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Figure 5
The RNA subsystem of the PA-Sm1 complex has the same architecture as the binding protein. The RNA envelope has a radius [r'_{\rm e}] scaled by the heptagrammal factor μ = 0.8629 with respect to re, as is the unit length u′ with respect to u. There are two binding sites. The outer one, with radius [r'_{\rm e}] = 8u′, occupies the enlarged space between the two heptameric rings. The inner binding site has radius [r''_{\rm e}] and a central hole in a heptagrammal scaling relation with the envelope. The remaining structural parameters are multiples of u′, as indicated.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 61| Part 3| February 2005| Pages 269-277
doi:10.1107/S0907444904032718
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