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Independent Membrane Binding Properties of the Caspase Generated Fragments of the Beaded Filament Structural Protein 1 (BFSP1) Involves an Amphipathic Helix

Jarrin, Miguel; Kalligeraki, Alexia A.; Uwineza, Alie; Cawood, Chris S.; Brown, Adrian P.; Ward, Edward N.; Le, Khoa; Freitag-Pohl, Stefanie; Pohl, Ehmke; Kiss, Bence; Tapodi, Antal; Quinlan, Roy A.

Independent Membrane Binding Properties of the Caspase Generated Fragments of the Beaded Filament Structural Protein 1 (BFSP1) Involves an Amphipathic Helix Thumbnail


Authors

Miguel Jarrin

Alexia A. Kalligeraki

Alie Uwineza

Chris S. Cawood

Edward N. Ward

Khoa Le

Bence Kiss

Antal Tapodi



Abstract

Background: BFSP1 (beaded filament structural protein 1) is a plasma membrane, Aqua- 21 porin 0 (AQP0/MIP)-associated intermediate filament protein expressed in the eye lens. BFSP1 is 22 myristoylated, a post-translation modification that requires caspase cleavage at D433. Bioinformatic 23 analyses suggested that the sequences 434-452 were a-helical and amphipathic. Methods and Re- 24 sults: By CD spectroscopy, we show that the addition of trifluoroethanol induced a switch from an 25 intrinsically disordered to a more a-helical conformation for the residues 434-467. Recombinantly 26 produced BFSP1 fragments containing this amphipathic helix bind to lens lipid bilayers as deter- 27 mined by surface plasmon resonance (SPR). Lastly, we demonstrate by transient transfection of non- 28 lens MCF7 cells that these same BFSP1 C-terminal sequences localise to plasma membranes and to 29 cytoplasmic vesicles. These can be co-labelled with the vital dye, lysotracker, but other cell compart- 30 ments such as the nuclear and mitochondrial membranes were negative. The N-terminal myristoy- 31 lation of the amphipathic helix appeared not to change either the lipid affinity or membrane locali- 32 sation of the BFSP1 polypeptides or fragments we assessed by SPR and transient transfection, but it 33 did appear to enhance its helical content. Conclusions: These data support the conclusion that C- 34 terminal sequences of human BFSP1 distal to the caspase site at G433 have independent membrane 35 binding properties via an adjacent amphipathic helix.

Citation

Jarrin, M., Kalligeraki, A. A., Uwineza, A., Cawood, C. S., Brown, A. P., Ward, E. N., …Quinlan, R. A. (2023). Independent Membrane Binding Properties of the Caspase Generated Fragments of the Beaded Filament Structural Protein 1 (BFSP1) Involves an Amphipathic Helix. Cells, https://doi.org/10.3390/cells12121580

Journal Article Type Article
Acceptance Date Jun 5, 2023
Online Publication Date Jun 7, 2023
Publication Date Jun 7, 2023
Deposit Date Jun 6, 2023
Publicly Available Date Aug 3, 2023
Journal Cells
Publisher MDPI
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.3390/cells12121580
Public URL https://durham-repository.worktribe.com/output/1173111
Publisher URL https://www.mdpi.com/journal/cells

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