Search results for "Sh groups"
showing 5 items of 5 documents
Identification of disulphide bonds in the refolding of bovine pancreatic RNase A
1996
Background: Comprehension of the rules that govern the folding process is still far from satisfactory, though it is nevertheless clear that all the information required to define the folding is encoded in the amino acid sequence. In proteins that contain disulphide bonds, folding is associated with disulphide bond formation. Protein species with different numbers of disulphides tend to accumulate during the process; these species can be trapped in a stable form, by quenching any remaining free SH groups, and then characterized in order to identify the disulphide bonds formed. Results The refolding pathway of reduced and denatured RNase A has been studied using mass spectrometric strategies …
Effect of pinealectomy and circadian rhythm on avoidance behavior in the male rat.
1985
Male adult albino rats were divided into six groups: two pinealectomized (Px); two sham-operated (Sh) and two serving as controls (C). Half of these groups were studied in daylight and the other half at night. The animals were open-field tested and then conditioned by the avoidance behavior test in the appropriate light period. No differences were observed among the groups when they were conditioned in the dark; however, the Px were conditioned significantly more rapidly than Sh or C in daylight. Intragroup comparisons between night/day conditioning showed them to be similar in Px but more rapid at night in both Sh and C. The Sh group is unique and not comparable to controls.
Potentialgesteuerte SS-Bindungsspaltung und Fluoreszenzmarkierungsstudien am Beispiel des Rinderinsulins
1985
Die drei SS-Brucken im Insulin konnen galvanostatisch unter Bildung der SH-A-Kette und der SH-B-Kette (Produktgemisch I) aufgespalten werden. Potentiostatisch gelingt bei -1.3 V (vs. SCE) die selektive Offnung der zwei interchenaren Disulfidbrucken (Produktgemisch II). Die vier SH-Gruppen im Produktgemisch II werden mit dem Vinylsulfon 1 blockiert (Produktgemisch III). Im Produktgemisch III wird die intrachenare Disulfidbrucke in der teilblockierten A-Kette bei -1.8 V (vs. SCE) potentiostatisch reduktiv geoffnet und mit dem fluoreszierenden Arylvinylsulfon 2 geschutzt (Produktgemisch IV). Auch die SH-Gruppen in den Produktgemischen I und II werden durch die fluoreszierenden Vinylsulfone 2 u…
Role of SH-Groups and S-S Bridges in the Main Subunit (1/12 Molecule) of Spirographis Spallanzanii Chlorocruorin
1986
In all species of annelids described, the extracellular hemoglobins show (by electron microscopy) the same quaternary structure constituted by twelve identical subunits. The fine structure of the 1/12 subunit is not well resolved and several models have been proposed for it (2).
Gezielte und reversible Fluoreszenzmarkierung von SH-Lysozym mit Vinylsulfonen
1985
Am Beispiel von SH-Lysozym wird gezeigt, wie man SH-Gruppen reversibel mit den Vinylsulfonen 1–4 nach Gl. (a) selektiv blockieren und nach Gl. (b) selektiv deblockieren kann. Das wasserlosliche Vinylsulfon 2 macht das blockierte SH-Lysozym wasserloslich. Durch Einwirkung von NaOH-Losung wird nach Gl. (b) das wasserunlosliche SH-Lysozym regeneriert. Die fluoreszierenden Vinylsulfone 3 und 4 konnen als Fluoreszenzmarker nach verschiedenen Arbeitsweisen zum qualitativen Nachweis und zur quantitativen Bestimmung von SH-Gruppen herangezogen werden. Selective and Reversible Fluorescence Marking of SH-Lysozyme with Vinyl Sulfones The SH groups of SH-lysozyme as a model substance are selectively bl…