Retroviruses
- 최초 등록일
- 2010.07.26
- 최종 저작일
- 2010.07
- 49페이지/ MS 파워포인트
- 가격 3,000원
소개글
Retroviruses
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본문내용
ASSEMBLY of a new virion takes place at the cell membrane. Three kinds of protein go into making the particle: the envelope protein (actually a complex of two or three units, each unit made up of an external molecule associated with a molecule embedded in the membrane) and two precursor proteins of differing length (1). As the proteins aggregate at the cell membrane, it starts to pinch off. One precursor molecule draws two strands of viral RNA into the nascent virion, and a protease, or protein-cleaving enzyme, cuts itself free of a long precursor (2). The protease completes the formation of the virion by cleaving other enzyme – an integrase, a DNA polymerase and ribonuclease, and more protease – from the long precursors and then cutting each of the precursor into four pieces. One piece (p17) remains attached to the patch of cell membrane that surrounds the completed particle (3), and the other three pieces (p24, p7 and p9) form a bullet-shaped inner core.
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