title: Calpain-mediated cleavage of the cyclin-dependent kinase-5 activator p39 to p29.
abstract: The activity of cyclin-dependent kinase-5 (Cdk5) is tightly regulated by binding of its neuronal activators p35 and p39. Upon neurotoxic insults, p35 is cleaved to p25 by the Ca(2+)-dependent protease calpain. p25 is accumulated in ischemic brains and in brains of patients with Alzheimer's disease. p25 deregulates Cdk5 activity by causing prolonged activation and mislocalization of Cdk5. It is unknown whether p39, which is expressed throughout the adult rat brain, is cleaved by calpain, and whether this contributes to deregulation of Cdk5. Here, we show that calpain cleaved p39 in vitro, resulting in generation of a C-terminal p29 fragment. In vivo, p29 was generated in ischemic brain concomitant with increased calpain activity. In fresh brain lysates, generation of p29 was Ca(2+)-dependent, and calpain inhibitors abolished p29 production. The Ca(2+) ionophore ionomycin and the excitotoxin glutamate induced production of p29 in cultures of cortical neurons in a calpain-dependent manner. Like p25, p29 was more stable than p39 and caused redistribution of Cdk5 in cortical neurons. Our data suggest that neurotoxic insults lead to calpain-mediated conversion of p39 to p29, which might contribute to deregulation of Cdk5.
authors.affiliation: Department of Pathology, Harvard Medical School and the Howard Hughes Medical Institute, Boston, Massachusetts 02115, USA.
authors.forename: Holger
authors.initials: H
authors.lastname: Patzke
authors.forename: Li-Huei
authors.initials: LH
authors.lastname: Tsai
mesh_terms: D000818:Animals; D015153:Blotting, Western; D001921:Brain / Q000378:metabolism; D019556:COS Cells; D002118:Calcium / Q000378:metabolism*; D002154:Calpain / Q000378:metabolism*; D002352:Carrier Proteins / Q000737:chemistry / Q000378:metabolism*; D051360:Cyclin-Dependent Kinase 5; D018844:Cyclin-Dependent Kinases / Q000737:chemistry* / Q000378:metabolism*; D004247:DNA / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D018698:Glutamic Acid / Q000378:metabolism; D006639:Histidine / Q000737:chemistry; D006801:Humans; D015759:Ionomycin / Q000494:pharmacology; D007476:Ionophores / Q000494:pharmacology; D007511:Ischemia / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D009419:Nerve Tissue Proteins / Q000737:chemistry / Q000378:metabolism*; D009474:Neurons / Q000166:cytology / Q000378:metabolism; D010957:Plasmids / Q000378:metabolism; D011485:Protein Binding; D014176:Protein Biosynthesis; D017434:Protein Structure, Tertiary; D051381:Rats; D017422:Sequence Analysis, DNA; D013997:Time Factors; D014158:Transcription, Genetic; D014162:Transfection
chemical_list: D002352:Carrier Proteins; C108298:Cdk5 activator p39; D007476:Ionophores; D009419:Nerve Tissue Proteins; C089495:neuronal Cdk5 activator (p25-p35); D018698:Glutamic Acid; D006639:Histidine; D015759:Ionomycin; D004247:DNA; D051360:Cyclin-Dependent Kinase 5; C495905:CDK5 protein, human; C495906:Cdk5 protein, mouse; C495907:Cdk5 protein, rat; D018844:Cyclin-Dependent Kinases; D002154:Calpain; D002118:Calcium