Molecular cloning of the cDNA encoding A + U-rich element RNA binding factor

Area of Science:

• Molecular Biology
• RNA Binding Proteins
• Gene Regulation

Background:

• A+U-rich elements (AREs) in mRNA are crucial regulators of gene expression, often controlling mRNA stability.
• RNA-binding proteins play key roles in post-transcriptional regulation by interacting with specific RNA sequences.
• Understanding the proteins that bind AREs is essential for deciphering mechanisms of mRNA decay and protein synthesis.

Purpose of the Study:

• To identify and characterize novel human RNA-binding proteins involved in the regulation of mRNA stability.
• To investigate the relationship between the structure and function of newly identified RNA-binding proteins.
• To explore the potential role of these proteins in the destabilization of specific mRNA targets.

Main Methods:

• Differential display technique was employed to isolate new cDNA clones.
• Sequence analysis of the isolated cDNA clone (laAUF1) and its encoded protein.
• Homology comparison of laAUF1 with known RNA-binding proteins, specifically AUF1.

Main Results:

• A novel human cDNA clone, laAUF1, encoding an A+U-rich RNA-binding motif was successfully isolated and sequenced.
• The deduced polypeptide sequence of laAUF1 showed 73% homology with human AUF1 in key functional regions.
• These regions include two RNA recognition motifs (RRMs) and a Gln-rich motif, critical for RNA binding.

Conclusions:

• The high homology suggests that laAUF1 is a functional homolog of AUF1.
• The similar binding affinities of laAUF1 and AUF1 for A+U-rich elements (AREs) are likely responsible for their potency as mRNA destabilizers.
• This finding contributes to the understanding of post-transcriptional regulation mediated by ARE-binding proteins.