Isolation and characterization of two proteinase inhibitors from the male reproductive tract of mice

1981 ◽  
Vol 4 (6) ◽  
pp. 555-569 ◽  
Author(s):  
Gary R. Poirier ◽  
James Jackson
Keyword(s):  
Reproductive Tract ◽  
Proteinase Inhibitors ◽  
Male Reproductive Tract ◽  
Isolation And Characterization

Isolation and characterization of some proteinase inhibitors from Phaseolus vulgaris var. nanus

1980 ◽  
Vol 171 (1) ◽  
pp. 28-34 ◽  
Author(s):  
Holger Gerstenberg ◽  
Hans-Dieter Belitz ◽  
J�rgen K. P. Weder
Keyword(s):  
Phaseolus Vulgaris ◽  
Proteinase Inhibitors ◽  
Isolation And Characterization

scholarly journals Purification and characterization of a tetrameric α-macroglobulin proteinase inhibitor from the gastropod mollusc Biomphalaria glabrata

1996 ◽  
Vol 316 (3) ◽  
pp. 893-900 ◽  
Author(s):  
Randall C. BENDER ◽  
Christopher J. BAYNE
Keyword(s):  
Quaternary Structure ◽  
Proteinase Inhibitors ◽  
Cysteine Proteinase ◽  
Serine Proteinase ◽  
Biomphalaria Glabrata ◽  
Sedimentation Equilibrium ◽  
Flight Mass Spectrometry ◽  
Isolation And Characterization ◽  
Α2 Macroglobulin

The α-macroglobulin proteinase inhibitors (αMs) are a family of proteins with the unique ability to inhibit a broad spectrum of proteinases. Whereas monomeric, dimeric and tetrameric αMs have been identified in vertebrates, all invertebrate αMs characterized so far have been dimeric. This paper reports the isolation and characterization of a tetrameric αM from the tropical planorbid snail Biomphalaria glabrata. The sequence of 18 amino acids at the N-terminus indicates homology with other αMs. The subunit mass of approx. 200 kDa was determined by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and SDS/PAGE. The quaternary structure was determined by sedimentation equilibrium centrifugation and native pore-limit electrophoresis. Evidence for a thioester is provided by the fact that methylamine treatment prevents the autolytic cleavage of the snail αM subunit and results in the release of 4 mol of thiols per mol of snail αM. The snail αM inhibited the serine proteinase trypsin, the cysteine proteinase bromelain and the metalloproteinase thermolysin. The spectrum of proteinases inhibited, together with the demonstration of steric protection of the proteinase active site and a ‘slow to fast’ conformational change after reacting with trypsin, all suggest that the inhibitory mechanism of the snail αM is similar to the ‘trap mechanism’ of human α2-macroglobulin.

scholarly journals Isolation and characterization of lung connective-tissue glycoproteins

1982 ◽  
Vol 203 (3) ◽  
pp. 593-601 ◽  
Author(s):  
C Lafuma ◽  
M Moczar ◽  
L Robert
Keyword(s):  
Proteinase Inhibitors ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Gel Filtration ◽  
Lung Parenchyma ◽  
Isolation And Characterization ◽  
Isoelectric Points ◽  
And Function

1. Glycoproteins of hamster, rat and baboon lung parenchyma were investigated by using [14C]glucosamine incorporation in vitro followed by sequential extraction of the macromolecular components and characterization of the glycoproteins in the extracts. 2. Slices of lung parenchyma maintained in vitro incorporated [U-14C]glucosamine linearly with time into non-diffusible macromolecules for up to 5h. All the macromolecule-associated 14C label was present as [14C]glucosamine. 3. These 14C-labelled macromolecules were extracted from previously delipidated and salt-extracted lung by 5M-guanidinium chloride in the presence of dithiothreitol and proteinase inhibitors before (extract A1) and after (extract A2) hydrolysis of the collagen by collagenase. The [14C]glucosamine-labelled glycoproteins in extracts A1 and A2 contained 55 and 5% respectively of the total [14C]glucosamine incorporated in the lung of all three species studied. 4. The [14C]glucosamine-labelled glycoproteins were analysed by gel-filtration chromatography, sodium dodecyl sulphate/polyacrylamide-gel electrophoresis and isoelectric focusing. The major [14C]glucosamine-labelled glycoproteins of baboon lung parenchyma had apparent mol.wts. of about 400 000, 140 000 and 65 000 with isoelectric points respectively of 4.8, 5.4 and 5.4. The hamster lung glycoproteins with isoelectric points of 4.1 and 5.8 were devoid of hydroxyproline and contained galactose, mannose and N-acetylglucosamine. These experiments indicate that several distinct glycoproteins are synthesized in situ by the cells of pulmonary parenchyma and may well play a role in its structure and function.

Characterization of pannexin1 and pannexin3 and their regulation by androgens in the male reproductive tract of the adult rat

2011 ◽  
Vol 78 (2) ◽  
pp. 124-138 ◽  
Author(s):  
Patrick Turmel ◽  
Julie Dufresne ◽  
Louis Hermo ◽  
Charles E. Smith ◽  
Silvia Penuela ◽  
...  
Keyword(s):  
Reproductive Tract ◽  
Male Reproductive Tract ◽  
Adult Rat
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