Dysbindin-1, a Schizophrenia-related protein, functionally interacts with the DNA-dependent protein kinase complex in an isoform-dependent manner

Satoko Oyama, Hidekuni Yamakawa, Noboru Sasagawa, Yoshio Hosoi, Eugene Futai, Shoichi Ishiura

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

DTNBP1 has been recognized as a schizophrenia susceptible gene, and its protein product, dysbindin-1, is down-regulated in the brains of schizophrenic patients. However, little is known about the physiological role of dysbindin-1 in the central nervous system. We hypothesized that disruption of dysbindin-1 with unidentified proteins could contribute to pathogenesis and the symptoms of schizophrenia. GST pull-down from human neuroblastoma lysates showed an association of dysbindin-1 with the DNA-dependent protein kinase (DNA-PK) complex. The DNA-PK complex interacts only with splice isoforms A and B, but not with C. We found that isoforms A and B localized in nucleus, where the kinase complex exist, whereas the isoform C was found exclusively in cytosol. Furthermore, results of phosphorylation assay suggest that the DNA-PK complex phosphorylated dysbindin-1 isoforms A and B in cells. These observations suggest that DNA-PK regulates the dysbindin-1 isoforms A and B by phosphorylation in nucleus. Isoform C does not contain exons from 1 to 6. Since schizophrenia-related single nucleotide polymorphisms (SNPs) occur in these introns between exon 1 and exon 6, we suggest that these SNPs might affect splicing of DTNBP1, which leads to impairment of the functional interaction between dysbindin-1 and DNA-PK in schizophrenic patients.

Original languageEnglish
Article numbere4199
JournalPloS one
Volume4
Issue number1
DOIs
Publication statusPublished - 2009 Jan 14
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

Fingerprint

Dive into the research topics of 'Dysbindin-1, a Schizophrenia-related protein, functionally interacts with the DNA-dependent protein kinase complex in an isoform-dependent manner'. Together they form a unique fingerprint.

Cite this