Citation: Ji-han Zhou, Hao Wen, Cui-cui Su, Lin Niu, De-hai Liang. Complexation between DNA and Peptides with Precisely Controlled Charge Density and Distribution[J]. Chinese Journal of Polymer Science, ;2014, 32(11): 1460-1468. doi: 10.1007/s10118-014-1478-x shu

Complexation between DNA and Peptides with Precisely Controlled Charge Density and Distribution

Ji-han Zhou ¹ ,
Hao Wen ¹ ,
Cui-cui Su ¹ ,
Lin Niu ¹ ,
De-hai Liang ^1,,

1.
Beijing National Laboratory for Molecular Sciences and the Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Corresponding author: De-hai Liang,
Received Date: 3 January 2014
Revised Date: 25 February 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 21174007 and 20990232).

Using three designed peptides with precisely-controlled charge density and three types of DNAs with different length and flexibility, the effect of charge density on the formation of PEC was studied. Highly charged (KKKK)5 interacts strongly with 21 bp dsDNA to form large complex, followed by precipitation; while the medium charged (KGKG)5 only form complex with 21 bp dsDNA at proper +/- charge ratios; and no prominent complex between weakly charged (KGGG)5 and 21 bp dsDNA is observed at the same conditions. Similar trend is observed when the peptides form complex with 2000 bp DNA or 21nt ssDNA. It is also found that the complex formed by adding peptide to DNA is in random coil conformation, but the complex prepared by the inverse order is in molten globule state. Re-dissolution of the complex occurs only when DNA is added to peptides with similar or shorter length.
- Peptide,
- Charge density,
- DNA,
- Polyelectrolyte complex
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