NCBI Accession #
NP_001325056.1
NCBI GenBank Nucleotide #
NM_001336055.1
NCBI Official Full Name
G protein alpha subunit 1
NCBI Official Symbol
GP ALPHA 1
NCBI Official Synonym Symbols
ARABIDOPSIS THALIANA G PROTEIN ALPHA SUBUNIT 1; ATGPA1; G PROTEIN ALPHA SUBUNIT; G protein alpha subunit 1; G PROTEIN ALPHA SUBUNIT 1; GPA1; T1D16.6; T1D16_6
NCBI Protein Information
G protein alpha subunit 1
NCBI Summary
Encodes an alpha subunit of a heterotrimeric GTP-binding protein. The active GTP-bound form of GPA1 binds to the GTG1 and GTG2 abscisic acid (ABA) receptors and appears to affect their GTPase and GTP-binding activity, and hence, ABA binding abilities. GPA1 is a positive regulator in ABA-mediated inhibition of stomatal opening. Plants with recessive mutant alleles have complex phenotypes including: reduced brassinolide response, reduced cell divisions, round leaves, short hypocotyls. It is likely to be involved in the signaling events that trigger unfolded protein response-associated cell death. GPA1 is also involved in sugar signaling.
UniProt Synonym Gene Names
GP-alpha-1
UniProt Protein Name
Guanine nucleotide-binding protein alpha-1 subunit
UniProt Primary Accession #
P18064
UniProt Related Accession #
P18064
UniProt Comments
Exhibits a fast rate of basal nucleotide exchange. Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. Together with GCR1, may regulate the cell cycle via a signaling cascade that uses phosphatidylinositol-specific phospholipase C (PI-PLC) as an effector and inositol 1,4,5-trisphosphate (IP3) as a second messenger. Promotes abscisic acid (ABA) responses in guard cells. But, together with GCR1 and GB1, acts as a negative regulator of ABA during seed germination and early seedling development. Involved in the blue light (BL) signaling. Together with GCR1 and ADT3, required for BL-mediated synthesis of phenylpyruvate and subsequently of phenylalanine (Phe), in etiolated seedlings. Modulates root architecture (e.g. lateral root formation). Negatively regulated by RGS1.