SCL binds the human homologue of DRG in vivo

Area of Science:

• Molecular Biology
• Oncology
• Genetics

Background:

• The human development regulated GTP-binding protein (DRG) is a suspected oncoprotein.
• Homologues of human DRG exist in various species, including mouse, Xenopus, Drosophila, yeast, and Halobacteria.
• The precise role and identification of human DRG have remained elusive.

Purpose of the Study:

• To identify and clone the human homologue of the development regulated GTP-binding protein (DRG).
• To characterize the cloned human DRG and compare it with its mouse counterpart.
• To validate the cloned sequence as the bona fide human DRG.

Main Methods:

• Yeast two-hybrid system was employed to search for SCL binding partners.
• Isolation of two independent cDNA clones (L51 and V3) from human fetal liver and thymus cDNA libraries.
• Amino acid sequence comparison between the cloned human DRG and mouse DRG.

Main Results:

• Two independent cDNA clones representing the human DRG homologue were successfully isolated.
• The cloned human DRG exhibited high primary amino acid structure conservation with mouse DRG.
• Only a single amino acid difference was noted between the human and mouse DRG proteins.

Conclusions:

• The study successfully identified and cloned the bona fide human development regulated GTP-binding protein (DRG).
• The high degree of conservation suggests a critical and conserved biological function for DRG across species.
• This finding establishes human DRG as a significant target for future oncogenic and developmental studies.