Interactions of PIN and PGP auxin transport mechanisms.

Abstract:

:Polarized transport of the plant hormone auxin influences multiple growth processes in plants and is regulated by plasma-membrane-localized efflux and uptake carriers. The PGP (P-glycoprotein) ABC transporters (ATP-binding-cassette transporters), PIN (pin-formed) subfamily of major facilitator proteins and members of AUX/LAX families have been shown to independently transport auxin both in planta and in heterologous systems. However, PIN- and PGP-mediated transport in heterologous systems exhibits decreased substrate specificity and inhibitor-sensitivity compared with what is seen in plants and plant cells. To determine whether PIN-PGP interactions enhance transport specificity, we analysed interactions of the representative auxin-transporting PGPs with PIN1 and AUX1 in planta and in heterologous systems. Here, we provide evidence that PINs and PGPs interact and function both independently and co-ordinately to control polar auxin transport and impart transport specificity and directionality. These interactions take place in protein complexes stabilized by PGPs in detergent-resistant microdomains.

journal_name

Biochem Soc Trans

authors

Bandyopadhyay A,Blakeslee JJ,Lee OR,Mravec J,Sauer M,Titapiwatanakun B,Makam SN,Bouchard R,Geisler M,Martinoia E,Friml J,Peer WA,Murphy AS

doi

10.1042/BST0350137

subject

Has Abstract

pub_date

2007-02-01 00:00:00

pages

137-41

issue

Pt 1

eissn

0300-5127

issn

1470-8752

pii

BST0350137

journal_volume

35

pub_type

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