Related Experiment Videos
[Multiple molecular forms of erythrocyte carbonic anhydrase of sheep (author's transl)]
Insights
Researchers identified four forms of ovine erythrocyte carbonic anhydrase, including major types CI, CII, and CX, and minor type CI1v. These isoenzymes differ structurally, with CI1v being a modified CI and CX a CI-glutathione complex.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Context:
- Carbonic anhydrase is crucial for physiological processes.
- Ovine erythrocytes are a model for studying enzyme isoforms.
- Previous research identified multiple carbonic anhydrase forms.
Purpose:
- To identify and characterize carbonic anhydrase forms in ovine erythrocytes.
- To elucidate the structural relationships between these enzyme isoforms.
Summary:
- Electrophoresis and isoelectrofocusing identified three major (CI, CII, CX) and one minor (CI1v) ovine erythrocyte carbonic anhydrase forms.
- Chromatography on DEAE-Sephadex A-50 enabled the isolation of these four forms.
- Comparative analysis revealed CI1v as a modified CI, CX as CI complexed with glutathione, and CI/CII as isoenzymes differing by a single amino acid substitution (Lys to Thr).
Impact:
- Provides detailed structural insights into ovine carbonic anhydrase heterogeneity.
- Contributes to understanding enzyme diversity and function in erythrocytes.
- Establishes a basis for further functional and evolutionary studies of carbonic anhydrase.
Abstract:
Three major forms CI, CII and CX and the minor component CI1v of ovine erythrocyte carbonic anhydrase have been identified in the ethanol chloroform extract of the hemolysate by electrophoresis on cellulose acetate and isoelectrofocusing. Isolation of the four forms was achieved by chromatography on DEAE-Sephadex A-50. Comparative studies suggest that: (1) form CI1v is a modified form of CI, (2) form CX is CI plus glutathione and (3) forms CI and CII are isoenzymes which differ in their primary structure by one Lys leads to Thr substitution 35 residues from the N-acetylated terminus.