JOURNAL ARTICLE

Self-assembly of peptide-amphiphile C12-Abeta(11-17) into nanofibrils

Manli Deng, Defeng Yu, Yanbo Hou, Yilin Wang
Journal of Physical Chemistry. B 2009 June 25, 113 (25): 8539-44
19534562
A peptide-amphiphile (C12-Abeta(11-17)) was constructed with a key fragment of amyloid beta-peptide (Abeta(11-17)) attached to dodecanoic acid through an amide bond. The self-assembly behavior of C12-Abeta(11-17) in aqueous solution is studied at 25 degrees C and at pH 3.0 and 10.0. Abeta(11-17) cannot form ordered self-assemblies. But C12-Abeta(11-17) exhibits a very strong ability to form ordered nanofibrils, and the specific fine structure of the nanofibrils can be modulated simply by adjusting the concentration or pH. The critical micelle concentration of C12-Abeta(11-17) was determined as 0.063 and 0.11 mM at pH 3.0 and 10.0, respectively, indicating a stronger assembling ability of C12-Abeta(11-17) at acidic pH. In 0.47 mM C12-Abeta(11-17) solution at pH 3.0, rodlike fibrils with a diameter of approximately 5 nm and varying length of hundreds of nanometers are observed. When the C12-Abeta(11-17) concentration increases to 1.87 mM at pH 3.0, the above rodlike fibrils pack in parallel and form tapelike fibrils through lateral association. In 1.87 mM C12-Abeta(11-17) solution at pH 10.0, twisted fibrils with regular periodicity of approximately 200 nm are formed by the twisting of approximately 20 nm wide and approximately 11 nm thick nanoribbons. The hydrophobic moiety is necessary in fibril formation, whereas the beta-sheet secondary structure of the peptide moiety plays an essential role in the twisting morphology. This work helps to understand the possible mechanism in amyloid fibrillogenesis and provides an approach to inscribe biological signals in self-assemblies with potential application in biomaterial fabrication.

Full Text Links

Find Full Text Links for this Article

Discussion

You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read
19534562
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"