Journal
STRUCTURE
Volume 24, Issue 3, Pages 423-436Publisher
CELL PRESS
DOI: 10.1016/j.str.2016.01.007
Keywords
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Funding
- NSF postdoctoral award
- NIH R01 grants [GM065334, GM021248, GM084396]
- NSF [DBI1040158, DMR-0944772, CHE-1265821]
- NIH [1S10OD012254]
- EPSRC [EP/K039121/1]
- Shimadzu instrumentation award
- Engineering and Physical Sciences Research Council [EP/K039121/1] Funding Source: researchfish
- EPSRC [EP/K039121/1] Funding Source: UKRI
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1265821] Funding Source: National Science Foundation
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Polyubiquitination, a critical protein post-translational modification, signals for a diverse set of cellular events via the different isopeptide linkages formed between the C terminus of one ubiquitin (Ub) and the epsilon-amine of K6, K11, K27, K29, K33, K48, or K63 of a second Ub. We assembled di-ubiquitins (Ub(2)) comprising every lysine linkage and examined them biochemically and structurally. Of these, K27-Ub(2) is unique as it is not cleaved by most deubiquitinases. As this remains the only structurally uncharacterized lysine linkage, we comprehensively examined the structures and dynamics of K27-Ub(2) using nuclear magnetic resonance, small-angle neutron scattering, and in silico ensemble modeling. Our structural data provide insights into the functional properties of K27-Ub(2), in particular that K27-Ub(2) may be specifically recognized by K48-selective receptor UBA2 domain from proteasomal shuttle protein hHR23a. Binding studies and mutagenesis confirmed this prediction, further highlighting structural/recognition versatility of polyubiquitins and the potential power of determining function from elucidation of conformational ensembles.
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