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Monotopic membrane proteins are membrane proteins that interact with only one leaflet of the lipid bilayer and do not possess transmembrane spanning segments. They are endowed with important physiological functions but until now only few of them have been studied. Here we present a detailed biochemical, enzymatic and crystallographic characterization of the monotopic membrane protein sulfide:quinone...
The latest structure of the vitamin B12 permease reported in Science by Hvorup and colleagues represents an unexpected, asymmetric state of an ABC transporter, and indicates that the translocation cycle may be even more complex than previously thought (Hvorup et al., 2007).
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