真核生物(鼠肝)核糖体的组成 Ribosome Small subunit Large Subunit Sedimentation coefficient 80S 40S 60S Mass(kD) 4220 1400 2820 Major rnas 18S(1874baes)28(4718 bases Minor rnas 5.8S(160 bases 5s(120 bases RNA mass(kD) 2520 700 1820 RNA 60 50% 65% proportion Protein number 33 polypeptides 49 polypeptides Protein maSs(kD) 1700 700 1000 Protein 40% 50% 35% proportion真核生物(鼠肝)核糖体的组成 Ribosome Small Subunit Large Subunit Sedimentation coefficient 80S 40S 60S Mass(kD) 4220 1400 2820 Major RNAs 18S (1874 bases) 28S (4718 bases) Minor RNAs 5. 8S (160 bases) 5S (120 bases) RNA mass(kD) 2520 700 1820 RNA proportion 60% 50% 65% Protein number 33 polypeptides 49 polypeptides Protein mass(kD) 1700 700 1000 Protein proportion 40% 50% 35%