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SPAK is a powerful regulator of peptide transporters PEPT1 and PEPT2
We identified for the first time a homozygous point mutation in STRADA causing PMSE. Additional bi-allelic mutations related to PMSE thus far have not been observed in Baylor approximately 6,000 consecutive clinical WES cases, supporting the rarity of this disorder.
aberrant nuclear accumulation of LKB1 caused by STRADalpha deficiency contributes to hyperactivation of mTORC1 signaling and disruption of neuronal lamination during corticogenesis
Several novel splice isoforms of STRADalpha that differentially affect the kinase activity, complex assembly, subcellular localization of LKB1 and the activation of the LKB1-dependent AMPK pathway were discovered.
study describes structure of the core heterotrimeric LKB1-STRADalpha-MO25alpha complex, revealing an unusual allosteric mechanism of LKB1 activation; structure also reveals how mutations in Peutz-Jeghers syndrome & sporadic cancers impair LKB1 function
Identification and characterization of an LKB1-specific adaptor protein and substrate, STRAD. Results imply that STRAD plays a key role in regulating the tumor suppressor activities of LKB1.
identify a multifactored mechanism to control LKB1 localization, and they suggest that the STRADbeta-LKB1 complex might possess unique functions in the nucleus
LKB1 deacetylation is regulated by SIRT1 and that this in turn influences its intracellular localization, association with STRAD, kinase activity, and ability to activate AMPK.
STRADalpha.MO25alpha complexes containing LKB1 variants were equally effective at phosphorylating and activating AMPK, BRSK1, and BRSK2
These data define a brush border induction pathway downstream of the Lkb1/Strad/Mo25 polarization complex, yet separate from other polarity events.
ATP and MO25alpha cooperate to maintain STRADalpha in an "active" closed conformation required for LKB1 activation.
Quantitative PCR revealed significantly reduced LKB1, MO25alpha, and STRADbeta mRNA in LKB1(-/-) muscle. These findings demonstrate that the LKB1-MO25-STRAD complex is the principal AMPKK in skeletal muscle.
The protein encoded by this gene contains a STE20-like kinase domain, but lacks several residues that are critical for catalytic activity, so it is termed a 'pseudokinase'. The protein forms a heterotrimeric complex with serine/threonine kinase 11 (STK11, also known as LKB1) and the scaffolding protein calcium binding protein 39 (CAB39, also known as MO25). The protein activates STK11 leading to the phosphorylation of both proteins and excluding STK11 from the nucleus. The protein is necessary for STK11-induced G1 cell cycle arrest. A mutation in this gene has been shown to result in polyhydramnios, megalencephaly, and symptomatic epilepsy (PMSE) syndrome. Multiple transcript variants encoding different isoforms have been found for this gene. Additional transcript variants have been described but their full-length nature is not known.
protein kinase LYK5
, STE20-related kinase adapter protein alpha
, STE20-related kinase adaptor alpha
, STE20-related kinase adapter protein alpha-like
, STE20-like pseudokinase
, STRAD alpha
, serologically defined breast cancer antigen NY-BR-96
, STE20-related adapter protein