Survey on the PABC recognition motif PAM2

Area of Science:

• Molecular Biology
• Protein Interactions
• Bioinformatics

Background:

• The PABP-interacting motif 2 (PAM2) is a key binding site for the PABC domain in eukaryotic proteins.
• This domain is found in homologs of poly(A)-binding protein (PABP) and ubiquitin-protein ligase HYD.
• A comprehensive analysis of PAM2 motif occurrence across proteins was previously lacking.

Purpose of the Study:

• To conduct a comprehensive analysis of the PAM2 motif's occurrence in various proteins.
• To identify novel proteins containing the PAM2 motif and explore their functional contexts.
• To provide insights into the roles of PAM2-containing proteins and guide future research.

Main Methods:

• Iterated sequence profile searches were employed to identify proteins with the PAM2 motif.
• Analysis of domain architecture and functional context of identified PAM2-containing proteins.
• Comparison with known PAM2-containing protein families.

Main Results:

• An extensive list of eukaryotic proteins containing the PAM2 motif was generated.
• Identified proteins include homologs of eRF3, GSPT1/2, PAIP1/2, Tob1/2, Ataxin-2, and others.
• The PAM2 motif was consistently found outside globular protein domains, often alongside RNA-binding domains.

Conclusions:

• The comprehensive identification of PAM2 motif proteins offers valuable insights into their cellular functions and interaction partners.
• This resource facilitates further experimental investigation into uncharacterized proteins.
• The exclusive occurrence of PAM2 outside globular domains suggests specific structural or functional constraints.