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• W2017047148 abstract "Hyaluronan (HA)-binding protein 1 (HABP1) is multifunctional in nature and exists as a trimer through coiled-coil interaction between alpha-helices at its N- and C-termini. To investigate the importance of trimeric assemblage and HA-binding ability of HABP1, we generated and overexpressed variants of HABP1 by truncating the alpha-helices at its termini. Subsequently, these variants were transiently expressed in COS-1 cells to examine the influence of these structural variations on normal cell morphology, as compared with those imparted by HABP1. Substantiating the centrality of coiled-coil interaction for maintaining the trimeric assembly of HABP1, we demonstrate that disruption of trimerization does not alter the affinity of variants towards its ligand HA. Transient expression of HABP1 altered the morphology of COS-1 cells by generating numerous cytoplasmic vacuoles along with disruption of the f-actin network. Interestingly, the truncated variants also imparted identical morphological changes. Characterization of the cytoplasmic vacuoles revealed that most of these vacuoles were autophagic in nature, resembling those generated under stress conditions. The identical morphological changes manifested in COS-1 cells on transient expression of HABP1 or its variants is attributed to their comparable HA-binding ability, which in concert with endogenous HABP1, may deplete the cellular HA pool. Such quenching of HA below a threshold level in the cellular milieu could generate a stress condition, manifested through cytoplasmic vacuoles and a disassembly of the f-actin network." @default.
• W2017047148 created "2016-06-24" @default.
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• W2017047148 date "2004-06-15" @default.
• W2017047148 modified "2023-10-14" @default.
• W2017047148 title "Truncated variants of hyaluronan-binding protein 1 bind hyaluronan and induce identical morphological aberrations in COS-1 cells" @default.
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• W2017047148 doi "https://doi.org/10.1042/bj20040264" @default.
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