NCBI Accession #
NP_567920.1
NCBI GenBank Nucleotide #
NM_119497.5
NCBI Official Full Name
BRI1-associated receptor kinase
NCBI Official Symbol
BAK1
NCBI Official Synonym Symbols
ATBAK1; ATSERK3; BRI1-associated receptor kinase; ELG; ELONGATED; F17M5.190; F17M5_190; RECEPTOR KINASES LIKE SERK 10; RKS10; SERK3; SOMATIC EMBRYOGENESIS RECEPTOR-LIKE KINASE 3
NCBI Protein Information
BRI1-associated receptor kinase
NCBI Summary
Leu-rich receptor Serine/threonine protein kinase. Component of BR signaling that interacts with BRI1 in vitro and in vivo to form a heterodimer. Brassinolide-dependent association of BRI1 and BAK1 in vivo. Phosphorylation of both BRI1 and BAK1 on Thr residues was BR dependent. Although BAK1 and BRI1 alone localize in the plasma membrane, when BAK1 and BRI1 are coexpressed, the heterodimer BAK1/BRI1 they form is localized in the endosome.
UniProt Synonym Gene Names
AtSERK3
UniProt Protein Name
BRASSINOSTEROID INSENSITIVE 1-associated receptor kinase 1
UniProt Synonym Protein Names
Protein ELONGATED; Somatic embryogenesis receptor kinase 3
UniProt Primary Accession #
Q94F62
UniProt Secondary Accession #
Q9SZC0; C0LGS0
UniProt Related Accession #
Q94F62
UniProt Comments
Dual specificity kinase acting on both serine/threonine- and tyrosine-containing substrates. Controls the expression of genes associated with innate immunity in the absence of pathogens or elicitors. Involved in brassinosteroid (BR) signal transduction. Phosphorylates BRI1. May be involved in changing the equilibrium between plasma membrane-located BRI1 homodimers and endocytosed BRI1-BAK1 heterodimers. Interaction with MSBP1 stimulates the endocytosis of BAK1 and suppresses brassinosteroid signaling. Acts in pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) via its interactions with FLS2 and EFR, and the phosphorylation of BIK1. Involved in programmed cell death (PCD) control. Positively regulates the BR-dependent plant growth pathway and negatively regulates the BR-independent cell-death pathway (PubMed:17583510, PubMed:17600708, PubMed:18667726, PubMed:18694562, PubMed:19124768, PubMed:20018402, PubMed:20404519, PubMed:21350342, PubMed:21693696). Phosphorylates BIR2 and thus promotes interaction with BIR2 (PubMed:24388849, PubMed:24556575). This interaction prevents interaction with FLS2 in the absence of pathogen-associated molecular patterns (PAMP) (PubMed:24388849, PubMed:24556575). Required for PSK promotion of seedling growth and protoplast expansion (PubMed:26071421). CNGC17 and AHAs form a functional cation-translocating unit that is activated by PSKR1/BAK1 and possibly other BAK1/RLK complexes (PubMed:26071421).