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Systems approaches reveal that ABCB and PIN proteins mediate co-dependent auxin efflux

Mellor, Nathan L; Voß, Ute; Ware, Alexander; Janes, George; Barrack, Duncan; Bishopp, Anthony; Bennett, Malcolm J; Geisler, Markus; Wells, Darren M; Band, Leah R

Systems approaches reveal that ABCB and PIN proteins mediate co-dependent auxin efflux Thumbnail


Authors

Alexander Ware

Duncan Barrack

Markus Geisler



Abstract

Members of the B family of membrane-bound ATP-binding cassette (ABC) transporters represent key components of the auxin-efflux machinery in plants. Over the last two decades experimental studies have shown that modifying ABCB expression affects auxin distribution and plant phenotypes. However, precisely how ABCB proteins transport auxin in conjunction with the more widely studied family of PIN-formed (PIN) auxin efflux transporters is unclear, and studies using heterologous systems have produced conflicting results.

Here, we integrate ABCB localization data into a multicellular model of auxin transport in the Arabidopsis thaliana root tip to predict how ABCB-mediated auxin transport impacts organ-scale auxin distribution. We use our model to test five potential ABCB–PIN regulatory interactions, simulating the auxin dynamics for each interaction and quantitatively comparing the predictions with experimental images of the DII-VENUS auxin reporter in wild type and abcb single and double loss-of-function mutants. Only specific ABCB–PIN regulatory interactions result in predictions that recreate the experimentally observed DII-VENUS distributions and long-distance auxin transport. Our results suggest that ABCBs enable auxin efflux independently of PINs; however, PIN-mediated auxin efflux is predominantly through a co-dependent efflux where co-localised with ABCBs.

Citation

Mellor, N. L., Voß, U., Ware, A., Janes, G., Barrack, D., Bishopp, A., Bennett, M. J., Geisler, M., Wells, D. M., & Band, L. R. (2022). Systems approaches reveal that ABCB and PIN proteins mediate co-dependent auxin efflux. Plant Cell, 34(6), 2309–2327. https://doi.org/10.1093/plcell/koac086

Journal Article Type Article
Acceptance Date Mar 10, 2022
Online Publication Date Mar 18, 2022
Publication Date 2022-06
Deposit Date Mar 22, 2022
Publicly Available Date Mar 22, 2022
Journal The Plant Cell
Print ISSN 1040-4651
Electronic ISSN 1532-298X
Publisher American Society of Plant Biologists
Peer Reviewed Peer Reviewed
Volume 34
Issue 6
Pages 2309–2327
DOI https://doi.org/10.1093/plcell/koac086
Keywords Cell Biology; Plant Science
Public URL https://nottingham-repository.worktribe.com/output/7644332
Publisher URL https://academic.oup.com/plcell/article/34/6/2309/6550511

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