Switch #: SWTI000718

Switch type: Pre-assembly

Switch subtype: Composite binding site formation

Description:
Binding of Protein TIFY 6B (TIFY6B) to Coronatine-insensitive protein 1 (COI1), an F-box substrate recognition subunit of the SCF E3 ubiquitin ligase, depends on binding of the plant hormone jasmonate to COI1, as this pre-assembled complex provides a composite binding site for the degron motif in TIFY6B. Subsequent ubiquitylation of TIFY6B by the SCF targets this transcriptional repressor for proteasomal degradation, a pre-requisite for the transcriptional response to jasmonate.

Participants:
(1)
(2) Coronatine-insensitive protein 1 (COI1)
(3) Protein TIFY 6B (TIFY6B)

This is a sequential switch. The interactions in this switch take place in a defined order. The order is defined by numbers to the left of each interaction. More than one interaction can occur in each step, these interactions occur independently but are necessary for future step

1Interaction #1 - COI1

Interfaces
(1) N-[(3R,7S)-(+)-7-iso-Jasmonoyl]-(S)-isoleucine in
(2) Coronatine-insensitive protein 1 (COI1)

2Interaction #2 TIFY6B - Interaction #1 - COI1

Requires Interaction #1 - COI1

Interfaces
(3) DEG_SCF_COI1_1 motif (₃₀₃LARKASLARFLEKRKERV₃₂₀) in Protein TIFY 6B (TIFY6B)
(4) Interaction #1 - COI1

(1) The JAZ family of repressors is the missing link in jasmonate signalling.
Chini et al. Nature (2007)

(2) A critical role of two positively charged amino acids in the Jas motif of Arabidopsis JAZ proteins in mediating coronatine- and jasmonoyl isoleucine-dependent interactions with the COI1 F-box protein.
Melotto et al. Plant J. (2008)

Other switches involving participants
- 5 more (view)
Coronatine-insensitive protein 1 (COI1) - 3 more (view)

Other switches involving interfaces
Leucine-rich repeat (LRR) - 11 more (view)
N-[(3R,7S)-(+)-7-iso-Jasmonoyl]-(S)-isoleucine - 5 more (view)
DEG_SCF_COI1_1 - 5 more (view)