Signature sequences for the galectin-4 subfamily

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Galectins are a family of animal lectins characterized by their beta-galactoside binding affinity and conserved amino acid sequences.
• Understanding the structure and evolutionary relationships of galectins is crucial for elucidating their diverse biological functions.

Purpose of the Study:

• To clone and sequence the cDNA encoding rabbit bladder galectin-4.
• To analyze the deduced amino acid sequence and predict the protein's structure.
• To identify conserved sequence motifs within galectin-4 and related proteins for subfamily identification.

Main Methods:

• Cloning and sequencing of rabbit bladder galectin-4 cDNA (GenBank accession no. AF091738).
• Deduction of the amino acid sequence and prediction of protein structure (N-terminal peptide, linker region, two carbohydrate recognition domains).
• Comparative sequence analysis of rabbit galectin-4 with homologous proteins from human, pig, rat, mouse, and mouse galectin-6.

Main Results:

• The deduced 328 amino acid sequence of rabbit galectin-4 exhibits a multidomain structure.
• Two highly conserved peptide motifs were identified: one in the N-terminus and one in the first carbohydrate recognition domain.
• These motifs are conserved across multiple mammalian species, including human, pig, rat, and mouse galectin-4, as well as mouse galectin-6.

Conclusions:

• The identified conserved peptide motifs serve as potential signature sequences for the galectin-4 subfamily.
• This finding aids in the identification of novel galectin-4 subfamily members and enhances understanding of galectin evolution.
• The structural insights into rabbit galectin-4 contribute to the broader study of galectin family diversity and function.