title: Surface organization and nanopatterning of collagen by dip-pen nanolithography.
abstract: Collagen is a key fibrous protein in biological systems, characterized by a complex structural hierarchy as well as the ability to self-assemble into liquid crystalline mesophases. The structural features of collagen influence cellular responses and material properties, with importance for a wide range of biomaterials and tissue architectures. The mechanism by which fibrillar collagen structures form from liquid crystalline mesophases is not well characterized. We report positive printing of collagen and a collagen-like peptide down to 30-50-nm line widths, using the atomic force microscopy technique of dip-pen nanolithography. The method preserved the triple-helical structure and biological activity of collagen and even fostered the formation of characteristic higher levels of structural organization. The "direct-write" capability of biologically relevant molecules, while preserving their structure and functionality, provides tremendous flexibility in future biological device applications and in proteomics arrays, as well as a new strategy to study the important hierarchical assembly processes of biological systems.
authors.affiliation: Department of Chemical and Biological Engineering and Bioengineering Center, Tufts University, Medford, MA 02155, USA.
authors.forename: D L
authors.initials: DL
authors.lastname: Wilson
authors.forename: R
authors.initials: R
authors.lastname: Martin
authors.forename: S
authors.initials: S
authors.lastname: Hong
authors.forename: M
authors.initials: M
authors.lastname: Cronin-Golomb
authors.forename: C A
authors.initials: CA
authors.lastname: Mirkin
authors.forename: D L
authors.initials: DL
authors.lastname: Kaplan
mesh_terms: D003094:Collagen / Q000737:chemistry*; D007091:Image Processing, Computer-Assisted; D018625:Microscopy, Atomic Force / Q000379:methods; D010455:Peptides / Q000737:chemistry*
chemical_list: D010455:Peptides; D003094:Collagen