The alpha-helix of the second chromodomain of the 43 kDa subunit of the chloroplast signal recognition particle facilitates binding to the 54 kDa subunit - PubMed (original) (raw)
. 2006 May 29;580(13):3107-11.
doi: 10.1016/j.febslet.2006.04.055. Epub 2006 Apr 27.
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- PMID: 16678173
- DOI: 10.1016/j.febslet.2006.04.055
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The alpha-helix of the second chromodomain of the 43 kDa subunit of the chloroplast signal recognition particle facilitates binding to the 54 kDa subunit
Rebecca Hermkes et al. FEBS Lett. 2006.
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Abstract
Chloroplasts of higher plants contain a unique signal recognition particle (cpSRP) that consists of two proteins, cpSRP54 and cpSRP43. CpSRP43 is composed of a four ankyrin repeat domain and three functionally distinct chromodomains (CDs). In this report we confirm previously published data that the second chromodomain (CD2) provides the primary binding site for cpSRP54. However, quantitative binding analysis demonstrates that cpSRP54 binds to CD2 significantly less efficiently than it binds to full-length cpSRP43. Further analysis of the binding interface of cpSRP by mutagenesis studies and a pepscan approach demonstrates that the C-terminal alpha-helix of CD2 facilitates binding to cpSRP54.
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