Citation: Qi Qi, Zhao Tian-Xin, An Bo-Lin, Liu Xuan-Yong, Zhong Chao. Self-assembly and morphological characterization of two-component functional amyloid proteins[J]. Chinese Chemical Letters, ;2017, 28(5): 1062-1068. doi: 10.1016/j.cclet.2016.12.008 shu

Self-assembly and morphological characterization of two-component functional amyloid proteins

Qi Qi ^a,b,c ,
Zhao Tian-Xin ^a ,
An Bo-Lin ^a ,
Liu Xuan-Yong ^b ,
Zhong Chao ^a,,

a.
School of Physical Science and Technology, ShanghaiTech University, Shanghai 200120, China
b.
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
c.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Zhong Chao, zhongchao@shanghaitech.edu.cn
Received Date: 8 October 2016
Revised Date: 10 November 2016
Accepted Date: 29 November 2016
Available Online: 10 May 2016

Figures(5)

Functional amyloid has been increasingly applied as self-assembling nanostructures to construct multifunctional biomaterials. However, little has been known how different side domains, varied fusion positions and subunits affect self-assembly and morphologies of amyloid fibrils. Here, we constructed three groups of two-component amyloid proteins based on CsgA, the major protein components of Escherichia coli biofilms, to bridge these gaps. We showed that all fusion proteins have amyloid features, as indicated by Congo red assay. Atomic force microscopy (AFM) indeed reveals that these fusion proteins are able to self-assemble into fibrils, with an average diameter of 0.5-2 nm and length of hundreds of nanometers to several micrometers. The diameter of fibrils increases with the increase of the molecular weight of fusion domains, while the dynamic assembly of recombinant proteins was delayed as a result of the introduction of fusion domains. Moreover, fusion of the same functional domains but at intermediate position seems to cause the most interference on fibril assembly compared with those fused at C or Nterminus, as mainly short and irregular fibrils were detected. This phenomenon appears more pronounced for randomly coiled mussel foot proteins (Mfps) than for rigid chitin-binding domain (CBD). Finally, increase of the molecular weight of tandem repeats in protein monomer seemed to increase the fibril diameter of the resultant fibrils, but either reduction of the tandem repeats of CsgA to one single belta-sheet loop or increase in the number of tandem repeats of CsgAs from one to four produced shorter and intermittent fibrils compared with CsgA control protein. These studies therefore provide insights into self-assembly of two-component amyloid proteins and lay the foundation for rational design of multifunctional molecular biomaterials.
- Amyloid,
- Biofilms,
- Atomic force microscopy,
- Self-assembly,
- Nanomaterials,
- Supramolecular structure
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