論文

査読有り
2011年6月

Crystallographic Snapshots of Tom20-Mitochondrial Presequence Interactions with Disulfide-Stabilized Peptides

BIOCHEMISTRY
  • Takashi Saitoh
  • ,
  • Mayumi Igura
  • ,
  • Yusuke Miyazaki
  • ,
  • Toyoyuki Ose
  • ,
  • Nobuo Maita
  • ,
  • Daisuke Kohda

50
24
開始ページ
5487
終了ページ
5496
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1021/bi200470x
出版者・発行元
AMER CHEMICAL SOC

Most mitochondrial proteins are synthesized in the cytosol and imported into mitochondria. The Tom20 protein, residing on the mitochondrial surface, recognizes the N-terminal presequences of precursor proteins. We previously determined the crystal structures of the Tom20 presequence complex. The successful crystallization involved tethering the presequence to Tom20 through an intermolecular disulfide bond with an optimized linker. In this work, we assessed the tethering method. The intermolecular disulfide bond was cleaved in crystal with a reducing agent. The pose (i.e., conformation and position) of the presequence was identical to the previously determined pose. In another experiment, a longer linker than the optimized length was used for the tethering. The perturbation of the tether changed the pose slightly, but the interaction mode was preserved. These results argue against the forced interaction of the presequence by its covalent attachment to Tom20. Second, as an alternative method referred to as "molecular stiffening", we introduced a disulfide bond within the presequence peptide to restrict the freedom of the peptide in the unbound states. One presequence analogue exhibited over 100-fold higher affinity than its linear counterpart and generated cocrystals with Tom20. One of the two crystallographic snapshots revealed a known pose previously determined by the tethering method, and the other snapshot depicted a new pose. These results confirmed and extended the dynamic, multiple bound state model of the Tom20-presequence interactions and also demonstrated the validity of the molecular tethering and stiffening techniques in studies of transient protein-peptide interactions.

Web of Science ® 被引用回数 : 16

リンク情報
DOI
https://doi.org/10.1021/bi200470x
CiNii Articles
http://ci.nii.ac.jp/naid/80021886112
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/21591667
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000291500200010&DestApp=WOS_CPL

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