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Primary sequence of duck metallothionein
1Institute of Molecular Biology, Academia Sinica Nankang, Taipei, Taiwan, China.
Biochimica Et Biophysica Acta
|October 18, 1990
Summary
Domesticated ducks possess a single metallothionein protein, identical in amino acid sequence to chicken metallothionein. This finding highlights extreme conservation of stress-inducible proteins across divergent animal species.
Area of Science:
- Biochemistry
- Molecular Biology
- Evolutionary Biology
Background:
- Metallothioneins are crucial for heavy metal detoxification and homeostasis.
- Stress-inducible proteins play vital roles in cellular defense mechanisms.
- Understanding protein conservation across species provides insights into evolutionary pathways.
Purpose of the Study:
- To elucidate the amino acid sequence of metallothionein in domesticated ducks upon zinc induction.
- To compare the duck metallothionein sequence with known metallothioneins from other avian species.
- To investigate the evolutionary conservation of stress-inducible proteins.
Main Methods:
- Zinc induction in domesticated ducks.
- Peptide generation through selective proteinase digestion.
- Chemical sequencing of overlapping peptides.
- Mass spectrometry for sequence confirmation.
Main Results:
- A single metallothionein was identified in domesticated ducks following zinc induction.
- The complete amino acid sequence of duck metallothionein was determined.
- The duck metallothionein sequence was found to be identical to that of chicken metallothionein.
Conclusions:
- Domesticated ducks and chickens share an identical metallothionein gene product.
- This represents an example of extreme evolutionary conservation for a stress-inducible protein.
- The findings suggest a conserved functional role and regulatory mechanism for metallothionein in these avian species.