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CTNNB1 phosphorylates CTNNB1 on serine. 5 / 5
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reach
"In non tumor cells, cytoplasmic beta-catenin levels are kept low due to its binding to a protein complex called the beta-catenin destruction complex (containing the APC tumor suppressor, the scaffold [MISSING/INVALID CREDENTIALS: limited to 200 char for Elsevier]"

reach
"Activation of PKC-alpha inhibited beta-catenin response transcription by down-regulation of intracellular beta-catenin and induced phosphorylation of the N-terminal serine and threonine residues (Ser33/Ser37/Thr41) of beta-catenin, marking it for proteasomal degradation, in colon cancer cells."

reach
"In the absence of Wnt ligand, Axin contributes to the formation of beta-catenin destruction complex, which leads to phosphorylation of beta-catenin on serine and threonine residues near its N-terminus providing beta-catenin a target for ubiquitination and rendering it to ubiquitin dependent proteasome mediated degradation [XREF_BIBR, XREF_BIBR, XREF_BIBR]."

reach
"The β-catenin destruction complex is composed of Axin, APC, CK1α and GSK3β, and is responsible for phosphorylating the N-terminal serine and threonine residues of β-catenin 9."

rlimsp
"It is well known that serine-phosphorylation of beta-catenin by the Axin-glycogen synthase kinase (GSK)-3beta complex targets beta-catenin for ubiquitination-degradation, and mutations at critical phosphoserine residues stabilize beta-catenin and cause human cancers."