Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0027960 (mole)
 21,279 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Protein sulfhydryl groups are histochemically demonstrated by reacting with DDD followed by coupling with Fast blue B. The molar absorptivity of the formed azo dye is 19000 per mole SH reacted. DDD simultaneously reacts with protein-SH- and -SS-groups. However, the reaction with SH-groups is approximately 1000 times faster than that observed with SS-groups. With Ehrlich ascites tumour cells the reaction of DDD with SH-groups is completed within 7 h while the reaction of DDD with SS-groups needs 14 days for completion. Due to the extreme difference in the reaction rates protein bound SH-groups as well as reactive SS-groups can be estimated quantitatively by cytospectrophotometrical methods. The cells investigated showed an average SH-content of (1,30 +/- 0,03) X 10(-14) M SH/cell while the average content of reactive SS-groups was (1,59 +/- 0,28) X 10(-14) M SS/cell. In addition it was found that especially the amount of reactive SS-groups per cell is not constant but exhibits seasonal variations.
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PMID:[Quantitative cytospectrometrical determination of protein sulfhydryl groups and reactive disulfide groups by the DDD-Fast blue B-staining method on Ehrlich ascites tumor cells (author's transl)]. 7 41

Dibrommercuryfluoresceine (DBMF) reacts stoichiometrically and quantitatively with the thiol group of cysteine, glutathione and thioglycolic acid respectively, at pH 7.0. Polarographical and spectrometrical titrations clearly show that in the spectra of the investigated mercaptides the wave length of the first absorption maximum of DMBF (507 nm) remains unchanged but the molar extinction coefficient increases by approximately 20%. Serum albumin, ovalbumin, beta-lactoglobulin and glyceraldehydephosphatedihydrogenase, after incubation with DBMF, form adducts with the dye from which the pure mercaptide complexes were separated by means of column chromatogrphy. These complexes were separated by means of column chromatography. These complexes show a bathochromic shift (520 nm) of the dye band which is decreased now by 50%. The molar extinction coefficient epsilon 520 has been determined from 32,000 to 33,850. On the basis of these values SH-contents of the four proteins were obtained which are in good accordance with data previously published in the literature. No selective reaction, f.i. with more accessible or/and reactive SH-groups was observed. After 30 min incubation with DBMF and washing with isotonic phosphate buffer, native animal tumor cells show in the main absorption band the bathochromically shifted dye maximum. A first temptative estimation of the protein SH-groups yielded 1.7-2.1 X 10(-14) mole SH/single cell. This result lies between the SH-content determined microspectrometrically on cells stained with DDD-Fast Blue B (1.1-1.55 X 10(-14)) and macroscopically on cell homogenates with DTNB (3.1 X 10(-14)). Up to now, no certain information can be given whether or to what extent unspecific absorption effects possibly might be involved in the data obtained with DBMF treated cells, but interaction with nucleic acids can be excluded with certainty on the basis of relevant model experiments.
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PMID:[Quantitative determination of sulfhydryl groups with "mercurochrome" (author's transl)]. 615 32