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Allosteric control of the exportin CRM1 unraveled by crystal structure analysis.

(2014) FEBS J 281

PubMed: 24823279 | PubMedCentral: PMC4231977 | DOI: 10.1111/febs.12842

In addition to the relatively rigid and similar conformation of CRM1 in the various complexes, X-ray crystallography, electron microscopy (EM) and small angle X-ray scattering of free CRM1 provided ev... dence of the great conformational flexibility of this transport receptor (PDB IDs 4FGV, 3VYC, 4BSN, 4BSM; EMD-2110, 2111, 2274, 5564) 73 – 76 .

In the closed NES cleft of free CRM1 (H) (PDB ID 4FGV) the Φ-pockets are inaccessible due to a 2.8 Å movement of helices 11A and 12A towards each other.

Figure 6 Sequence conservation of CRM1 in the structural context of free CRM1 (PDB ID 4FGV).

The crystal structures of CRM1 in the ternary CRM1-RanGTP-SPN1 (PDB ID 3GJX) export complex and free CRM1 (PDB ID 4FGV) have been fitted into the toroidal and extended reconstruction, respectively.

Structure State Resolution PDB ID Space group Mol/au Structure completeness Reference Export complexes   Hs CRM1 Hs SPN1 Ran-free cargo complex 2.90 Å 3GB8 P 6 4 22 1 88% 51   Mm CRM1 Hs SPN1 Hs RanGTP Export complex 2.50 Å 3GJX P 2 1 2 98% 50   Mm CRM1 Hs SPN1-PKI Hs RanGTP PKI-NES (SPN1 chimera) 3.42 Å 3NBY P 2 1 2 97% 71   Mm CRM1 Hs SPN1-Rev Hs RanGTP Rev-NES (SPN1 chimera) 2.80 Å 2.90 Å 3NBZ 3NC0 P 2 1 P 2 1 2 2 97% 97%   Mm CRM1 Hs RanGTP Cargo-free Ran complex 3.35 Å 3NC1 C 222 1 1 96% Disassembly complex   Sc CRM1 Sc RanBP1 Sc RanGTP Disassembly complex (Δ377–413) 2.00 Å 1.80 Å 3M1I 4HB2 P 4 3 2 1 2 P 4 3 2 1 2 1 94% 98% 72 52 Inhibitors Sc CRM1 b Sc RanBP1 Sc RanGTP LMB bound (Δ377–413) 1.78 Å 1.90 Å 2.30 Å 2.05 Å 2.80 Å 1.90 Å 2.20 Å 4HAT 4HAW 4HAY 4HB4 4HB3 a 4HAZ 4HB0 P 4 3 2 1 2 P 4 3 2 1 2 P 4 3 2 1 2 P 4 3 2 1 2 P 4 3 2 1 2 P 4 3 2 1 2 P 4 3 2 1 2 1 1 1 1 1 1 1 97% 96% 97% 95% 95% 95% 95% 52 Anguinomycin B bound (Δ377–413) 2.00 Å 4HAV P 4 3 2 1 2 1 97% Ratjadone A bound (Δ377–413) 2.00 Å 2.28 Å 4HAU 4HAX P 4 3 2 1 2 P 4 3 2 1 2 1 1 97% 97% KPT185 bound (Δ377–413) 2.10 Å 4GMX P 4 3 2 1 2 1 97% 54 KPT251 bound (Δ377–413) 2.22 Å 4GPT P 4 3 2 1 2 1 96% 55 Free CRM1   Ct CRM1 Thermophilic CRM1 2.94 Å 3.10 Å 4FGV 4HZK P 2 1 2 1 2 1 P 3 1 1 2 99% 96% 74   Hs CRM1 C-terminal deletion (Δ1033–1071) 4.10 Å 4.50 Å 4BSN 4BSM C 222 1 C 222 1 1 1 63% 79% 76   Sc CRM1 (Δ377–413, Δ971–984) 2.10 Å 3VYC P 4 1 1 90% 75   Hs CRM1 HEAT helices 15A–21A (amino acids 707–1027) 2.30 Å 1W9C P 2 1 2 1 2 2 30% 70 a LMB in this crystal structure was weakly bound and thus not modeled.

Publication Year: 2014