  
Coagulation Factors ◽  
Active Species ◽  
Isolation And Characterization

Partially purified bovine prothrombin was activated in half-saturated trisodium citrate seeded with thrombin, and the resulting thrombin was chromatographed on Amerblite IRC-50, followed by rechromatography on DEAE-Sephadex A-50. Five fractions, possessing both esterase and clotting activities, were partially isolated, but fraction VI was shown to be a pure three-chain active species with threonine, isoleucine and lysine, in 1:1:1 molar proportions as N-termini. The amino acid composition and C-termini of fraction VI were determinied. The molecular weights of the isolated chains, as determined by sodium dodecyl sulphate/polyacrylamide-gel electrophoresis, were 7300, 12000 and 19500 respectively. These data, when taken together with the amino acid sequence of the two-chain thrombin reported by Magnusson et al. (1975) [in Prothrombin and related Coagulation Factors, (Hember, H. C. & Veltkamp, J. J., eds.), pp. 25-46, Leiden University Press, Leiden], indicated that proteolysis occurred at the Arg(78)-Lys(79) peptide bond of the B chain of a precursor molecular species, thus converting this two-chain species into the three-chain active form described here.

Isolation and characterization of histones and other acid-soluble chromosomal proteins from Physarum polycephalum

1982 ◽  
Vol 60 (3) ◽  
pp. 263-271 ◽  
Author(s):  
Serge Côté ◽  
Paul Nadeau ◽  
James M. Neelin ◽  
Dominick Pallotta
Keyword(s):  
Amino Acid ◽  
Physarum Polycephalum ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
High Mobility ◽  
Apparent Molecular Weight ◽  
Chromosomal Protein ◽  
Basic Proteins ◽  
Isolation And Characterization ◽  
Core Histones

Chromosomal basic proteins were isolated from amoebal and plasmodial stages of the acellular slime mold Physarum polycephalum. Polyacrylamide electrophoresis on high resolution acid–urea gels separated the five histone fractions in the sequence H1, H2A, H2B, H3, andH4. Under these electrophoretic conditions Physarum histones migrated more like plant (rye) than animal (calf) histones. Furthermore, Physarum histones H1, H2A, and H2B have higher molecular weights on sodium dodecyl sulfate (SDS) gels than the corresponding calf fractions. No differences were detected between amoebal and plasmodial histones on either acid–urea or SDS–polyacrylamide gel electrophoresis. Amoebal basic proteins were fractionated by exclusion chromatography. The five histone fractions plus another major acid-soluble chromosomal protein (AS) were isolated. The Physarum core histones had amino acid compositions more closely resembling those of the calf core histones than of rye, yeast, or Dictyostelium. Although generally similar in composition to the plant and animal H1 histones, the Physarum H1 had a lower lysine content. The AS protein was extracted with 5% perchloric acid or 0.5 M NaCl, migrated between histones H3 and H4 on acid–urea polyacrylamide gels, and had an apparent molecular weight of 15 900 on SDS gels. It may be related to a protein migrating near H1. Both somewhat resembled the high mobility group proteins in amino acid composition.

scholarly journals Isolation and Characterization of a Novel Sialoglycopeptide Promoting Osteogenesis from Gadus morhua Eggs

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 156
Author(s):  
Zhiliang Hei ◽  
Meihui Zhao ◽  
Yingying Tian ◽  
Hong Chang ◽  
Xuanri Shen ◽  
...  
Keyword(s):  
Amino Acid ◽  
Gadus Morhua ◽  
Bone Growth ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Size Exclusion ◽  
Resonance Spectroscopy ◽  
Isolation And Characterization

Gadus morhua eggs contain several nutrients, including polyunsaturated fatty acids, lecithin and glycoproteins. A novel sialoglycopeptide from the eggs of G. morhua (Gm-SGPP) was extracted with 90% phenol and purified by Q Sepharose Fast Flow (QFF) ion exchange chromatography, followed by S-300 gel filtration chromatography. Gm-SGPP contained 63.7% carbohydrate, 16.2% protein and 18.6% N-acetylneuraminic acid. High-performance size exclusion chromatography and sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) demonstrated that Gm-SGPP is a 7000-Da pure sialoglycopeptide. β-elimination reaction suggested that Gm-SGPP contained N-glycan units. Amino acid N-terminal sequence analysis indicated the presence of Ala-Ser-Asn-Gly-Thr-Gln-Ala-Pro amino acid sequence. Moreover, N-glycan was connected at the third Asn location of the peptide chain through GlcNAc. Gm-SGPP was composed of D-mannose, D-glucuronic acid and D-galactose. Fourier transform-infrared spectroscopy (FT-IR), 1H-nuclear magnetic resonance spectroscopy (1H-NMR) and methylation analysis were performed to reveal the structure profile of Gm-SGPP. In vitro results showed that the proliferation activity of MC3T3-E1 cells was significantly promoted by Gm-SGPP. In vivo data revealed that Gm-SGPP increased the calcium and phosphorus content of tibias and promoted longitudinal bone growth in adolescent rats.

scholarly journals Characterization of CmaA, an Adenylation-Thiolation Didomain Enzyme Involved in the Biosynthesis of Coronatine

2004 ◽  
Vol 186 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Robin Couch ◽  
Sarah E. O'Connor ◽  
Heather Seidle ◽  
Christopher T. Walsh ◽  
Ronald Parry
Keyword(s):  
Amino Acid ◽  
Carboxylic Acid ◽  
Pseudomonas Syringae ◽  
Cyclopropane Ring ◽  
Polyacrylamide Gel Electrophoresis ◽  
Active Form ◽  
Sodium Dodecyl ◽  
Biosynthetic Gene Cluster ◽  
Amide Bond ◽  
T Domain

ABSTRACT Several pathovars of Pseudomonas syringae produce the phytotoxin coronatine (COR), which contains an unusual amino acid, the 1-amino-2-ethylcyclopropane carboxylic acid called coronamic acid (CMA), which is covalently linked to a polyketide-derived carboxylic acid, coronafacic acid, by an amide bond. The region of the COR biosynthetic gene cluster proposed to be responsible for CMA biosynthesis was resequenced, and errors in previously deposited cmaA sequences were corrected. These efforts allowed overproduction of P. syringae pv. glycinea PG4180 CmaA in P. syringae pv. syringae FF5 as a FLAG-tagged protein and overproduction of P. syringae pv. tomato CmaA in Escherichia coli as a His-tagged protein; both proteins were in an enzymatically active form. Sequence analysis of CmaA indicated that there were two domains, an adenylation domain (A domain) and a thiolation domain (T domain). ATP-32PPi exchange assays showed that the A domain of CmaA catalyzes the conversion of branched-chain l-amino acids and ATP into the corresponding aminoacyl-AMP derivatives, with a kinetic preference for l-allo-isoleucine. Additional experiments demonstrated that the T domain of CmaA, which is posttranslationally modified with a 4′-phosphopantetheinyl group, reacts with the AMP derivative of l-allo-isoleucine to produce an aminoacyl thiolester intermediate. This covalent species was detected by incubating CmaA with ATP and l-[G-3H]allo-isoleucine, followed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis. It is postulated that the l-allo-isoleucine covalently tethered to CmaA serves as the substrate for additional enzymes in the CMA biosynthetic pathway that catalyze cyclopropane ring formation, which is followed by thiolester hydrolysis, yielding free CMA. The availability of catalytically active CmaA should facilitate elucidation of the details of the subsequent steps in the formation of this novel cyclopropyl amino acid.

scholarly journals The molybdenum–iron protein of Klebsiella pneumoniae nitrogenase. Evidence for non-identical subunits from peptide ‘mapping’

1976 ◽  
Vol 155 (2) ◽  
pp. 383-389 ◽  
Author(s):  
C Kennedy ◽  
R R. Eady ◽  
E Kondorosi ◽  
D K Rekosh
Keyword(s):  
Amino Acid ◽  
Klebsiella Pneumoniae ◽  
Sodium Dodecyl Sulphate ◽  
Azotobacter Vinelandii ◽  
Peptide Mapping ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Amino Acid Content ◽  
Rhizobium Japonicum ◽  
Fe Protein

The molybdenum- and iron-containing protein components of nitrogenase purified from Klebsiella pneumoniae, Azotobacter vinelandii, Azotobacter chroococcum and Rhizobium japonicum bacteroids all gave either one or two protein-staining bands after sodium dodecyl sulphate/polyacrylamide-gel electrophoresis, depending on the commercial brand of sodium dodecyl sulphate used. The single band obtained with K. pneumoniae Mo-Fe protein when some commercial brands of sodium dodecyl sulphate were used in the preparation of the electrode buffer was resolved into two bands by the addition of 0.01% (v/v) dodecanol to the buffer. Protein extracted from the two bands obtained after electrophoresis of K. pneumoniae Mo-Fe protein gave unique and distinct peptide ‘maps’ after tryptic digestion. Undissociated Mo-Fe protein contained both sets of tryptic peptides. These data are consistent with Mo-Fe protein from K. pneumoniae being composed of non-identical subunits. Amino acid analyses of the subunit proteins revealed some clear differences in amino acid content, but the two subunits showed close compositional relatedness, with a different index [Metzer, H., Shapiro, M.B., Mosiman, J.E. & Vinton, J.G. (1968) Nature (London) 219, 1166-1168] of 4.7.

scholarly journals Biochemical characterization including amino acid and carbohydrate compositions of canine and human brain Thy-1 antigen

1981 ◽  
Vol 197 (3) ◽  
pp. 629-636 ◽  
Author(s):  
J L McKenzie ◽  
A K Allen ◽  
J W Fabre
Keyword(s):  
Monoclonal Antibody ◽  
Amino Acid ◽  
Human Brain ◽  
Affinity Chromatography ◽  
Gel Electrophoresis ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Gel Filtration ◽  
Antibody Affinity ◽  
Lentil Lectin

Human and canine brain Thy-1 antigens were solubilized in deoxycholate and antigen activity was followed both by conventional absorbed anti-brain xenosera of proven specificity and by mouse monoclonal antibodies to canine and human Thy-1. It is shown that greater than 80% of Thy-1 activity in the dog and man binds to lentil lectin, that the mobility on sodium dodecyl sulphate/polyacrylamide-gel electrophoresis of canine and human Thy-1 is identical with that of rat Thy-1 and that the Stokes radius in deoxycholate of canine and human brain Thy-1 is 3.0 nm and 3.25 nm respectively. Both lentil lectin affinity chromatography followed by gel-filtration chromatography on the one hand and monoclonal antibody affinity chromatography on the other gave high degrees of purification of the brain Thy-1 molecule in the dog and man, resulting in single bands staining for both protein and carbohydrate on sodium dodecyl sulphate/polyacrylamide-gel electrophoresis (except for a slight contaminant of higher molecular weight staining for protein but not carbohydrate with human Thy-1 purified by lentil lectin and gel-filtration chromatography). Analysis of canine and human brain Thy-1 purified by monoclonal antibody affinity chromatography with additional gel filtration through Sephadex G-200 showed that these molecules had respectively 38% and 36% carbohydrate. The amino acid and carbohydrate compositions were similar to those previously reported for Thy-1 of the rat and mouse, the main point of interest being the presence in canine and human brain Thy-1 of N-acetylgalactosamine, which has been reported in rat and mouse brain Thy-1 but not in Thy-1 from other tissues.

scholarly journals Structural properties of homogeneous protein disulphide-isomerase from bovine liver purified by a rapid high-yielding procedure

1983 ◽  
Vol 213 (1) ◽  
pp. 225-234 ◽  
Author(s):  
N Lambert ◽  
R B Freedman
Keyword(s):  
Amino Acid ◽  
Sodium Dodecyl Sulphate ◽  
Gel Electrophoresis ◽  
Specific Activity ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Sedimentation Coefficient ◽  
Bovine Liver ◽  
Polyacrylamide Gel ◽  
Protein Disulphide Isomerase

Protein disulphide-isomerase from bovine liver was purified to homogeneity as judged by sodium dodecyl sulphate/polyacrylamide-gel electrophoresis, two-dimensional electrophoresis and N-terminal amino acid analysis. The preparative procedure, a modification of that of Carmichael, Morin & Dixon [(1977) J. Biol. Chem. 252, 7163-7167], is much faster and higher-yielding than previous procedures, and the final purified material is of higher specific activity. The enzyme has Mr 57 000 as determined by sodium dodecyl sulphate/polyacrylamide-gel electrophoresis, both in the presence and in the absence of thiol compounds. Gel-filtration studies on Sephadex G-200 indicate an Mr of 107 000, suggesting that the native enzyme is a homodimer with no interchain disulphide bonds. Ultracentrifugation studies give a sedimentation coefficient of 3.5S, implying that the enzyme sediments as the monomer. The isoelectric point, in the presence of 8 M-urea, is 4.2, and some microheterogeneity is detectable. The amino acid composition is comparable with previous analyses of this enzyme from bovine liver and of other preparations of thiol:protein disulphide oxidoreductases whose relation to protein disulphide-isomerase has been controversial. The enzyme contains a very high proportion of Glx + Asx residues (27%). The N-terminal residue is His. The pure enzyme has a very small carbohydrate content, determined as 0.5-1.0% by the phenol/H2SO4 assay. Unless specific steps are taken to remove it, the purified enzyme contains a small amount (5 mol/mol of enzyme) of Triton X-100 carried through the purification.

scholarly journals Isolation and Characterization of Two Proteins fromMoraxella catarrhalis That Bear a Common Epitope

1998 ◽  
Vol 66 (9) ◽  
pp. 4374-4381 ◽  
Author(s):  
John C. McMichael ◽  
Michael J. Fiske ◽  
Ross A. Fredenburg ◽  
Deb N. Chakravarti ◽  
Karl R. VanDerMeid ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Gel Filtration ◽  
Bacterial Attachment ◽  
Vaccine Candidates ◽  
Isolation And Characterization ◽  
Sds Page

ABSTRACT The UspA1 and UspA2 proteins of Moraxella catarrhalisare potential vaccine candidates for preventing disease caused by this organism. We have characterized both proteins and evaluated their vaccine potential using both in vitro and in vivo assays. Both proteins were purified from the O35E isolate by Triton X-100 extraction, followed by ion-exchange and hydroxyapatite chromatography. Analysis of the sequences of internal peptides, prepared by enzymatic and chemical cleavage of the proteins, revealed that UspA1 and UspA2 exhibited distinct structural differences but shared a common sequence including an epitope recognized by the monoclonal antibody 17C7. By sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), purified UspA1 exhibited a molecular weight of approximately 350,000 when unheated and a molecular weight of 100,000 after being heated for 10 min at 100°C. In contrast, purified UspA2 exhibited an apparent molecular weight of 240,000 by SDS-PAGE that did not change with the length of time of heating. Their sizes as determined by gel filtration were 1,150,000 and 830,000 for UspA1 and UspA2, respectively. Preliminary results indicate the proteins have separate functions in bacterial pathogenesis. Purified UspA1 was found to bind HEp-2 cells, and sera against UspA1, but not against UspA2, blocked binding of the O35E isolate to the HEp-2 cells. UspA1 also bound fibronectin and appears to have a role in bacterial attachment. Purified UspA2, however, did not bind fibronectin but had an affinity for vitronectin. Both proteins elicited bactericidal antibodies in mice to homologous and heterologous disease isolates. Finally, mice immunized with each of the proteins, followed by pulmonary challenge with either the homologous or a heterologous isolate, cleared the bacteria more rapidly than mock-immunized mice. These results suggest that UspA1 and UspA2 serve different virulence functions and that both are promising vaccine candidates.

scholarly journals Biochemical and Genetic Characterization of an FK506-Sensitive Peptidyl Prolyl cis-trans Isomerase from a Thermophilic Archaeon, Methanococcus thermolithotrophicus

1998 ◽  
Vol 180 (2) ◽  
pp. 388-394 ◽  
Author(s):  
Masahiro Furutani ◽  
Toshii Iida ◽  
Shigeyuki Yamano ◽  
Kei Kamino ◽  
Tadashi Maruyama
Keyword(s):  
Amino Acid ◽  
Genomic Library ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Gel Filtration ◽  
Ppiase Activity ◽  
Methanococcus Thermolithotrophicus ◽  
Fk506 Binding Protein ◽  
Thermophilic Archaeon

ABSTRACT A peptidyl prolyl cis-trans isomerase (PPIase) was purified from a thermophilic methanogen, Methanococcus thermolithotrophicus. The PPIase activity was inhibited by FK506 but not by cyclosporine. The molecular mass of the purified enzyme was estimated to be 16 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and 42 kDa by gel filtration. The enzyme was thermostable, with the half-lives of its activity at 90 and 100°C being 90 and 30 min, respectively. The catalytic efficiencies (k cat/Km ) measured at 15°C for the peptidyl substrates,N-succinyl-Ala-Leu-Pro-Phe-p-nitroanilide andN-succinyl-Ala-Ala-Pro-Phe-p-nitroanilide, were 0.35 and 0.20 μM−1 s−1, respectively, in chymotrypsin-coupled assays. The purified enzyme was sensitive to FK506 and therefore was called MTFK (M. thermolithotrophicusFK506-binding protein). The MTFK gene (462 bp) was cloned from anM. thermolithotrophicus genomic library. The comparison of the amino acid sequence of MTFK with those of other FK506-binding PPIases revealed that MTFK has a 13-amino-acid insertion in the N-terminal region that is unique to thermophilic archaea. The relationship between the thermostable nature of MTFK and its structure is discussed.

scholarly journals The Human Cytomegalovirus UL74 Gene Encodes the Third Component of the Glycoprotein H-Glycoprotein L-Containing Envelope Complex

1998 ◽  
Vol 72 (10) ◽  
pp. 8191-8197 ◽  
Author(s):  
Mary T. Huber ◽  
Teresa Compton
Keyword(s):  
Amino Acid ◽  
Human Cytomegalovirus ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Open Reading Frames ◽  
Protein Species ◽  
Gene Encoding ◽  
Peptide Backbone ◽  
Glycoprotein H ◽  
Infected Cells

ABSTRACT The human cytomegalovirus (HCMV) gCIII envelope complex is composed of glycoprotein H (gH; gpUL75), glycoprotein L (gL; gpUL115), and a third, 125-kDa protein not related to gH or gL (M. T. Huber and T. Compton, J. Virol. 71:5391–5398, 1997; L. Li, J. A. Nelson, and W. J. Britt, J. Virol. 71:3090–3097, 1997). Glycosidase digestion analysis demonstrated that the 125-kDa protein was a glycoprotein containing ca. 60 kDa of N-linked oligosaccharides on a peptide backbone of 65 kDa or less. Based on these biochemical characteristics, two HCMV open reading frames, UL74 and TRL/IRL12, were identified as candidate genes for the 125-kDa glycoprotein. To identify the gene encoding the 125-kDa glycoprotein, we purified the gCIII complex, separated the components by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and subjected gH and the 125-kDa glycoprotein to amino acid microsequence analysis. Microsequencing of an internal peptide derived from purified 125-kDa glycoprotein yielded the amino acid sequence LYVGPTK. A FASTA search revealed an exact match of this sequence to amino acids 188 to 195 of the predicted product of the candidate gene UL74, which we have designated glycoprotein O (gO). Anti-gO antibodies reacted in immunoblots with a protein species migrating at ca. 100 to 125 kDa in lysates of HCMV-infected cells and with 100- and 125-kDa protein species in purified virions. Anti-gO antibodies also immunoprecipitated the gCIII complex and recognized the 125-kDa glycoprotein component of the gCIII complex. Positional homologs of the UL74 gene were found in other betaherpesviruses, and comparisons of the predicted products of the UL74 homolog genes demonstrated a number of conserved biochemical features.

Subunit studies of coupling factor 1 of bean chloroplasts

1976 ◽  
Vol 54 (5) ◽  
pp. 481-487 ◽  
Author(s):  
M. P. Silvanovich ◽  
R. D. Hill
Keyword(s):  
Amino Acid ◽  
Gel Electrophoresis ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Coupling Factor ◽  
Leaf Extracts ◽  
Molecular Weights ◽  
Major Species ◽  
Chloroplast Coupling Factor ◽  
Coupling Factors

A bean chloroplast coupling factor (CF1) with latent Ca2+-dependent ATPase activity was studied. Immunodiffusion of bean (Phaseolus vulgaris) chloroplast and etioplast coupling factors and spinach coupling factor against antiserum to spinach coupling factor showed partial identity of the bean coupling factor with that of spinach. An immunoelectrophoretic comparison, under dissociating conditions, of bean leaf extracts and spinach extracts containing CF1 subunits (as determined by sodium dodecyl sulfate polyacrylamide gel electrophoresis) gave identical results for both extracts. At least six distinct polypeptide species were found. The major species had molecular weights of 42 000, 59 000 and 63 000 daltons. Amino acid analysis of electrophoretically purified bean CF1 gave results similar to those published for spinach CF1.

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