2NAM

Full-length WT SOD1 in DPC MICELLE

2NAM の概要

• エントリーDOI: 10.2210/pdb2nam/pdb
• NMR情報: BMRB: 25942
• 分子名称: Superoxide dismutase [Cu-Zn] (1 entity in total)
• 機能のキーワード: superoxide dismutase 1, dpc micelle, full length sod1, phospholipid interaction, metal binding protein
• 由来する生物種: Homo sapiens (human)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 16844.69

構造登録者

Lim, L.,Song, J. (登録日: 2016-01-06, 公開日: 2016-12-14, 最終更新日: 2024-05-01)

主引用文献

Lim, L.,Song, J.
SALS-linked WT-SOD1 adopts a highly similar helical conformation as FALS-causing L126Z-SOD1 in a membrane environment
Biochim.Biophys.Acta, 1858:2223-2230, 2016

PubMed Abstract: So far >180 mutations have been identified within the 153-residue human SOD1 to cause familial amyotrophic lateral sclerosis (FALS), while wild-type (WT) SOD1 was intriguingly implicated in sporadic ALS (SALS). SOD1 mutations lead to ALS by a dominant gain of cytotoxicity but its mechanism still remains elusive. Previously functional studies have revealed that SOD1 mutants became unexpectedly associated with organelle membranes. Indeed we decoded that the ALS-causing truncation mutant L126Z-SOD1 with an elevated toxicity completely loses the ability to fold into the native β-barrel structure but acquire a novel capacity to interact with membranes by forming helices over hydrophobic/amphiphilic segments. Very recently, the abnormal insertion of SOD1 mutants into ER membrane has been functionally characterized to trigger ER stress, an initial event of a cascade of cell-specific damages in ALS pathogenesis. Here we attempted to understand the mechanism for gain of cytotoxicity of the WT SOD1. We obtained atomic-resolution evidence that the nascent WT SOD1 without metalation and disulfide bridge is also highly disordered as L126Z. Most importantly, it owns the same capacity in interacting with membranes by forming very similar helices over the first 125 residues identical to L126Z-SOD1, plus an additional hydrophobic helix over Leu144-Ala152. Our study thus implies that the WT and mutant SOD1 indeed converge on a common mechanism for gain of cytotoxicity by abnormally interacting with membranes. Moreover, any genetic/environmental factors which can delay or impair its maturation might act to transform SOD1 into cytotoxic forms with the acquired capacity to abnormally interact with membranes.

PubMed: 27378311
DOI: 10.1016/j.bbamem.2016.06.027

実験手法

SOLUTION NMR