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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Architecture of CRM1/Exportin1 suggests how cooperativity is achieved during formation of a nuclear export complex.

CRM1/Exportin1 mediates the nuclear export of proteins bearing a leucine-rich nuclear export signal (NES) by forming a cooperative ternary complex with the NES-bearing substrate and the small GTPase Ran. We present a structural model of human CRM1 based on a combination of X-ray crystallography, homology modeling, and electron microscopy. The architecture of CRM1 resembles that of the import receptor transportin1, with 19 HEAT repeats and a large loop implicated in Ran binding. Residues critical for NES recognition are identified adjacent to the cysteine residue targeted by leptomycin B (LMB), a specific CRM1 inhibitor. We present evidence that a conformational change of the Ran binding loop accounts for the cooperativity of Ran- and substrate binding and for the selective enhancement of CRM1- mediated export by the cofactor RanBP3. Our findings indicate that a single architectural and mechanistic framework can explain the divergent effects of RanGTP on substrate binding by many import and export receptors.[1]

References

  1. Architecture of CRM1/Exportin1 suggests how cooperativity is achieved during formation of a nuclear export complex. Petosa, C., Schoehn, G., Askjaer, P., Bauer, U., Moulin, M., Steuerwald, U., Soler-López, M., Baudin, F., Mattaj, I.W., Müller, C.W. Mol. Cell (2004) [Pubmed]
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