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A non-canonical UBA-UBL interaction forms the linear-ubiquitin-chain assembly complex.

ABSTRACT: HOIL-1L and its binding partner HOIP are essential components of the E3-ligase complex that generates linear ubiquitin (Ub) chains, which are critical regulators of NF-?B activation. Using crystallographic and mutational approaches, we characterize the unexpected structural basis for the specific interaction between the Ub-like domain (UBL) of HOIL-1L and the Ub-associated domain (UBA) of HOIP. Our data indicate the functional significance of this non-canonical mode of UBA-UBL interaction in E3 complex formation and subsequent NF-?B activation. This study highlights the versatility and specificity of protein-protein interactions involving Ub/UBLs and their cognate proteins.

SUBMITTER: Yagi H 

PROVIDER: S-EPMC3343348 | biostudies-literature | 2012 May

REPOSITORIES: biostudies-literature

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HOIL-1L and its binding partner HOIP are essential components of the E3-ligase complex that generates linear ubiquitin (Ub) chains, which are critical regulators of NF-κB activation. Using crystallographic and mutational approaches, we characterize the unexpected structural basis for the specific interaction between the Ub-like domain (UBL) of HOIL-1L and the Ub-associated domain (UBA) of HOIP. Our data indicate the functional significance of this non-canonical mode of UBA-UBL interaction in E3  ...[more]

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