Separation and molecular weight estimation of phosphatases in psoriatic scales by disc-electrophoresis

Disc-electrophoretic separation of water soluble proteins from scales of different forms of ichthyosis

In extracts of scales of different forms of ichthyosis, disc-electrophoretic separation of water soluble proteins was performed. Number and position of the protein bands correspond with number and position of the bands of extracts of normal keratin and psoriatic scales. However, in comparison to normal keratin, all examined forms of ichthyosis showed in zone II the enriched bands Nos. 6 and 7. This permits a distinct differentiation from psoriasis in which in zone II the bands Nos. 9 and 10 are enriched. In congenital ichthyosiform erythroderma and in ichthyosis combined with atopic dermatitis, in zone III the bands, containing gamma globulins, are enriched as an expression of the concomittant exudative process. The protein content of scale extracts of ichthyosis is 2 to 5 times lower than the one of psoriasis.

DNA-binding proteins of psoriatic scales. II. DNA-Affinity of the three characteristic proteins increased in the water soluble extract of psoriatic scales

The disc-electrophoretic pattern of a water soluble protein extract of psoriatic scales contains three characteristic proteins. They appear in higher amounts in psoriatic scales compared to normal human stratum corneum. Assuming that these proteins have any functional implication at DNA, their possible correlation to DNA-binding proteins (DBP) of psoriatic scales was examined. The disc-electrophoretic spectrum of DBP was compared with the protein profile of crude extract. However, no protein of DBP fraction correlated with one of the three characteristic proteins present in a water soluble extract. This signifies these proteins to be more a metabolically enriched product than proteins of chromosomal origin.

Separation, isolation, and amino acid composition of the albumin-like fraction from psoriatic scales

The albumin-like fraction of psoriatic scales was isolated either directly by slab gel electroporesis or after previous treatment with polyethylene glycol6000. After both isolation procedures the amino acid composition was determined. Both proteins were rich of glutamic acid, glycine, and alanine. On the other hand both contained very small amounts of cysteine and tyrosine. Only after the direct isolation procedure the amino-sugar galactosamine could be detected.