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. 2007 Aug 7;5(8):e209. doi: 10.1371/journal.pbio.0050209

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© 2007 Manuell et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Solvent-exposed face of the small subunit is shown slightly turned to look at the mRNA entrance channel.

(A) cuβ (blue) connects the beak helix with the head, squaring out this normally pointed feature on the ribosome, and approaches the top of the mRNA entrance channel. Connection to the shoulder stems from this chloroplast-unique structure as well.

(B) PSRP-7 antibody-labeled chloroplast ribosome structure has additional density near the mRNA entrance channel (cuδ) and extending from the beak helix toward the factor-binding site (cuɛ).

(C) Stereo pair image (putative PSRP-7 density labeled in purple) shows the position of cuδ across the mRNA entrance channel and paralleling cuα off the solvent-exposed face of the small subunit.