A Bessede

A Luch

A Poland

BN Fukunaga

C Esser

CA Richter

D Xu

E Fritsche

F Henkler

F Ohtake

H Reyes

IA Murray

K Stolpmann

KK Biggar

KW Bock

M Veldhoen

MB Kumar

MJ Lees

NA Davarinos

P Ramadoss

P Tarnow

PB Jones

PM Fernandez-Salguero

R Barouki

RS Pollenz

T Ikuta

T Tralau

TV Beischlag

TW Stone

W Wen

YZ Gu

Scientific Reports

AbstractThe aryl hydrocarbon receptor (AHR) shuttles continuously between cytoplasm and nucleus, unless ligand-binding triggers association with the AHR nuclear translocator (ARNT) and subsequent binding to cognate DNA motifs. We have now identified Val 647 as mandatory residue for export from the nucleus and AHR-function. This residue prevents inactivation of the receptor as a consequence of nuclear sequestration via constitutive import. Concomitantly mutants lacking this residue are exclusively localised in the nucleus. Although ligands accelerate nuclear import transiently, stable nuclear transition depends on a motif adjacent to Val 647 that comprises residues 650–661. Together, this defined region within the Q-rich domain regulates intracellular trafficking of the AHR in context of both nucleocytoplasmic shuttling and receptor activation. Nuclear export therefore depends on the previously characterised N-terminal NES and the newly identified motif that includes V647. Nucleocytoplasmic distribution of full-length human AHR is further affected by a section of the PST domain that shows sequence similarities with nuclear export signals. In concert, these motifs maintain a predominant cytoplasmic compartmentalisation, receptive for ligand binding.</jats:p

Anna Tkachenko

Frank Henkler

Joep Brinkmann

Juliane Sowada

Doris Genkinger

Christian Kern

Tewes Tralau

Andreas Luch

Crossref

The Q-rich/PST domain of the AHR regulates both ligand-induced nuclear transport and nucleocytoplasmic shuttling

The Q-rich/PST domain of the AHR regulates both ligand-induced nuclear transport and nucleocytoplasmic shuttling

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