Isolation and characterization of horse alpha 2-macroglobulin protease inhibitor.

This research article revolves around the extraction and analysis of horse alpha 2-macroglobulin (alpha 2M), a protease inhibitor, and comparing its properties with human alpha 2M. The researchers found considerable similarities in the two, including molecular weight, isoelectrofocusing pattern, change in electrophoretic mobility due to interaction with protease, and immunochemical relatedness.

Isolation of Horse Alpha 2-Macroglobulin

• The researchers used conventional methods to isolate alpha 2M from the horse. These methods included affinity chromatography, ion exchange chromatography, and gel filtration. Such techniques helped isolate the protein and purify it sufficiently for further examinations.

Characterization and Comparison with Human Alpha 2-Macroglobulin

• Post-isolation, the properties of horse alpha 2M were studied and compared with those of human alpha 2M. Inter-case comparisons were made in the context of molecular weight, the isoelectrofocusing pattern, and the alterations in electrophoretic mobility when interacting with a protease.
• The molecular weight of the native protein and its subunits was found to be analogous to that of human alpha 2M. Similarly, the isoelectrofocusing pattern, which refers to the distribution of different forms of a protein or molecules based on their different isoelectric points, seemed almost the same for both horse and human alpha 2M.
• The change in electrophoretic mobility due to interaction with the protease was also identical in both the horse and human alpha 2M. Electrophoretic mobility is essentially the movement of charged particles in a fluid when subjected to an electric field. The similar change indicates a consistent outcome of the interaction with protease.

Enzyme Specificity and Immunochemical Relatedness

• Other findings of the study indicated that horse alpha 2M possesses broad enzyme specificity. It was observed to inhibit enzymatic action on large molecules or macromolecules. However, it did not affect small molecular weight synthetic substrates.
• The researchers also studied the immunochemical relation between horse and human alpha 2M when examined by specific antisera to human as well as to horse alpha 2M. The analysis led to the conclusion that the two are immunochemically related, despite their different sources.