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Enolase: human tissue distribution and evidence for three different loci
Annals of Human Genetics
|January 1, 1976
Summary
Human enolase exists in different forms across tissues, suggesting a dimeric structure formed by two polypeptide chains from the ENO1 and ENO2 genes. Muscle tissue indicates a third gene locus, ENO3.
Area of Science:
- Biochemistry
- Human Genetics
- Enzymology
Background:
- Enolase is a crucial enzyme in glycolysis.
- Isoforms of enolase have been observed in various human tissues.
- Understanding enolase heterogeneity is important for cellular function studies.
Purpose of the Study:
- To characterize the electrophoretic patterns of human enolase in different tissue extracts.
- To investigate the molecular basis of enolase heterogeneity.
- To explore the genetic loci involved in human enolase synthesis.
Main Methods:
- Cellogel electrophoresis was employed to analyze enolase patterns.
- Human tissue extracts from various organs were examined.
- Dissociation and recombination experiments were conducted.
Main Results:
- Four distinct cellogel electrophoretic patterns of enolase were identified across human tissues.
- Haemolysates, white cells, skin fibroblasts, and kidney extracts showed a three-banded pattern (I, II, III).
- Brain tissue exhibited a similar pattern with higher concentrations of bands II and III, while liver, heart, intestine, spleen, and placenta showed a single band (I).
- Adult muscle extracts displayed a unique band with faster mobility than band I.
- Analysis of a heterozygous ENO1/ENO2 genotype revealed complex banding, supporting a dimeric structure formed by alpha and beta chains.
- Electrophoretic data from muscle tissue provided evidence for a third enolase gene locus, ENO3.
Conclusions:
- Human enolase exists as a dimer composed of polypeptide subunits encoded by at least two, and likely three, independent gene loci (ENO1, ENO2, and ENO3).
- Tissue-specific expression patterns of these subunits contribute to the observed electrophoretic heterogeneity of enolase.
- The findings elucidate the genetic basis and molecular structure of human enolase isoforms.
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