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Cloning, characterization and sequence comparison of the gene coding for IMP dehydrogenase from Pyrococcus furiosus
F R Collart1, J Osipiuk, J Trent
1Center for Mechanistic Biology and Biotechnology, Argonne National Laboratory, IL 60439, USA.
Gene
|October 3, 1996
Summary
Researchers cloned and characterized the inosine monophosphate dehydrogenase (IMPDH) gene from Pyrococcus furiosus. Phylogenetic analysis revealed its similarity to bacterial IMPDH and evolutionary insights into mammalian IMPDH isoforms.
Area of Science:
- Biochemistry
- Molecular Biology
- Genomics
Background:
- Inosine monophosphate dehydrogenase (IMPDH) is a critical enzyme in purine biosynthesis.
- Understanding IMPDH evolution provides insights into enzyme function and diversity across domains of life.
Purpose of the Study:
- To clone and characterize the gene encoding IMPDH from the hyperthermophilic archaeon Pyrococcus furiosus (Pf).
- To investigate the phylogenetic relationships of Pf IMPDH with other IMPDH sequences.
Main Methods:
- Gene cloning and sequencing of IMPDH from Pyrococcus furiosus.
- Bioinformatic analysis including sequence alignment and phylogenetic tree construction.
- Identification of promoter elements and active-site motifs.
Main Results:
- The Pf IMPDH gene encodes a 485-amino acid protein with a calculated molecular weight of 52,900.
- Canonical Archaea promoter elements (Box A and Box B) were identified upstream of the start codon.
- Phylogenetic analysis showed Pf IMPDH is closely related to bacterial IMPDH, suggesting horizontal gene transfer or ancient divergence.
- The analysis also supported a gene duplication event leading to mammalian IMPDH Type I and II isoforms.
Conclusions:
- The characterization of Pf IMPDH provides a new model for studying hyperthermophilic IMPDH.
- Phylogenetic findings contribute to understanding the evolutionary history of IMPDH and the origins of mammalian isoforms.