Morphology and structural properties of pH-responsive amphiphilic peptides

Jeanne N. Shera, Daisuke Takahashi, Alvaro I. Herrera, Om Prakash, Xiuzhi Susan Sun

Research output: Contribution to journalArticle

Abstract

Protein nanomaterials at the peptide level have shown great potential for medical applications. Peptides change their morphological conformation because of changes in self-assembly properties when they are exposed to changes in solvent composition or pH. Two 15-residue peptide sequences, KhK (KKKFLIVIGSIIKKK) and Alternating Kh (KFLKKIVKIGKKSII), were designed for the purpose of determining the role of peptide sequence on solution morphology and conformation. KhK solutions exhibited a random coil to helical transition when solvent conditions were changed from water to a trifluorethanol/water solution at acidic pH. Alternating Kh solutions, however, demonstrated primarily random coil character under similar solvent and pH conditions as determined by circular dichroism spectroscopy and 2D- 1H- 1H nuclear magnetic resonance spectroscopy. At basic pH, circular dichroism spectroscopy and nuclear magnetic resonance spectroscopy analysis demonstrated that random coil character increased at basic pH for KhK, whereas Alternating Kh exhibited an increase in β-sheet character. Further analysis by transmission electron microscopy showed marked differences in the peptide solution morphology. Peptide particle aggregation and fiber formation were significantly affected by solvent composition and pH values for both peptide sequences.

Original languageEnglish
Pages (from-to)7981-7987
Number of pages7
JournalJournal of nanoscience and nanotechnology
Volume10
Issue number12
DOIs
Publication statusPublished - Dec 1 2010

Fingerprint

Peptides
peptides
Structural properties
Circular dichroism spectroscopy
coils
magnetic resonance spectroscopy
Nuclear magnetic resonance spectroscopy
dichroism
Conformations
nuclear magnetic resonance
Water
Medical applications
Chemical analysis
Nanostructured materials
Self assembly
water
spectroscopy
self assembly
Agglomeration
Transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Morphology and structural properties of pH-responsive amphiphilic peptides. / Shera, Jeanne N.; Takahashi, Daisuke; Herrera, Alvaro I.; Prakash, Om; Sun, Xiuzhi Susan.

In: Journal of nanoscience and nanotechnology, Vol. 10, No. 12, 01.12.2010, p. 7981-7987.

Research output: Contribution to journalArticle

Shera, Jeanne N. ; Takahashi, Daisuke ; Herrera, Alvaro I. ; Prakash, Om ; Sun, Xiuzhi Susan. / Morphology and structural properties of pH-responsive amphiphilic peptides. In: Journal of nanoscience and nanotechnology. 2010 ; Vol. 10, No. 12. pp. 7981-7987.
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