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The 26S proteasome, the central enzyme of the ubiquitin-proteasome system, is comprised of the 20S catalytic core particle (CP) and the 19S regulatory particle (RP), itself composed of two subcomplexes, the base and the lid. 20S proteasome assembly is assisted by several chaperones. Integral subunits of the RP participate in its assembly, but no external factors have been identified so far. Here we...
The 20S proteasome is the catalytic core of the 26S proteasome, a central enzyme in the ubiquitin-proteasome system. Its assembly proceeds in a multistep and orderly fashion. Ump1 is the only well-described chaperone dedicated to the assembly of the 20S proteasome in yeast. Here, we report a phenotype related to the DNA damage response that allowed us to isolate four other chaperones of yeast 20S...
Asf1 is a histone chaperone that favors histone H3/H4 assembly and disassembly. We solved the structure of the conserved domain of human ASF1A in complex with the C-terminal helix of histone H3 using nuclear magnetic resonance spectroscopy. This structure is fully compatible with an association of ASF1 with the heterodimeric form of histones H3/H4. In our model, ASF1 substitutes for the second H3/H4...
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