Ribosome-associated protein LBP/p40 binds to S21 protein of 40S ribosome: analysis using a yeast two-hybrid system.
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Sato M, Saeki Y, Tanaka K, Kaneda Y
Ribosome-associated protein LBP/p40 binds to S21 protein of 40S ribosome: analysis using a yeast two-hybrid system.
Biochem Biophys Res Commun. 1999 Mar 16;256(2):385-90.
- PubMed ID
- 10079194 [ View in PubMed]
- Abstract
The ribosome-associated protein LBP/p40, which was originally named after "laminin binding protein precursor p40," is distributed on the cell surface as laminin binding protein p67 (LBP/p67), in the nucleus, and on 40S ribosomes. In a broad range of eukaryotes, the localization of LBP/p40 on the 40S ribosome is well conserved. Two yeast homologs of LBP/p40 are believed to be essential for cell viability and each gene product probably corresponds to the assembly and/or stability of the 40S ribosomal subunit. The precise role of LBP/p40 in translation, however, remains to be elucidated, especially in higher eukaryotes. In this report, we used a yeast two-hybrid screening method to isolate molecules associated with human LBP/p40 protein on ribosomes. We found that the 40S ribosomal protein S21 was tightly bound with LBP/p40 in this yeast two-hybrid system and in in vitro analysis. Further, we discovered that the association required a broad region of the LBP/p40 amino acid sequence, which corresponds to the highly conserved region of LBP/p40 homologs among eukaryotes.