Mapping the Signal Sequence-binding Site on SRP Reveals a Significant Role for the NG Domain *
Journal of Biological Chemistry, ISSN: 0021-9258, Vol: 277, Issue: 48, Page: 46763-46768
2002
- 26Citations
- 25Captures
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Metrics Details
- Citations26
- Citation Indexes26
- 26
- CrossRef22
- Captures25
- Readers25
- 25
Article Description
We present evidence that the signal recognition particle (SRP) recognizes signal sequences via the NG domain on the SRP54 protein subunit. Using a recently developed cross-linking method (Fancy, D. A., and Kodadek, T. (1999) Proc. Natl. Acad. Sci. U. S. A. 96, 6020–6024; Correction (1999) Proc. Natl. Acad. Sci. U. S. A. 96, 1317), we find that signal peptides cross-link to the Escherichia coli SRP protein Ffh (the homologue of the mammalian SRP54 subunit) via the NG domain. Within the NG domain, the cross-linking site maps to the ras-like C-terminal subdomain termed the G domain. This result stands in contrast to previous studies, which concluded based on nascent chain cross-linking that the signal sequence bound to the adjacent M domain. As independent evidence of a direct binding interaction between the NG domain and the signal sequence, we find that the NG domain of Ffh binds signal peptides as an isolated entity. Our results suggest that the NG domain forms a substantial part of the binding site for the signal sequence.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0021925819332958; http://dx.doi.org/10.1074/jbc.m207427200; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0037195855&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/12244111; http://www.jbc.org/lookup/doi/10.1074/jbc.M207427200; https://syndication.highwire.org/content/doi/10.1074/jbc.M207427200; https://linkinghub.elsevier.com/retrieve/pii/S0021925819332958; https://dx.doi.org/10.1074/jbc.m207427200
American Society for Biochemistry & Molecular Biology (ASBMB)
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