Yeast pyruvate carboxylase: gene isolation.

Area of Science:

• Biochemistry
• Molecular Biology
• Enzymology

Background:

• Pyruvate carboxylase (PC) is a key enzyme in metabolism.
• Biotin-dependent carboxylases share structural and functional similarities.
• Understanding PC's structure aids in studying enzyme evolution.

Purpose of the Study:

• To isolate and sequence the Saccharomyces cerevisiae gene encoding pyruvate carboxylase (PC).
• To investigate the evolutionary relationships of biotin-dependent carboxylases.
• To compare the yeast PC sequence with other known carboxylases.

Main Methods:

• Genomic DNA isolation and sequencing from Saccharomyces cerevisiae.
• Protein sequence analysis and homology comparison.
• Confirmation of gene identity via peptide sequencing.

Main Results:

• A yeast genomic DNA fragment encoding PC was successfully isolated and sequenced.
• The encoded yeast PC protein showed 43% amino acid homology with rat PC.
• A variation in biotinylation site proximity to the carboxyl-terminus was observed in yeast PC compared to other biotin carboxylases.

Conclusions:

• The study provides insights into the structure and evolution of pyruvate carboxylase.
• The findings contribute to the understanding of biotin-dependent carboxylase family.
• Sequence homology suggests conserved functions but variations indicate evolutionary divergence.