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Biophysical Characterization of SG2NA Variants and their Interaction with DJ-1 and Calmodulin in vitro.
Cell Biochemistry and Biophysics 2018 December
SG2NA was first discovered as nuclear autoantigen in lung and bladder cancer patient. It was named SG2NA as its expression increases during S to G2 phase of cell cycle. SG2NA/Striatin3 was classified as a member of Striatin family along with Straitin and Zinedin due to its structural and functional relatedness. At the molecular level, SG2NA is characterized by the presence of multiple protein-protein interaction domains viz., a caveolin binding motif, a coiled coil structure, Ca2+ -calmodulin binding domain and a large WD-40 repeat domain in the same order from amino to the carboxyl termini. Analysis of secondary structures of 87 and 78 kDa SG2NA isoforms showed characteristic combinations of α-helix, β-structure, β-turns and random coil; suggesting of effective refolding after denaturation. This study for the first time establishes the structural differences between the two prevalent isoforms of SG2NA. Recently we observed that DJ-1 interacts with variants of SG2NA both in vitro and in vivo. The SG2NA isoforms purified from inclusion bodies showed the different secondary structure conformations, stability and interaction pattern for their interacting partners (DJ-1 and calmodulin) which imparts functional diversity of SG2NA. The SG2NA isoforms showed significant differential binding affinity to DJ-1 and Calmodulin.
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