Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Molecular Miology of the Poliovirus

폴리오바이러스의 분자생물학

  • 최원상 (동국대학교 자연과학부 생화학전공)
  • Published : 1997.12.01
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Abstract

The poliovirus is a small, and non-enveloped virus. The RNA genome of poliovirus is continuous, linear, and has a single open reading frame. This polyprotein precursor is cleaved proteolytically to yield mature products. Most of the cleavages occur by viral protease. The mature proteins derived from the P1 polyprotein precursor are the structural components of the viral capsid. The initial cleavage by 2A protease is indirectly involved in the cleavage of a cellular protein p220, a subunit of the eukaryotic translation initiation factor 4F. This cleavage leads to the shut-off of cap-dependent host cell translation, and allows poliovirus to utilize the host cell machinery exclusively for translation its own RNA, which is initiated by internal ribosome entry via a cap-independent mechanism. The functional role of the 2B, 2C and 2BC proteins are not much known. 2B, 2C, 2BC and 3CD proteins are involved in the replication complex of virus induced vesicles. All newly synthesized viral RNAs are linked with VPg. VPg is a 22 amino acid polypeptide which is derived from 3AB. The 3C and 3CD are protease and process most of the cleavage sites of the polyprotein precursor. The 3C protein is also involved in inhibition of RNA polymerase II and III mediated transcription by converting host transcription factor to an inactive form. The 3D is the RNA dependent RNA polymerase. It is known that poliovirus replication follows the general pattern of positive strand RNA virus. Plus strand RNA is transcribed into complementary minus strand RNA that, in turn, is transcribed for the synthesis of plus strand RNA is transcribed into complementary minus strand RNA that, in turn, is transcribed for the synthesis of plus strand RNA strands. Poliovirus RNA synthesis occurs in a membranous environment but how the template RNA and proteins required for RNA replication assemble in the membrane is not much known. The RNA requirements for the encapsidation of the poliovirus genome (packaging signal) are totally unknown. The poliovirus infection cycle lasts approximately 6 hours.

폴리오바이러스는 바이러스들 중에서도 특히 커기가 작은 바이러스로서 피막(coat)을 둘러싸는 막(envelop) 이 없다. 폴리오바이러스는 (+) 가닥의 단일 RNA 게놈을 갖는데 이는 한 개의 해독판 (open reading frame)을 이용하여 다단백전구체를 만든 후 바이러스 자체의 단백질분해효소에 의해 스스로 잘라져서 궁극적으로느 특이한 기능을 갖는 여러개의 단백질이 된다. P1 다단백질전구체로부터 만들어지는 단백질들은 바이러스의 피막을 구성하는 성분이다. 단백질분해효소인 2A에 의한 최초의 절단은 구조단백질 P1 전구체와 구조단백질이 아닌 P2-P3간을 분리시켜준다. 단백질분해효소 2A는 진핵세포 판독개시인자(translation initiation factor) 4F의 한 subunit인 숙주단백질 p220의 절단에 간접으로 참여한다. 이 단백질의 절단은 캡(cap)에 의존하는 숙주세포의 대부분의 판독을 차단하게 되며 이는 판독에 사용되는 숙주세포의 모든 기구들을 캡에 의존하지 않는 폴리오바이러스 NA 특유의 판독을 위해 전적으로 사용할 수 있게 해준다. 2B, 2C, 2BC 단백질의 기능에 대해서는 많이 알려져 있지 않다. 2B, 2C, 2BC와 3CD 단백질들은 바이러스로 인해 만들어지는 소낭(vesicle)의 복제복합체에 함유되어 있으므로 바이러스의 RNA 복제시 중요한 역할을 함을 암시해준다. 새로이 만들어진 모든 바이러스 RNA는 VPg와 공유결합으로 연결되어 있다. VPg는 3AB로부터 만들어진 아미노산 22개 짜리의 폴리펩타이드이다. 3C와 3CD는 단백질분해소로 다단백질 전구체의 대부분의 절단부위를 잘라준다. 3C단백질은 숙주의 전사인자를 불활성화 시킴으로써 RNA polymer II와 III에 의한 전사를 저해한다. 3D는 RNA의존선RNA 중합효소이다. 폴리오바이러스는 (+)가닥 RNA 바이러스의 일반적인 복제양식을 따른다. 즉 (+) 가닥 RNA는 이와 상보적인 (-)가닥 RNA로 전사되고 이는 다시 (+)가닥 RNA의 합성을 위한 주형으로 사용된다. 폴리오바이러스의 RNA 합성은 세포내막에서 일어나는 데 RNA 복제에 요구되는 주형 RNA와 이때 필요한 단백질들이 어떤 방법으로 세포내막에서 모일 수 있는지는 아직 밝혀진 것이 적다. 바이러스입자의 형성은 세포막의 RNA 복제가 들어가는 데 피막단백질이 (+)가닥 RNA을 인식하는 표지 즉 packaging singal에 대해서는 거의 알려져 있지 않다. 폴리오바이러스 감염 후 첫 바이러스입자가 만들어지기 까는 약 6시간이 소요된다.

Keywords

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