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The spectrin phosphorylation reaction in human erythrocytes
Progress in Clinical and Biological Research
|January 1, 1978
Summary
Spectrin phosphorylation in whole cells is specific, occurring on one peptide. However, it is less specific in extracts, and diamide inhibits spectrin kinase and cell shape restoration.
Area of Science:
- Biochemistry
- Cell Biology
- Erythrocyte research
Background:
- Spectrin phosphorylation is a key post-translational modification affecting cell structure.
- Understanding the specificity of spectrin phosphorylation is crucial for cell biology.
- Erythrocyte morphology is maintained by spectrin cytoskeleton.
Purpose of the Study:
- To investigate the specificity of spectrin phosphorylation in different cellular contexts.
- To identify inhibitors of spectrin phosphorylation and related cellular processes.
- To explore the role of spectrin phosphorylation in maintaining erythrocyte shape.
Main Methods:
- Analysis of spectrin phosphorylation sites using tryptic peptide mapping.
- Comparison of phosphorylation in whole cells versus soluble extracts and isolated membranes.
- Assay of diamide as an inhibitor of spectrin kinase, casein kinase, and erythrocyte morphology restoration.
Main Results:
- Phosphorylation of spectrin in whole cells is highly specific, occurring on a single tryptic peptide.
- Spectrin phosphorylation in soluble extracts and isolated membranes exhibits reduced specificity.
- Diamide effectively inhibits erythrocyte spectrin kinase and casein kinase.
- Diamide also prevents the restoration of biconcave shape in depleted erythrocytes.
Conclusions:
- Whole cell spectrin phosphorylation represents a specific modification.
- In vitro systems (extracts, membranes) show less specific spectrin phosphorylation.
- Diamide is a potent inhibitor of key kinases involved in spectrin modification and erythrocyte shape maintenance.