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[[Image:3bbn.jpg|left|200px]]
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{{STRUCTURE_3bbn|  PDB=3bbn  |  SCENE=  }}  
{{STRUCTURE_3bbn|  PDB=3bbn  |  SCENE=  }}  


'''Homology model for the Spinach chloroplast 30S subunit fitted to 9.4A cryo-EM map of the 70S chlororibosome.'''
===Homology model for the Spinach chloroplast 30S subunit fitted to 9.4A cryo-EM map of the 70S chlororibosome.===




==Overview==
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Protein synthesis in the chloroplast is carried out by chloroplast ribosomes (chloro-ribosome) and regulated in a light-dependent manner. Chloroplast or plastid ribosomal proteins (PRPs) generally are larger than their bacterial counterparts, and chloro-ribosomes contain additional plastid-specific ribosomal proteins (PSRPs); however, it is unclear to what extent these proteins play structural or regulatory roles during translation. We have obtained a three-dimensional cryo-EM map of the spinach 70S chloro-ribosome, revealing the overall structural organization to be similar to bacterial ribosomes. Fitting of the conserved portions of the x-ray crystallographic structure of the bacterial 70S ribosome into our cryo-EM map of the chloro-ribosome reveals the positions of PRP extensions and the locations of the PSRPs. Surprisingly, PSRP1 binds in the decoding region of the small (30S) ribosomal subunit, in a manner that would preclude the binding of messenger and transfer RNAs to the ribosome, suggesting that PSRP1 is a translation factor rather than a ribosomal protein. PSRP2 and PSRP3 appear to structurally compensate for missing segments of the 16S rRNA within the 30S subunit, whereas PSRP4 occupies a position buried within the head of the 30S subunit. One of the two PSRPs in the large (50S) ribosomal subunit lies near the tRNA exit site. Furthermore, we find a mass of density corresponding to chloro-ribosome recycling factor; domain II of this factor appears to interact with the flexible C-terminal domain of PSRP1. Our study provides evolutionary insights into the structural and functional roles that the PSRPs play during protein synthesis in chloroplasts.
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{{ABSTRACT_PUBMED_18042701}}


==About this Structure==
==About this Structure==
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[[Category: Small ribosomal subunit]]
[[Category: Small ribosomal subunit]]
[[Category: Spinach chloroplast ribosome]]
[[Category: Spinach chloroplast ribosome]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed May 14 11:30:54 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 21:10:59 2008''

Revision as of 18:11, 27 July 2008

File:3bbn.png

Template:STRUCTURE 3bbn

Homology model for the Spinach chloroplast 30S subunit fitted to 9.4A cryo-EM map of the 70S chlororibosome.

Template:ABSTRACT PUBMED 18042701

About this Structure

3BBN is a Protein complex structure of sequences from Arabidopsis thaliana, Cucumis sativus, Mesembryanthemum crystallinum, Oryza sativa and Spinacia oleracea. Full crystallographic information is available from OCA.

Reference

Cryo-EM study of the spinach chloroplast ribosome reveals the structural and functional roles of plastid-specific ribosomal proteins., Sharma MR, Wilson DN, Datta PP, Barat C, Schluenzen F, Fucini P, Agrawal RK, Proc Natl Acad Sci U S A. 2007 Dec 4;104(49):19315-20. Epub 2007 Nov 27. PMID:18042701

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