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  NTA-Co3+-His6 versus NTA-Ni2+-His6 mediated E-Cadherin surface immobilization enhances cellular traction

Di Russo, J., Young, J. L., Balakrishnan, A., Benk, A. S., & Spatz, J. P. (2018). NTA-Co3+-His6 versus NTA-Ni2+-His6 mediated E-Cadherin surface immobilization enhances cellular traction. Biomaterials, 042, pp. 1-24. doi:10.1016/j.biomaterials.2018.10.042.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-0BA6-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-79A0-1
Genre: Journal Article

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 Creators:
Di Russo, Jacopo1, Author              
Young, Jennifer L.1, Author              
Balakrishnan , Adithya, Author
Benk, Amelie S.1, Author              
Spatz, Joachim P.1, Author              
Affiliations:
1Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_2364731              

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Free keywords: Cobalt; Nitrilotriacetic acid; E-Cadherin; Traction-force; Cell adhesion; Surface functionalization
 Abstract: Understanding the biological impact of strategies for protein immobilization onto bioactive surfaces is crucial for the design of biomimetic materials. A common strategy used to immobilize or label recombinant proteins is to exploit the Ni2+-mediated interaction of nitrilotriacetic acid (NTA) with the hexahistidine tag (His6-tag) present on recombinant proteins. While this method ensures a controlled orientation and functionality of the protein, the kinetically labile nature of the bond ensures only its weak immobilization onto the surface. Recently, it has been shown that the oxidation of Co2+ to Co3+ greatly stabilizes the bond between NTA and the His6-tagged proteins, making it inert to ligand exchange and resistant to chelators. This approach not only has the potential to improve the quality of biomimetic material functionalization and molecule labeling but could also affect cellular mechanical responses for which the mechanical strength of the protein-surface bond is crucial. Here, we compared gold (Au) nanopatterned polyacrylamide (PAA) hydrogels functionalized with E-cadherin via Co3+ with those functionalized via Ni2+ for studying adhesion-mediated responses in keratinocytes. We show that keratinocytes develop higher and a broader range of adhesion forces, leading to extended cell spreading and colony organization on Co3+ vs. Ni2+. This work uniquely shows that stabilizing the NTA/His6-tag bond via Co3+ for protein immobilization significantly impacts cellular phenotype on biomimetic materials by impacting cell signaling.

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Language(s): eng - English
 Dates: 2018-10-232018-07-122018-10-282018-11-032018-11-03
 Publication Status: Published in print
 Pages: 24
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
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Title: Biomaterials
Source Genre: Journal
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Publ. Info: Guildford, England : Elsevier
Pages: - Volume / Issue: - Sequence Number: 042 Start / End Page: 1 - 24 Identifier: ISSN: 0142-9612
CoNE: https://pure.mpg.de/cone/journals/resource/954925472369