Download MendeleySolution structure of a SRP19 binding domain in human SRP RNA.
Sakamoto, T., Morita, S., Tabata, K., Nakamura, K., Kawai, G.(2002) J Biochem 132: 177-182
- PubMed: 12153712
- DOI: https://doi.org/10.1093/oxfordjournals.jbchem.a003207
- Primary Citation of Related Structures:
1L1W - PubMed Abstract:
Assembly of the human signal recognition particle (SRP) requires SRP19 protein to bind to helices 6 and 8 of SRP RNA. In the present study, structure of a 29-mer RNA composing the SRP19 binding site in helix 6 was determined by NMR spectroscopy. The two A:C mismatches were continuously stacked to each other and formed wobble type A:C base pairs. The GGAG tetraloop in helix 6 was found to adopt a similar conformation to that of GNRA tetraloop, suggesting that these tetraloops are included in an extensive new motif GNRR. Compared with the crystal structure of helix 6 in complex with SRP19 determined previously, the GGAG tetraloop in the complex was found to adopt a similar conformation to the free form, although the loop structure becomes more open upon SRP19 binding. Thus, SRP19 is thought to recognize the overall fold of the GGAG loop.
- Department of Industrial Chemistry, Faculty of Engineering, Chiba Institute of Technology, Narashino, Chiba 275-0016, Japan.
Organizational Affiliation:
