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(A) E4B U-box and UbcH5c interface showing possible salt bridges and hydrogen bonds.
(B) E4B U-box and UbcH5c interface showing how F62 and S94-P95-A96 (S-P-A motif) of UbcH5c interact with E4B U-box.
(C) E4B U-box and UbcH5c interface illustrating how L1236 and M1237 of E4B U-box interact with UbcH5c. See also Figure S3 for the electron density map of the E4B U-box–UbcH5c complex.
