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Zhuang, Min; Calabrese, Matthew F.; Liu, Jiang; Waddell, M. Brett; Nourse, Amanda; Hammel, Michal; Miller, Darcie J.; Walden, Helen; Duda, David M.; Seyedin, Steven N.; Hoggard, Timothy; Harper, J. Wade; White, Kevin P.; Schulman, Brenda A.
Molecular cell, 10/2009, Letnik: 36, Številka: 1Journal Article
In the largest E3 ligase subfamily, Cul3 binds a BTB domain, and an associated protein-interaction domain such as MATH recruits substrates for ubiquitination. Here, we present biochemical and structural analyses of the MATH-BTB protein, SPOP. We define a SPOP-binding consensus (SBC) and determine structures revealing recognition of SBCs from the phosphatase Puc, the transcriptional regulator Ci, and the chromatin component MacroH2A. We identify a dimeric SPOP-Cul3 assembly involving a conserved helical structure C-terminal of BTB domains, which we call “3-box” due to its facilitating Cul3 binding and its resemblance to F-/SOCS-boxes in other cullin-based E3s. Structural flexibility between the substrate-binding MATH and Cul3-binding BTB/3-box domains potentially allows a SPOP dimer to engage multiple SBCs found within a single substrate, such as Puc. These studies provide a molecular understanding of how MATH-BTB proteins recruit substrates to Cul3 and how their dimerization and conformational variability may facilitate avid interactions with diverse substrates.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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