Signal peptide of FadA adhesin from Fusobacterium nucleatum plays a novel structural role by modulating the filament's length and width.

Signal peptide of FadA adhesin from Fusobacterium nucleatum plays a novel structural role by modulating the filament's length and width.
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DOI:
10.1016/j.febslet.2011.10.047
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发表时间:
2012-01-02
期刊:
影响因子:
3.5
通讯作者:
Han YW
Han YW
中科院分区:
生物学3区
文献类型:
--
作者:
Témoin S;Wu KL;Wu V;Shoham M;Han YW

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FADA是一种新的牙周致病菌核梭杆菌粘附素,由前FADA和成熟FADA两种形式组成,构成功能性FADA复合体(FadAc)。在电子显微镜下,我们观察到mFadA形成了均匀细长的细丝,而FadAc形成了不同长度和宽度的异质细丝,以及“结”。信号肽或保留异质结构的非α螺旋环中的突变体具有结合活性,而形成聚集体或长丝的突变体失去活性。这些观察表明,短丝和结可能是FADA的活跃形式。这是第一次证明细菌粘附素的组装需要信号肽。
FadA, a novel adhesin of periodontal pathogen Fusobacterium nucleatum is composed of two forms, pre-FadA and mature FadA (mFadA), constituting the functional FadA complex (FadAc). By electron microscopy, we observed that mFadA formed uniformly long and thin filaments, while FadAc formed heterogeneous filaments of varying lengths and widths, as well as “knots”. Mutants in signal peptide or in the non-alpha helical loop retaining heterogeneous structures had binding activity while those forming aggregates or long filaments lost activity. These observations suggest short filaments and knots may be the active forms of FadA. This is the first demonstration that a signal peptide is required for the assembly of a bacterial adhesin.
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