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Multiple molecular forms of Acanthamoeba lactic dehydrogenase.
1School of Science, Humberside College of Higher Education, UK.
Summary
Acanthamoeba lactic dehydrogenase (LDH) exists as a single form in trophozoites but exhibits multiple species upon closer examination. This suggests genetic encoding for multiple LDH isoenzymes.
Area of Science:
- Biochemistry
- Molecular Biology
- Parasitology
Background:
- Lactic dehydrogenase (LDH) is a crucial enzyme in cellular metabolism.
- Understanding enzyme isoforms is vital for studying organismal physiology and genetics.
- Acanthamoeba species are significant protozoan pathogens.
Purpose of the Study:
- To investigate the molecular forms of Acanthamoeba lactic dehydrogenase (LDH).
- To determine the subunit composition and genetic basis of LDH isoenzymes in Acanthamoeba.
Main Methods:
- Polyacrylamide gel electrophoresis (PAGE) was used to assess macromolecular forms.
- Isoelectric focusing (PAGIEF) was employed to resolve enzyme species.
- Molecular weight determination was performed to ascertain subunit assembly.
Main Results:
- PAGE revealed a single macromolecular form of LDH in Acanthamoeba trophozoites.
- PAGIEF demonstrated the presence of at least three distinct LDH species (isoenzymes).
- Molecular weight data indicated that Acanthamoeba LDH is a tetrameric enzyme.
Conclusions:
- Acanthamoeba LDH exists as multiple isoenzymes, not apparent by PAGE alone.
- The presence of multiple LDH isoenzymes suggests genetic heterogeneity.
- These isoenzymes are likely encoded by genes at two loci or multiple alleles at a single locus.