C-Terminal End-Directed Protein Elimination by CRL2 Ubiquitin Ligases.

C-Terminal End-Directed Protein Elimination by CRL2 Ubiquitin Ligases.
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DOI:
10.1016/j.molcel.2018.04.006
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发表时间:
2018-05-17
期刊:
影响因子:
16
通讯作者:
Yen HS
Yen HS
中科院分区:
生物学1区
文献类型:
--
作者:
Lin HC;Yeh CW;Chen YF;Lee TT;Hsieh PY;Rusnac DV;Lin SY;Elledge SJ;Zheng N;Yen HS

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The proteolysis-assisted protein quality control system guards the proteome from potentially detrimental aberrant proteins. How miscellaneous defective proteins are specifically eliminated and which molecular characteristics direct them for removal are fundamental questions. We reveal a mechanism, DesCEND (Destruction via the C-END), by which CRL2 ubiquitin ligase uses interchangeable substrate receptors to recognize the unusual C-termini of abnormal proteins, i.e. C-end degrons. C-end degrons are mostly less than ten residues in length and comprise a few indispensable residues along with some rather degenerate ones. The C-terminal end-position is essential for C-end degron function. Truncated selenoproteins generated by translation errors and the USP1 N-terminal fragment from post-translational cleavage are eliminated by DesCEND. DesCEND also targets full-length proteins with naturally-occurring C-end degrons. The C-end degron in DesCEND echoes the N-end degron in the N-end rule pathway, highlighting the dominance of protein “ends” as indicators for protein elimination.
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