PURIFICATION OF PROTHROMBIN AND THROMBIN BY CHROMATOGRAPHY ON CELLULOSE

1960 ◽  
Vol 38 (1) ◽  
pp. 1405-1410 ◽  
Author(s):  
Walter H. Seegers ◽  
Ricardo H. Landaburu
Keyword(s):  
Amino Acid ◽  
Sodium Citrate ◽  
Fundamental Difference ◽  
High Yield ◽  
Citrate Solution ◽  
Terminal Amino Acid ◽  
Protamine Sulphate ◽  
Bovine Thrombin ◽  
Diethylaminoethyl Cellulose ◽  
Terminal Amino

A method is described for obtaining purified bovine thrombin by chromatography on phosphate cellulose, and purified bovine prothrombin by chromatography on diethylaminoethyl cellulose. Both proteins are obtained as single components, and in high yield. The purified prothrombin does not convert to thrombin in 25% sodium citrate solution or protamine sulphate solution. The N-terminal amino acid is the same as in purified prothrombin obtained by different methods in this laboratory, but instead of tyrosine and glycine the C-terminal amino acid is serine. A fundamental difference in structure is thus associated with altered activation characteristics.

PURIFICATION OF PROTHROMBIN AND THROMBIN BY CHROMATOGRAPHY ON CELLULOSE

1960 ◽  
Vol 38 (12) ◽  
pp. 1405-1410 ◽  
Author(s):  
Walter H. Seegers ◽  
Ricardo H. Landaburu
Keyword(s):  
Amino Acid ◽  
Sodium Citrate ◽  
Fundamental Difference ◽  
High Yield ◽  
Citrate Solution ◽  
Terminal Amino Acid ◽  
Protamine Sulphate ◽  
Bovine Thrombin ◽  
Diethylaminoethyl Cellulose ◽  
Terminal Amino

A method is described for obtaining purified bovine thrombin by chromatography on phosphate cellulose, and purified bovine prothrombin by chromatography on diethylaminoethyl cellulose. Both proteins are obtained as single components, and in high yield. The purified prothrombin does not convert to thrombin in 25% sodium citrate solution or protamine sulphate solution. The N-terminal amino acid is the same as in purified prothrombin obtained by different methods in this laboratory, but instead of tyrosine and glycine the C-terminal amino acid is serine. A fundamental difference in structure is thus associated with altered activation characteristics.

SOME PROPERTIES OF THROMBIN PREPARATIONS

1959 ◽  
Vol 37 (1) ◽  
pp. 775-785 ◽  
Author(s):  
Walter H. Seegers ◽  
Gerardo Casillas ◽  
Robert S. Shepard ◽  
William R. Thomas ◽  
Paul Halick
Keyword(s):  
Esterase Activity ◽  
Sodium Citrate ◽  
Citrate Solution ◽  
Ideal Model ◽  
Terminal Amino Acid ◽  
Two Stage ◽  
Analytical Reagents ◽  
Terminal Amino ◽  
Autocatalytic Activation ◽  
Prothrombin Activation

Bio-resin thrombin preparations were found to contain three weak precipitinogens. The clotting activity was not demonstrably associated with the precipitinogenic systems. Further, work was done on methods for the purification of citrate resin thrombin, and its clotting activity is also not associated with a precipitinogenic system. The N-terminal amino acid of both bio-resin thrombin and citrate resin thrombin was found to be glutamic acid. The two preparations were found to be homogeneous upon ultracentrifugal examination and could not be differentiated on the basis of sedimentation constants. Since "citrate" activation and "bio" activation produce eventually similar thrombin material, the autocatalytic activation of prothrombin in 25% sodium citrate solution can be used as an ideal model of prothrombin activation. The prothrombin first dissociates to form a derivative that does not form thrombin in the two-stage analytical reagents. Then a second alteration occurs in which the derivative again may form thrombin in the two-stage analytical reagents. Then thrombin activity appears as esterase activity, then as clotting activity. Later the clotting activity may be lost and finally also the esterase activity. The original prothrombin is a precipitinogen while the active thrombin is not.

scholarly journals Determination of Peptide Contact Points in the Human Angiotensin II Type I Receptor (AT1) with Photosensitive Analogs of Angiotensin II

1999 ◽  
Vol 13 (4) ◽  
pp. 578-586 ◽  
Author(s):  
Stéphane A. Laporte ◽  
Antony A. Boucard ◽  
Guy Servant ◽  
Gaétan Guillemette ◽  
Richard Leduc ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Angiotensin Ii ◽  
Transmembrane Domain ◽  
At1 Receptor ◽  
High Yield ◽  
Type I ◽  
Terminal Amino Acid ◽  
Contact Points ◽  
Terminal Amino

Abstract To identify ligand-binding domains of Angiotensin II (AngII) type 1 receptor (AT1), two different radiolabeled photoreactive AngII analogs were prepared by replacing either the first or the last amino acid of the octapeptide by p-benzoyl-l-phenylalanine (Bpa). High yield, specific labeling of the AT1 receptor was obtained with the 125I-[Sar1,Bpa8]AngII analog. Digestion of the covalent 125I-[Sar1,Bpa8]AngII-AT1 complex with V8 protease generated two major fragments of 15.8 kDa and 17.8 kDa, as determined by SDS-PAGE. Treatment of the[ Sar1,Bpa8]AngII-AT1 complex with cyanogen bromide produced a major fragment of 7.5 kDa which, upon further digestion with endoproteinase Lys-C, generated a fragment of 3.6 kDa. Since the 7.5-kDa fragment was sensitive to hydrolysis by 2-nitro-5-thiocyanobenzoic acid, we circumscribed the labeling site of 125I-[Sar1,Bpa8]AngII within amino acids 285 and 295 of the AT1 receptor. When the AT1 receptor was photolabeled with 125I-[Bpa1]AngII, a poor incorporation yield was obtained. Cleavage of the labeled receptor with endoproteinase Lys-C produced a glycopeptide of 31 kDa, which upon deglycosylation showed an apparent molecular mass of 7.5 kDa, delimiting the labeling site of 125I-[Bpa1]AngII within amino acids 147 and 199 of the AT1 receptor. CNBr digestion of the hAT1 I165M mutant receptor narrowed down the labeling site to the fragment 166–199. Taken together, these results indicate that the seventh transmembrane domain of the AT1 receptor interacts strongly with the C-terminal amino acid of[ Sar1, Bpa8]AngII, whereas the N-terminal amino acid of[ Bpa1]AngII interacts with the second extracellular loop of the AT1 receptor.

SOME PROPERTIES OF THROMBIN PREPARATIONS

1959 ◽  
Vol 37 (6) ◽  
pp. 775-785 ◽  
Author(s):  
Walter H. Seegers ◽  
Gerardo Casillas ◽  
Robert S. Shepard ◽  
William R. Thomas ◽  
Paul Halick
Keyword(s):  
Esterase Activity ◽  
Sodium Citrate ◽  
Citrate Solution ◽  
Ideal Model ◽  
Terminal Amino Acid ◽  
Two Stage ◽  
Analytical Reagents ◽  
Terminal Amino ◽  
Autocatalytic Activation ◽  
Prothrombin Activation

Bio-resin thrombin preparations were found to contain three weak precipitinogens. The clotting activity was not demonstrably associated with the precipitinogenic systems. Further, work was done on methods for the purification of citrate resin thrombin, and its clotting activity is also not associated with a precipitinogenic system. The N-terminal amino acid of both bio-resin thrombin and citrate resin thrombin was found to be glutamic acid. The two preparations were found to be homogeneous upon ultracentrifugal examination and could not be differentiated on the basis of sedimentation constants. Since "citrate" activation and "bio" activation produce eventually similar thrombin material, the autocatalytic activation of prothrombin in 25% sodium citrate solution can be used as an ideal model of prothrombin activation. The prothrombin first dissociates to form a derivative that does not form thrombin in the two-stage analytical reagents. Then a second alteration occurs in which the derivative again may form thrombin in the two-stage analytical reagents. Then thrombin activity appears as esterase activity, then as clotting activity. Later the clotting activity may be lost and finally also the esterase activity. The original prothrombin is a precipitinogen while the active thrombin is not.

Peptides Associated with Bovine Thrombin Preparations

1961 ◽  
Vol 06 (03) ◽  
pp. 424-434 ◽  
Author(s):  
Ricardo H. Landaburu ◽  
Charles R. Harmison ◽  
Walter H. Seegers
Keyword(s):  
Amino Acid ◽  
Specific Activity ◽  
Rate Of Change ◽  
Urea Solution ◽  
Terminal Amino Acid ◽  
Bovine Thrombin ◽  
Sedimentation Constant ◽  
Main Protein ◽  
Terminal Amino ◽  
Polypeptide Chains

SummaryWhen bovine thrombin was prepared by one method the N-terminal amino acid was glutamic acid while with another method it was threonine. In urea solution these N-terminal amino acids were removed in association with peptides and the N-terminal amino acid of the main protein was leucine. Urea treated thrombin had the same specific activity as the original from which it was prepared, and also had the same carbohydrate content. It was, however, less soluble in water and had a higher viscosity. The sedimentation constant was concentration dependent. Before treatment with urea the rate of change of the sedimentation constant with concentration was positive. After urea treatment it was negative. Extrapolation to zero concentration gave the same value for thrombin as for urea treated thrombin. The peptides removed from thrombin function to alter the properties of the protein. They are attached by bonds that are broken in urea solution. Very likely the original prothrombin molecule is, in part at least, composed of sub-units consisting of polypeptide chains held together by bonds broken by reagents such as sodium citrate. In addition to alanine, bovine prothrombin has arginine as N-terminal amino acid, but the latter was uncovered only in urea solution.

Activation of Purified Prothrombin to Autoprothrombin I or Autoprothrombin II (Platelet Cofactor II or Autoprothrombin II-A)

1961 ◽  
Vol 05 (02) ◽  
pp. 218-249 ◽  
Author(s):  
Eberhard F. Mammen ◽  
William R. Thomas ◽  
Walter H. Seegers
Keyword(s):  
Amino Acid ◽  
Ammonium Sulfate ◽  
Calcium Ions ◽  
Hemophilia A ◽  
Clotting Time ◽  
Terminal Amino Acid ◽  
Sedimentation Constant ◽  
Diethylaminoethyl Cellulose ◽  
Terminal Amino ◽  
Frozen State

SummaryAutoprothrombin I, autoprothrombin II, and autoprothrombin II-A have been derived from bovine prothrombin and concentrated.Autoprothrombin I is formed when thrombin is used to activate prothrombin which has been chromatographed on IRC-50 or diethylaminoethyl cellulose. The activation is inhibited by calcium ions, and goes more rapidly as the alkalinity is increased up to pH 9.7. During the activation the liberation of acidic groups predominates over that of the basic groups. In activation mixtures proline, alanine, threonine and valine were found as N-terminal amino acids. The activity was identified with a fraction that contained N-terminal valine, but an alteration can be made with IRC-50 so that the activity is all retained with a change in N-terminal amino acid. The activity is tentatively ascribed to a molecule that has a sedimentation constant of 3.8 in an ultracentrifuge. The autoprothrombin I was found to be soluble in ammonium sulfate solution at 50% of saturation and precipitated when the salt concentration is at 70% of saturation. There was very little loss of activity associated with drying from the frozen state at pH 8.0. Acetone precipitation destroyed the activity, and acidification predisposed to a loss in activity.All prothrombin preparations we have worked with develop autoprothrombin I activity in the presence of platelet factor 3 and calcium ions, but not, if the calcium ions are not there. The solubility of the protein is the same as when obtained by thrombin activation or by separation from serum.Autoprothrombin II is formed when purified thrombin is used to activate non-chromatographed prothrombin. The activation is inhibited with calcium ions, and there is a pH optimum between 7 and 8. During activation nonbuffered solutions become acidic. The activity is identified with a fraction in which the N-terminal amino acid is proline and the C-terminal amino acid is tyrosine. The activity was concentrated in a fraction that was practically homogenous upon ultracentrifuge analysis. The sedimentation constant is near S = 3.7 (tentative). The activity is easily precipitated at 50% of saturation with ammonium sulfate. No activity was lost upon dialysis or drying from the frozen state around pH 7 to 8. The concentrates with autoprothrombin I activity are precipitinogenic against antiprothrombin and anti-bovine serum. The autoprothrombin II of serum is also precipitated at 50% of saturation with ammonium sulfate.Autoprothrombin II-A is an anticoagulant that was found to be closely related to autoprothrombin II in physical chemical characteristics. The anticoagulant had arginine as N-terminal amino acid and tyrosine as C-terminal amino acid. After IRC-50 resin chromatography the autoprothrombin II-A protein was found to be changed and had autoprothrombin II activity, N-terminal proline and C-terminal tyrosine. The autoprothrombin II-A activity was retained during dialysis and during drying from the frozen state. The sedimentation constant found with the ultracentrifuge was 3.8. The activity was also found in concentrates from serum.Autoprothrombin II corrects the recalcified clotting time of PTC deficient plasma. Hemophilia A blood clots rapidly with autoprothrombin II. The recalcified clotting time of hemophilia A plasma is also brought to the normal range with concentrates of autoprothrombin II. In general the prothrombin utilization does not seem to be increased when the procoagulant is added to hemophilic blood or plasma.

Immunoelectron microscope detection of C-type natriuretic peptide in normal human atrial tissue

1993 ◽  
Vol 51 ◽  
pp. 388-389
Author(s):  
Chi-Ming Wei ◽  
Margaret Hukee ◽  
Christopher G.A. McGregor ◽  
John C. Burnett
Keyword(s):  
Amino Acid ◽  
Natriuretic Peptide ◽  
Vascular Tone ◽  
Cardiac Tissue ◽  
Ring Structure ◽  
Terminal Amino Acid ◽  
Amino Acid Peptide ◽  
Normal Human ◽  
Terminal Amino ◽  
The Brain

C-type natriuretic peptide (CNP) is a newly identified peptide that is structurally related to atrial (ANP) and brain natriuretic peptide (BNP). CNP exists as a 22-amino acid peptide and like ANP and BNP has a 17-amino acid ring formed by a disulfide bond. Unlike these two previously identified cardiac peptides, CNP lacks the COOH-terminal amino acid extension from the ring structure. ANP, BNP and CNP decrease cardiac preload, but unlike ANP and BNP, CNP is not natriuretic. While ANP and BNP have been localized to the heart, recent investigations have failed to detect CNP mRNA in the myocardium although small concentrations of CNP are detectable in the porcine myocardium. While originally localized to the brain, recent investigations have localized CNP to endothelial cells consistent with a paracrine role for CNP in the control of vascular tone. While CNP has been detected in cardiac tissue by radioimmunoassay, no studies have demonstrated CNP localization in normal human heart by immunoelectron microscopy.

PURIFICATION AND PARTIAL CHEMICAL CHARACTERIZATION OF SHEEP NEUROPHYSIN

1973 ◽  
Vol 74 (2) ◽  
pp. 226-236 ◽  
Author(s):  
Michel Chrétien ◽  
Claude Gilardeau
Keyword(s):  
Amino Acid ◽  
Polyacrylamide Gel Electrophoresis ◽  
Chemical Characterization ◽  
Terminal Amino Acid ◽  
Amino Acid Determination ◽  
Pituitary Glands ◽  
Terminal Amino ◽  
Partial Chemical ◽  
Acid Determination

ABSTRACT A protein isolated from ovine pituitary glands has been purified, and its homogeneity assessed by NH2- and COOH-terminal amino acid determination, ultracentrifugation studies, and polyacrylamide gel electrophoresis after carboxymethylation. Its chemical and immunochemical properties are closely similar to those of beef and pork neurophysins, less similar to those of human neurophysins. It contains no tryptophan (like other neurophysins) or histidine (like all except bovine neurophysin-I and human neurophysins). It has alanine at the NH2-terminus and valine at the COOH-terminus. Its amino acid composition is similar to, but not identical with those of porcine and bovine neurophysins.

C-Terminal amino acid sequence of chicken pepsinogen and its homology with sequences of other acid proteases

1980 ◽  
Vol 45 (4) ◽  
pp. 1144-1154 ◽  
Author(s):  
Miroslav Baudyš ◽  
Helena Keilová ◽  
Vladimír Kostka
Keyword(s):  
Amino Acid ◽  
Amino Acid Sequence ◽  
The Other ◽  
Terminal Sequence ◽  
Terminal Part ◽  
Terminal Amino Acid ◽  
Tryptic Peptides ◽  
Terminal Amino ◽  
High Degree ◽  
Terminal Amino Acid Sequence

To determine the primary structure of the C-terminal part of the molecule of chicken pepsinogen the tryptic, chymotryptic and thermolytic digest of the protein were investigated and peptides derived from this region were sought. These peptides permitted the following 21-residue C-terminal sequence to be determined: ...Ile-Arg-Glu-Tyr-Tyr-Val-Ile-Phe-Asp-Arg-Ala-Asn-Asn-Lys-Val-Gly-Leu-Ser-Pro-Leu-Ser.COOH. A comparison of this structure with the C-terminal sequential regions of the other acid proteases shows a high degree of homology between chicken pepsinogen and these proteases (e.g., the degree of homology with respect to hog pepsinogen and calf prochymosin is about 66%). Additional tryptic peptides, derived from the N-terminal part of the zymogen molecule whose amino acid sequence has been reported before, were also obtained in this study. This sequence was extended by two residues using an overlapping peptide. An ancillary result of this study was the isolation of tryptic peptides derived from other regions of the zymogen molecule.

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