PXD009422

PXD009422 is an original dataset announced via ProteomeXchange.

Title	Abscisic acid-induced degradation of Arabidopsis guanine nucleotide exchange factor requires calcium-dependent protein kinases, part 2
Description	Abscisic acid (ABA) plays essential roles in plant development and responses to environmental stress. ABA induces subcellular translocation and degradation of the guanine nucleotide exchange factor RopGEF1 thus facilitating ABA core signal transduction. However, the underlying mechanisms for ABA-triggered RopGEF1 trafficking/degradation remain unknown. Studies have revealed that RopGEFs associate with receptor-like kinases to convey developmental signals to small ROP GTPases. However, how the activities of RopGEFs are modulated is not well understood. Type 2C protein phosphatases stabilize the RopGEF1 protein, indicating that phosphorylation may trigger RopGEF1 trafficking and degradation. We have screened inhibitors followed by several protein kinase mutants and find that quadruple mutant plants in the Arabidopsis calcium-dependent protein kinases (CPKs) cpk3/4/6/11 disrupt ABA-induced trafficking and degradation of RopGEF1. Moreover, cpk3/4/6/11 partially impairs ABA inhibition of germination. Several CPKs interact with RopGEF1. CPK4 binds to and phosphorylates RopGEF1 and promotes the degradation of RopGEF1. CPK-mediated phosphorylation of RopGEF1 at specific N-terminal serine residues causes the degradation of RopGEF1 and mutation of these sites also compromises the RopGEF1 over-expression phenotype in root hair development in Arabidopsis. Our findings establish the physiological and molecular functions and relevance of calcium-dependent protein kinases in regulation of RopGEF1 and illuminate physiological roles of a CPK-GEF-ROP module in abscisic acid signaling and plant development. We further discuss that CPK-dependent RopGEF degradation during abiotic stress could provide a mechanism for down-regulation of RopGEF-dependent growth responses.
HostingRepository	PRIDE
AnnounceDate	2019-11-12
AnnouncementXML	Submission_2019-11-12_10:48:44.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Majid Ghassemian
SpeciesList	scientific name: Arabidopsis thaliana (Mouse-ear cress); NCBI TaxID: 3702;
ModificationList	phosphorylated residue
Instrument	Orbitrap Fusion Lumos

Revision	Datetime	Status	ChangeLog Entry
0	2018-04-06 02:10:15	ID requested
⏵ 1	2019-11-12 10:48:45	announced

Li Z, Takahashi Y, Scavo A, Brandt B, Nguyen D, Rieu P, Schroeder JI, guanine nucleotide exchange factor requires calcium-dependent protein kinases. Proc Natl Acad Sci U S A, 115(19):E4522-E4531(2018) [pubmed]

curator keyword: Biological

submitter keyword: arabidopsis, ABA, CPK4, RopGEF

majid ghassemian
contact affiliation	chemistry biochemistry UCSD
contact email	mghassem@ucsd.edu
lab head
Majid Ghassemian
contact affiliation	Scientist
contact email	mghassem@ucsd.edu
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD009422
     1. Label: PRIDE project
     2. Name: Abscisic acid-induced degradation of Arabidopsis guanine nucleotide exchange factor requires calcium-dependent protein kinases, part 2