Relationships between molecular interactions (nucleotides, lipids and proteins) and structural features of the bovine brain 21-kDa protein.
A cytosolic 21-kDa protein isolated from bovine brain was demonstrated to bind hydrophobic ligands, particularly phosphatidylethanolamine. It was encountered in several tissues and species; however, its accurate function remained partially unknown. In order to obtain information from its structural features, we built a molecular model which revealed it to possess a nucleotide-binding site. In the present research, we describe the affinity of the bovine brain 21-kDa protein for nucleotides, and its association with cytosolic proteins, small GTP-binding proteins and lipid droplets. Our results suggest that, through its association with small GTP-binding proteins, the 21-kDa protein is implicated in signal mechanisms during cell growth and maturation.
Laboratoire des proteines, CNRS URA 1188, Université René Descartes Paris 5, France.
S
S
Bucquoy
P
P
Jollès
F
F
Schoentgen
D000595:Amino Acid Sequence; D000818:Animals; D001921:Brain / Q000378:metabolism*; D002417:Cattle; D003600:Cytosol / Q000378:metabolism; D019204:GTP-Binding Proteins / Q000378:metabolism; D006801:Humans; D066298:In Vitro Techniques; D050356:Lipid Metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D015394:Molecular Structure; D008970:Molecular Weight; D009419:Nerve Tissue Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D009711:Nucleotides / Q000378:metabolism; D010714:Phosphatidylethanolamines / Q000378:metabolism; D011487:Protein Conformation; D051381:Rats; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction
D009419:Nerve Tissue Proteins; D009711:Nucleotides; D010714:Phosphatidylethanolamines; D019204:GTP-Binding Proteins