Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Studies on the phosphotyrsine-proteins in the rat cerbellar PSD fraction

흰쥐 소뇌 연접후치밀질내 phosphotryrosine 함유 단백질에 대한 연구

  • 전일수 (동국대학교 의과대학 해부학교실) ;
  • 함소희 (동국대학교 의과대학 해부학교실) ;
  • 고복현 (동국대학교 의과대학 해부학교실)
  • Published : 1997.09.01
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Abstract

The signal transduction through tyrosine kinases play important roles in neuronal development and synaptic regulation. We carried out immunoblot analyses to study tyrosine=phosphorylated proteins in the rat cerebellar postsynaptic density (PSD), a protein-rich cytoskeletal specialization underlying beneath the postsynaptic membrane. The overall protein composition of cerebellar PSD fractions was similar to that of the forebrain’s and only a few bands were different in Coomassie stain. Immunoblot analyses with phosphtyrosine-specific antiboy (4G10) showed that there are many more tyrosine-phosphorylated proteins in the cerebellar PSD than in the forebrain PSD. Interestiingly, a major phosphotyrosine signals in cerebellar PSD fractions was associated with a 50 kD molecular size, named as PSD-50. Migration of PSD-50 coincided with that of $\alpha$CaMKII and remained in the pellet fraction after N-octylglucoside extraction. These results indicate that tyrosine phosphorylation is important in cerebellar synaptic regulation and that the PSD-50 may be same as $\alpha$CaMKIIor a new protein which is a major substrate of tyrosine kinase.

tyrosine 인산화효소계를 통한 신호전달은 신경의 발생과 연접환성조절에 중요한 역할을 한다. 흰쥐 소뇌의 연접후치밀질에 존재하는 tyrosine 함유 당백질들을 조사하기 위하여 immunoblot 분석을 한 결과, 소뇌 연접후치밀질의 전반적인 단백질조성은 전뇌와 비슷하였다. phosphotyrosine 특이성 항체로, immunobolot 한 결과 소뇌의 주된 tyrosine 인산화 단백질은 50 kD 크기의 새로운 단백질이었다. PSD-50로 명명한 이 단백질은 SDS-PAGE에서 $\alpha$CaMKII와 같은 위치에 이동하였다. 그러나 소뇌에는 전뇌에 비하여 적은량의 $\alpha$CaMKII가 존재함에도 불구하고 전뇌보다 더 강한 phosphotyrosine immunoblot signal을 보이는 것으로 보아 PSD-50는 아마도 $\alpha$CaMKII와는 다른 단백질로 추정된다.

Keywords

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