Systems approaches reveal that ABCB and PIN proteins mediate co-dependent auxin efflux.
Systems approaches reveal that ABCB and PIN proteins mediate co-dependent auxin efflux.
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DOI:
10.1093/plcell/koac086
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发表时间:
2022-05-24
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影响因子:
--
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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 ATP-binding cassette sub-family B (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-localized with ABCBs. Predicting the experimentally observed root-tip auxin distribution requires ABCBs to efflux auxin independently, whereas PINs predominantly mediate auxin efflux where co-localized with ABCBs.
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影响因子:
64.8
作者:
Blilou, I;Xu, J;Scheres, B
通讯作者:
Scheres, B
影响因子:
56.9
作者:
Bennett, MJ;Marchant, A;Feldmann, KA
通讯作者:
Feldmann, KA
DOI:
10.1073/pnas.95.25.15112
发表时间:
1998-12-08
影响因子:
11.1
作者:
Chen, RJ;Hilson, P;Masson, PH
通讯作者:
Masson, PH
影响因子:
4.8
作者:
Hao, Pengchao;Xia, Jian;Geisler, Markus
通讯作者:
Geisler, Markus
影响因子:
3.3
作者:
Geisler, M;Kolukisaoglu, HÜ;Schulz, B
通讯作者:
Schulz, B