IBR5 cDNA ORF clone, Arabidopsis thaliana(thale cress)

Sequence and analysis of chromosome 2 of the plant Arabidopsis thaliana.
Lin X, Kaul S, Rounsley S, Shea TP, Benito MI, Town CD, Fujii CY, Mason T, Bowman CL, Barnstead M, Feldblyum TV, Buell CR, Ketchum KA, Lee J, Ronning CM, Koo HL, Moffat KS, Cronin LA, Shen M, Pai G, Van Aken S, Umayam L, Tallon LJ, Gill JE, Adams MD, Carrera AJ, Creasy TH, Goodman HM, Somerville CR, Copenhaver GP, Preuss D, Nierman WC, White O, Eisen JA, Salzberg SL, Fraser CM, Venter JC
Nature402(6763)761-8(1999 Dec)

IBR5 encodes a putative dual-specificity protein phosphatase. The accumulation of CHS3 protein at chilling temperatures is inhibited by the IBR5 mutation.
Title: IBR5 Modulates Temperature-Dependent, R Protein CHS3-Mediated Defense Responses in Arabidopsis.

Microarray analysis of tink/ibr5-6 mutants identified a likely role for this phosphatase in male gametophyte development. IBR5 may influence the size and shape of petals through auxin and TCP growth regulatory pathways.
Title: The Tinkerbell (Tink) Mutation Identifies the Dual-Specificity MAPK Phosphatase INDOLE-3-BUTYRIC ACID-RESPONSE5 (IBR5) as a Novel Regulator of Organ Size in Arabidopsis.

IBR5 is a MAPK phosphatase that dephosphorylates and inactivates MPK12.
Title: Arabidopsis mitogen-activated protein kinase MPK12 interacts with the MAPK phosphatase IBR5 and regulates auxin signaling.

Arabidopsis iba response5 suppressors separate responses to various hormones
Title: Arabidopsis iba response5 suppressors separate responses to various hormones.

Data suggest that IBR5 is a phosphatase that promotes auxin responses, including auxin-inducible transcription, differently than the TIR1 auxin receptor and without destabilizing Aux/IAA repressor proteins.
Title: The IBR5 phosphatase promotes Arabidopsis auxin responses through a novel mechanism distinct from TIR1-mediated repressor degradation.