Studies on the nature of the equine protease inhibitors.

The research involves the use of a specific technique to investigate three selected horse Pi serum phenotypes. This method helps in detecting Pi zones otherwise not easily identified through other techniques. The study also compares the results with those derived from antigen-antibody crossed electrophoresis and observes the variations.

Experimental Technique and Analysis

• The experiment utilizes a technique based on the protease-binding capacity of the equine Pi (Pr) protein. This method is able to identify Pi zones that traditional protein staining and electrophoretic techniques may fail to detect.
• Three specific horse Pi serum phenotypes, namely Pi LL, Pi NN, and Pi UU, are investigated using this technique. These serum samples then undergo antigen-antibody crossed electrophoresis, and the results are compared with the trypsin-binding zones identified on the starch gel.

Distinct Phenotypic Observations

• For five Pi LL phenotypes, the trypsin-binding zones corresponded accurately with the peaks in the antigen-antibody crossed electrophoresis.
• However, in five Pi NN phenotypes, an additional strong peak was noticeable in the crossed electrophoresis, which was not present in the trypsin-binding zones.
• Further, five Pi UU phenotypes showed only two trypsin-binding zones post starch gel electrophoresis, but three approximately equal-height peaks surfaced after crossed electrophoresis.

Supplemental Techniques and Results

• The same serum phenotypes were also subjected to agarose gel electrophoresis, where the Pi NN phenotypes showed two equal strength trypsin-binding zones corresponding to the peaks after crossed electrophoresis.
• The Pi UU phenotypes had one small peak in front of one large peak, analogous to the trypsin-binding zones, and the Pi LL phenotypes showed only one peak, aligning with one trypsin-binding zone on the agarose gel.

Moreover Analysis

• A third technique was brought into play to further characterize the Pi NN phenotype. However, the abstract does not provide further details about this technique and its results.