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    A spectroscopic sensing platform for MARCKS protein monolayers

    Year: 2017

    Journal: J. Colloid Interface Sci., Volume 508, DEC 15, page 532–541

    Authors: Klug, Joaquin; Fernanda Torresan, Maria; Lurgo, Florencia; Borioli, Graciela; Lacconi, Gabriela I.

    Organizations: INFIQC-CONICET; CIQUIBIC-CONICET; FonCyT; SECyT-UNC; CONICET

    Keywords: Silver nanoparticles electrodeposition; SERS active platforms; Intrinsically unstructured proteins; MARCKS; Langmuir-Blodgett monolayers

    We developed a highly sensitive silicon platform, suitable to assess the molecular organization of protein samples. Prototype platforms were obtained using different electrochemical protocols for the electrode position of Ag-nanoparticles onto the hydrogenated silicon surface. A platform with high Surface Enhanced Raman Scattering efficiency was selected based on the surface coverage and the number density of particles size distribution. The performance of the platform was determined by studying the interaction of Myristoylated Alanine-Rich C Kinase Substrate (MARCKS) protein with the substrate according to its molecular organization. The chemical and structural characteristics of MARCKS molecules were examined under two configurations: i) a disordered distribution given by a MARCKS solution drop deposited onto the platform and, ii) a compact monolayer transferred to the platform by the Langmuir-Blodgett method. Raman spectra show vibrational bands of Phenylalanine and Lysine residues specific for the protein effector domain, and evidence the presence of alpha helix structure in both configurations. Moreover, we distinguished the supramolecular order between the compact monolayer and random molecular distribution. The platforms containing Ag-nanoparticles are suitable for studies of protein structure and interactions, advancing a methodological strategy for our long term goal, which is to explore the interaction of proteins with model membranes. (C) 2017 Elsevier Inc. All rights reserved.
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