Article
Structure of AMP-PNP-bound vitamin B12 transporter BtuCD-F.
Nature - 18 Oct 2012
Korkhov Vladimir M, Mireku Samantha A, Locher Kaspar P
Abstract excerpt
The ATP-binding cassette (ABC) transporter BtuCD mediates the uptake of vitamin B(12) across the inner membrane of Escherichia coli. Previous structures have shown the conformations of apo states, but the transport mechanism has remained unclear. Here we report the 3.5 Å crystal structure of the transporter-binding protein complex BtuCD-BtuF (BtuCD-F) trapped in an β-γ-imidoadenosine 5'-phosphate (AMP-PNP)-bound...
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