| Title : Smoke-derived karrikin perception by the alpha\/beta-hydrolase KAI2 from Arabidopsis - Guo_2013_Proc.Natl.Acad.Sci.U.S.A_110_8284 |
| Author(s) : Guo Y , Zheng Z , La Clair JJ , Chory J , Noel JP |
| Ref : Proc Natl Acad Sci U S A , 110 :8284 , 2013 |
| Abstract : Genetic studies in Arabidopsis implicate an alpha/beta-hydrolase, KARRIKIN-INSENSITIVE 2 (KAI2) as a receptor for karrikins, germination-promoting butenolide small molecules found in the smoke of burned plants. However, direct biochemical evidence for the interaction between KAI2 and karrikin and for the mechanism of downstream signaling by a KAI2-karrikin complex remain elusive. We report crystallographic analyses and ligand-binding experiments for KAI2 recognition of karrikins. The karrikin-1 (KAR1) ligand sits in the opening to the active site abutting a helical domain insert but distal from the canonical catalytic triad (Ser95-His246-Asp217) of alpha/beta-hydrolases, consistent with the lack of detectable hydrolytic activity by purified KAI2. The closest approach of KAR1 to Ser95-His246-Asp217 is 3.8 A from His246. Six aromatic side chains, including His246, encapsulate KAR1 through geometrically defined aromatic-aromatic interactions. KAR1 binding induces a conformational change in KAI2 at the active site entrance. A crevice of hydrophobic residues linking the polar edge of KAR1 and the helical domain insert suggests that KAI2-KAR1 creates a contiguous interface for binding signaling partners in a ligand-dependent manner. |
| ESTHER : Guo_2013_Proc.Natl.Acad.Sci.U.S.A_110_8284 |
| PubMedSearch : Guo_2013_Proc.Natl.Acad.Sci.U.S.A_110_8284 |
| PubMedID: 23613584 |
| Gene_locus related to this paper: arath-AtD14 |
| Gene_locus related to this paper: arath-AtD14 |
Guo Y, Zheng Z, La Clair JJ, Chory J, Noel JP (2013)
Smoke-derived karrikin perception by the alpha\/beta-hydrolase KAI2 from Arabidopsis
Proc Natl Acad Sci U S A
110 :8284
Guo Y, Zheng Z, La Clair JJ, Chory J, Noel JP (2013)
Proc Natl Acad Sci U S A
110 :8284