1IQ4

5S-RRNA BINDING RIBOSOMAL PROTEIN L5 FROM BACILLUS STEAROTHERMOPHILUS

1IQ4 の概要

• エントリーDOI: 10.2210/pdb1iq4/pdb
• 分子名称: 50S RIBOSOMAL PROTEIN L5 (2 entities in total)
• 機能のキーワード: ribosomal protein, rrna-binding, rnp motif, rna binding protein
• 由来する生物種: Geobacillus stearothermophilus
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 40353.43

構造登録者

Nakashima, T.,Yao, M.,Kawamura, S.,Iwasaki, K.,Kimura, M.,Tanaka, I. (登録日: 2001-06-13, 公開日: 2001-06-27, 最終更新日: 2023-12-27)

主引用文献

Nakashima, T.,Yao, M.,Kawamura, S.,Iwasaki, K.,Kimura, M.,Tanaka, I.
Ribosomal protein L5 has a highly twisted concave surface and flexible arms responsible for rRNA binding.
RNA, 7:692-701, 2001

PubMed Abstract: Ribosomal protein L5 is a 5S rRNA binding protein in the large subunit and plays an essential role in the promotion of a particular conformation of 5S rRNA. The crystal structure of the ribosomal protein L5 from Bacillus stearothermophilus has been determined at 1.8 A resolution. The molecule consists of a five-stranded antiparallel beta-sheet and four alpha-helices, which fold in a way that is topologically similar to the ribonucleoprotein (RNP) domain. The molecular shape and electrostatic representation suggest that the concave surface and loop regions are involved in 5S rRNA binding. To identify amino acid residues responsible for 5S rRNA binding, we made use of Ala-scanning mutagenesis of evolutionarily conserved amino acids occurring in the beta-strands and loop regions. The mutations of Asn37 at the beta1-strand and Gln63 at the loop between helix 2 and beta3-strand as well as that of Phe77 at the tip of the loop structure between the beta2- and beta3-strands caused a significant reduction in 5S rRNA binding. In addition, the mutations of Thr90 on the beta3-strand and Ile141 and Asp144 at the loop between beta4- and beta5-strands moderately reduced the 5S rRNA-binding affinity. Comparison of these results with the more recently analyzed structure of the 50S subunit from Haloarcula marismortui suggests that there are significant differences in the structure at N- and C-terminal regions and probably in the 5S rRNA binding.

PubMed: 11350033
DOI: 10.1017/S1355838201002345

実験手法

X-RAY DIFFRACTION (1.8 Å)