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-Structure paper
タイトル | Structural basis of substrate recognition and thermal protection by a small heat shock protein. |
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ジャーナル・号・ページ | Nat Commun, Vol. 12, Issue 1, Page 3007, Year 2021 |
掲載日 | 2021年5月21日 |
著者 | Chuanyang Yu / Stephen King Pong Leung / Wenxin Zhang / Louis Tung Faat Lai / Ying Ki Chan / Man Chit Wong / Samir Benlekbir / Yong Cui / Liwen Jiang / Wilson Chun Yu Lau / |
PubMed 要旨 | Small heat shock proteins (sHsps) bind unfolding proteins, thereby playing a pivotal role in the maintenance of proteostasis in virtually all living organisms. Structural elucidation of sHsp- ...Small heat shock proteins (sHsps) bind unfolding proteins, thereby playing a pivotal role in the maintenance of proteostasis in virtually all living organisms. Structural elucidation of sHsp-substrate complexes has been hampered by the transient and heterogeneous nature of their interactions, and the precise mechanisms underlying substrate recognition, promiscuity, and chaperone activity of sHsps remain unclear. Here we show the formation of a stable complex between Arabidopsis thaliana plastid sHsp, Hsp21, and its natural substrate 1-deoxy-D-xylulose 5-phosphate synthase (DXPS) under heat stress, and report cryo-electron microscopy structures of Hsp21, DXPS and Hsp21-DXPS complex at near-atomic resolution. Monomeric Hsp21 binds across the dimer interface of DXPS and engages in multivalent interactions by recognizing highly dynamic structural elements in DXPS. Hsp21 partly unfolds its central α-crystallin domain to facilitate binding of DXPS, which preserves a native-like structure. This mode of interaction suggests a mechanism of sHsps anti-aggregation activity towards a broad range of substrates. |
リンク | Nat Commun / PubMed:34021140 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.7 - 4.6 Å |
構造データ | EMDB-30261, PDB-7bzw: EMDB-30262, PDB-7bzx: EMDB-30263, PDB-7bzy: |
由来 |
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キーワード | CHAPERONE / small heat shock protein / TRANSFERASE / 1-deoxy-D-xylulose 5-phosphate synthase / PLANT PROTEIN / TRANSFERASE/CHAPERONE / Hsp21-DXPS / TRANSFERASE-CHAPERONE complex |