Cleavage of p-STK4 (p-MST1) by caspase 3

Stable Identifier
Homo sapiens
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Cytosolic caspase 3 cleaves p-STK4 (p-MST1) to yield an active animo-terminal fragment (p-STK4/N) and a carboxy-terminal fragment (p-STK4/C) (Graves et al. 1998; Lee et al. 2001). The association of p-STK4 (p-MST1) with other proteins at the time of its cleavage by caspase has not been studied experimentally. Here, it is inferred to be dimerized and in a complex with SAV1 because that is the form of the molecule that becomes phosphorylated and phosphorylation appears normally to precede caspase cleavage. The effect of the cleavage is to increase the kinase activity of p-STK4 (p-MST1).

Literature References
PubMed ID Title Journal Year
11278283 MST, a physiological caspase substrate, highly sensitizes apoptosis both upstream and downstream of caspase activation

Tsubuki, S, Yajima, N, Lee, KK, Ohyama, T, Yonehara, S

J Biol Chem 2001
9545236 Caspase-mediated activation and induction of apoptosis by the mammalian Ste20-like kinase Mst1

Ambrose, DM, Krebs, EG, Han, DK, Gotoh, Y, Clark, EA, Draves, KE, Chernoff, J, Wright, M, Graves, JD

EMBO J 1998
Catalyst Activity

cysteine-type endopeptidase activity of Caspase-3 [cytosol]

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