MAKALAH
BIOSINTESIS PROTEIN
Diajukan untuk memenuhi salah satu tugas Mata Kuliah Biokimia pada Program D3 Kebidanan STIKes Bina Putera Banjar
Oleh : ANI AFIANTI EKA WAHYUNI INTAN RAHMAWATI IRAWATI MAYANG PITALOKA
SEKOLAH TINGGI ILMU KESEHATAN BINA PUTERA BANJAR
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PROGRAM STUDI D3 KEBIDANAN TAHUN 2012
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KATA PENGANTAR
Alhamdulilah puji syukur penulis ucapkan kehadirat Allah SWT, karena atas berkat rahmat dan petunjuknya penulis dapat menyelesaikan Makalah biokimia dengan dengan judul judul “Biosint “Biosintesis esis Protein Protein”” dapat dapat selesai selesai tepat tepat pada pada waktu waktu yang yang telah telah ditentukan. Penulis Penulis menguc mengucapk apkan an terima terima kasih kasih yang sebanya sebanyak-b k-bany anyakn aknya ya kepada kepada dosen mata kuliah Biokimia serta para sahabat yang telah membantu penulis selama penulisan penulisan Makalah Makalah ini. Di samping itu, penulis juga mengucapkan terima kasih kepada semua pihak yang telah membantu membantu dalam pembuatan pembuatan Makalah Makalah ini, penulis juga mengharapkan mengharapkan kritik dan saran yang sifatnya membangun membangun untuk kesempurnaan kearah kearah yang yang lebih lebih baik. baik. Harapan Harapan penulis penulis semoga semoga Makalah Makalah ini member memberii manfaat manfaat kepada penulis khususnya dan pembaca umumnya.
Pekanbaru,
Januari 2012
Penulis
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DAFTAR ISI
......... ...... ...... ...... ...... ...... ....... ....... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ........ .......... .......... .......... ..... KATA PENGANTAR ......
i
......... ...... ...... ...... ...... ...... ....... ....... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ........ .......... ......... ......... ......... .... DAFTAR ISI ......
ii
BAB BAB I PENDAH PENDAHUL ULUAN UAN ...... ......... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ....... ....... ...... ...... .....
1
A.......................................................................................................Latar Belakan Belakang g ...... ......... ...... ...... ...... ...... ...... ...... ...... ....... ....... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ....... ......
1
B.......................................................................................................Rum usan usan Masalah Masalah ........ ........... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ....... ....... ...... ...... ...... ...... ...... ...... ...... ...... ....... ........ ....
2
C.......................................................................................................Tujua n Penulis Penulisan an ........ ........... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ........ .......... .......... ........ ...
2
D........................................................................................................... Manf
aat Penuli Penulisan san ..... ........ ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ........ .......... .......... .......... .......... ....... ..
3
BAB BAB II PEMBAH PEMBAHASA ASAN N ...... ......... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ....... ......... .......... .......... .......... .......
4
A........................................................................................................... Protei
n ...... ......... ...... ...... ....... ....... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ........ .......... ....... ..
4
B.......................................................................................................Peng ertian ertian Biosinte Biosintesis sis ........ ........... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ....... ....... ...... ........ .......... .......
5
C.......................................................................................................Biosi ntesis ntesis Protein Protein ...... .......... ....... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ........ .......... ........ ...
6
D........................................................................................................... Taha
p Utama Utama Sintesis Sintesis Protein Protein ....
8
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E.......................................................................................................Biosi ntesis Protein ............. ................... ............ ............ ............ ............ ............ ............ ............ ............ .................... ................ .. BAB III KESIMPULAN ................................................................................... 22 DAFTAR PUSTAKA
13
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BAB I PENDAHULUAN
A. Lata Latarr Bela Belaka kang ng
Protein Merupakan Senyawa Organik Kompleks Yang Memiliki Memiliki Bobot Moleku Molekull Yang Yang Sangat Sangat Tingg Tinggii Yang Yang Terdiri Terdiri Dari Dari Monom Monomer-M er-Mono onomer mer Asam Asam Amino Yang Saling Berhuungan Satu Sama Lain. Protein memiliki peranan penting dalam kehidupan kehidupan manusia dan juga mahkluk mahkluk hidup yang lain karena protein merupakan merupakan unsur utama dalam tubuh mahkluk mahkluk hidup. hidup. Pada sebagian sebagian besar jaringan jaringan tubuh, tubuh, protein merupakan komponen komponen terbesar kedua setelah air. Diperkirakan 50% berat kering sel dalam jaringan hati dan daging terdiri dari protein. Sedang Sedangkan kan dalam tenunan tenunan daging daging segar segar sekitar 20%. Protein Protein ditemukan ditemukan dalam berbagai jenis bahan makanan, mulai dari kacang-kacangan, biji-bijian, daging unggas, unggas, seafood, seafood, daging ternak, sampai produk susu. Buah dan sayuran member memberikan ikan sedikit sedikit protein protein.. Pemiliha Pemilihan n sumber sumber protein protein ini harus harus bijaksan bijaksana, a, karena banyak makanan yang tinggi protein juga tinggi lemak dan kolesterol. Fungsi dari protein itu sendiri secara garis besar dapat dibagi ke dalam dua kelompok besar, yaitu sebagai bahan struktural dan sebagai mesin yang bekerja pada tingkat tingkat moleku molekular lar Kebanya Kebanyakan kan protein protein merupa merupakan kan enzim atau atau subu subuni nitt enzi enzim. m. ). Jeni Jeniss protein lain berperan berperan dalam fungsi struktural struktural atau mekanis, mekanis, seperti misalnya misalnya protein yang membentuk membentuk batang dan sendi sitoskeleton. sitoskeleton. Protein terlibat dalam
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sistem kekebalan (imun) sebagai antibodi, antibodi, sistem kendali dalam bentuk hormon, bentuk hormon, sebagai komponen penyimpanan (dalam biji) dan juga dalam transportasi hara.
B. Rumu Rumusa san n Mas Masal alah ah
Berdasarkan latar belakang diatas maka dapat diambil rumusan masalah sebagai berikut : 1) Apa yang yang dimak dimaksud sud dengan dengan protein protein?? 2) Apa yang yang dimak dimaksud sud deng dengan an biosin biosintesi tesis? s? 3) Apa yang yang dimak dimaksud sud denga dengan n biosinte biosintesis sis protein? protein? 4) Jelaskan Jelaskan tahap tahapan-t an-tahap ahapan an biosint biosintesis esis protein protein??
C. Tu Tuju juan an Pen Penul ulis isan an 1. Tujuan Um Umum
Adapu Adapun n tujua tujuan n umum umum penu penulis lis dala dalam m maka makala lah h ini ini adal adalah ah untuk untuk mengetahui lebih jelas tentang Biosintesis Protein. 2. Tu Tuju jua an Kh Khusu usus
a. Untuk Untuk meng mengeta etahui hui tentan tentang g penge pengertia rtian n protein protein??
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D. Manfaat Penulisan
Adap Adapun un manfaa manfaatt dari dari maka makala lah h ini adala adalah h untu untuk k menin meningk gkatk atkan an dan dan memperl memperluas uas penget pengetahua ahuan n penulis penulis khususn khususnya, ya, dan umumn umumnya ya untuk untuk semua semua mahasisw mahasiswaa Jurusan Jurusan Kebida Kebidanan nan STIKe STIKess Bina Bina Putera Putera Banjar Banjar tentang tentang bakteri bakteri biosintesis biosintesis protein. protein.
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BAB II PEMBAHASAN
A. Protein
Protein (asal kata protos dari bahasa Yunani yang berarti "yang paling utama") utama") adalah adalah senyaw senyawaa organik organik kompl kompleks eks berbob berbobot ot moleku molekull tinggi tinggi yang merupakanpolimer dari monomer-monomer asam amino yang dihubungkan satu sama sama lain lain deng dengan an ikata ikatan n pept peptida ida.. Molek Molekul ul prot protein ein meng mengand andun ung g karb karbon on,, hidrogen, oksigen,nitrogen dan kadang kala sulfur serta fosfor. Protein berperan penting dalam struktur struktur dan dan fungsi fungsi semua sel makhluk makhluk hidup hidup dan dan virus. virus. Kebanyakan protein merupakan enzim atau subunit enzim. Jenis protein lain berperan dalam fungsi struktural atau mekanis, seperti misalnya protein yang membentuk batang dan sendi sitoskeleton. Protein terlibat dalam sistem kekeba kekebalan lan (imun) (imun) sebagai sebagai antibo antibodi, di, sistem sistem kendali kendali dalam dalam bentuk bentuk hormo hormon, n, sebagai komponen penyimpanan (dalam biji) dan juga dalam transportasi hara. Sebagai salah satu sumber gizi, protein berperan sebagai sumber asam amino bagiorganisme bagiorganisme yang yang tidak tidak mampu mampu membentu membentuk k asam amino tersebut tersebut (heterotr (heterotrof). of).
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Biosintesis protein alami sama dengan ekspresi genetik. Kode genetik yang dibawa DNA ditranskripsi menjadi RNA, yang berperan sebagai cetakan bagitranslasi bagitranslasi yang dilakukan dilakukan ribosom. ribosom. Sampai Sampai tahap ini, protein masih "mentah", hanya tersusun dari asam amino proteinogenik. Melalui mekanisme pascatranslasi, pascatranslasi, terbentuklah terbentuklah protein yang memiliki memiliki fungsi penuh penuh secara biologi. biologi.
B. Pengertian Biosintesis
Bios Biosint intesi esiss prote protein in merup merupak akan an poli polime merr yang yang
berfu berfung ngsi si seba sebaga gaii
penyusun penyusun protoplasma dan struktur tubuh lainnya. Protein dapat berupa enzim atau hormon, antara alin sebagai penyusun pigmen pada tumbuhan. Penyusun hemoglobin dalam darah manusia dan hewan. Serta penyusunan serum dalam plasma. Jenis Jenis dan rangkain rangkain yang menyususn menyususn protein protein berbeda berbeda antara antara protein protein yang satu dengan protei yang lainnya. Mekanisme sisntesis protein terjadi melalui dua tahap tahap utama utama yaitu yaitu transkr transkripsi ipsi dan translas translasi. i. Sintesis Sintesis protein protein merupa merupakan kan proses yang sangat kompleks. kompleks. Informasi Informasi genetik yang dikode dikode pada susunan susunan basa DNA DNA diterjemah diterjemah kedalam kedalam 20 macam asam asam amino. amino. Transk Transkrip rip adalah adalah percetak percetakan an mRNA mRNA oleh oleh DNA. DNA. Sedang Sedangkan kan translas translasii
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Biosintesis protein yang terjadi dalam sel merupakan reaksi kimia yang komplek komplekss dan melibat melibatkan kan beberap beberapaa senyawa senyawa penting penting,, terutam terutamaa DNA dan RNA. RNA.mo mole leku kuk k DNA DNA meru merupak pakan an ranta rantaii polinu polinukl kleu eutid tidaa yang yang memp mempun unya yaii beberapa beberapa jenis basapurin basapurin dan piramidin, piramidin, dan berbentuk berbentuk heliks ganda. ganda. Deng Dengan an demik demikian ian akan akan terja terjadi di helik helikss gand ganday ayan ang g baru baru dan dan pros proses es terbentunya molekul DNA baru ini disebut replikasi, urutan basa purin dan piramidin piramidin pada molekul molekul DNA menentukan menentukan urutan asam amino dalam pembentukan pembentukan protein. protein. Peran dari DNA itu sendri sebagai pembawa pembawa informasi informasi genetic genetic atau sifat-sifa sifat-sifatt keturu keturunan nan pada pada seseora seseorang ng . dua dua tahap tahap pemben pembentuk tukan an protein: protein: 1)
Tahap ahap per perta tama ma dis diseb ebut ut tra trans nskr krip ipsi si,, yait yaitu u pemb pemben entu tuka kan n mole moleku kull RNA RNA
sesuai pesan yang diberikan oleh DNA. 2)
Tahap ahap ked kedua ua dis diseb ebut ut tra trans nsla lasi si,, yait yaitu u mole moleku kull RNA RNA men mener erje jema mahk hkan an
informasi genetika kedalam proses pembentukan protein. Biosintesis protein terjadi dalam ribososm, yaitu suatu partikel yang terd terdap apat at dala dalam m sito sitopl plas asma ma r RNA RNA bers bersam amaa deng dengan an prot protei ein n meru merupa paka kan n komponen yang membentuk ribosom dalam sel, perananya dalam dalam sintesis
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guanin-urasil-g guanin-urasil-guanin. uanin. kodon kodon yang menunjuk menunjuk asam amino yang sama disebut disebut sinonim, misalnya CAU dan CAC adalah sinonim untuk histidin. perbedaan antara antara sinonim sinonim tersebu tersebutt pada pada umumny umumnyaa adalah adalah basa pada pada kedudu kedudukan kanket ketiga iga misalnya GUU,GUA,GUC,GUG GUU,GUA,GUC,GUG.. .. Bagian molekut t RNA yang penting dalam biosintesis protein ialah lengan asam amino yang mempunyai fungsi mengikat molekul asam amino terte tertentu ntu dalam dalam lipat lipatan an anti anti kodo kodon. n. lipata lipatan n anti anti kodo kodon n memp mempun unya yaii fung fungsi si menemukan kodon yang menjadi pasangannya dalam m RNA yang tedapat dalam dalam riboso ribosom. m. pada pada pros prosese ese biosin biosinte tesis sis prote protein, in, tiap tiap mole moleku kuln ln t RNA RNA membawa satu molekul asam amino masuk kedalam ribosom. pembentukkan ikatan asam amino dengan t Rna ini berlangsung dengan bantuan enzim amino asli t RNA sintetase dan ATP melalui dua tahap reaksi: 1
Asam aminon dengan enzim dan AMP membentuk kompleks
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memerlukan memerlukan Mg2+ sebagai kofaktor yang masing- masing spesifik bagi satu asam amino dan bagi tRNA-nya. Tahap 2 : Inisiasi Rantai Polipeptida RNA pembawa pesan yang membawa sandi bagi polipeptida yang akan dibentuk diikat oleh subunit ribosom yang berukuran lebih kecil, diikuti oleh inisiasi asam amino yang diikat oleh tRNA-nya membentuk suatu kompleks inisiasi. inisiasi. tRNA tRNA asam asam amin amino o peng pengin inis isia iasi si ini ini berp berpas asan anga gan n deng dengan an trip triple lett nukleutida spesfik atau kodon pada mRNA yang menyandi permulaan rantai polipeptida. polipeptida. Dalam proses ini memerlukan memerlukan guanosin guanosin trifosfat (GTP), (GTP), dilangsungkan oleh tiga protein sitosol spesifik yang dinamakan faktor dinamakan faktor inisiasi inisiasi.. Inis Inisia iasi si pada pada prok prokar ario ioti tik k meme memerl rluk ukan an : (1) (1) subu subuni nits ts 30S, 30S, yang yang mengandung RNA ribosomal 16S, (2) mRNA penyandi polipeptida yang akan dibentuk (3) N - formilmetionil- tRNAfmet pemula (4) serangkaian tiga protein
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deng dengan an bers bersam amaa aan n deng dengan an itu, itu, mole moleku kull GTP GTP yang yang teri terika katt deng dengan an IF-2 IF-2 dihidrolisis menjadi GDP dan fosfat yang segera dibebaskan. IF-3 dan IF-2 juga terlepas terlepas dari ribosom ribosom.. Sekaran Sekarang g didapat didapatkan kan ribososm ribososm 70S fungsion fungsional, al, yang yang dinamakan kompleks inisiasi yang mengadung mRNA dan N-formilmetionil tRNAfmet pada keseluruhan kompleks 70Sini dijamin oleh dua titik pengenal dan perlekatan. perlekatan. Pada titik pengenalan pengenalan antikodon antikodon triplet pada aminoasil aminoasil –tRNA pemula berpasanga basa secara antiparalel dengan dengan triplet kodon AUG didalam mRNA. mRNA. Titik perlekatan kedua kedua aminoasi-tRNA aminoasi-tRNA pemula ini adalah adalah pada sisi P ribosom. Ribosom mempunyai dua tempat untuk mengikat aminoasil-tRNA , aminoasil-tRNA , tempat aminoasil aminoasil atau tempat A, A, dan tempat peptidil atau tempat P . Masingmasing merupakan rangkaian subunit 50S dan 30S dalam posisi spesifik. Tahap 3 : Pemanjangan Rantai Rantai polipe polipeptid ptidaa diperpan diperpanjang jang oleh oleh pengik pengikata atan n kovale kovalen n unit unit asam
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Tahapa Tahapanny nnya, a, pertama pertama,, aminoas aminoasil-tR il-tRNA NA diikat diikat oleh oleh komple kompleks ks faktor faktor penunjang penunjang Tu, yang mengandung mengandung molekul molekul GTP terikat yang kemudian kemudian akan berikatan berikatan dengan dengan kompleks kompleks inisiasi 70S, bersamaam bersamaam dengan dengan itu GTP terhidrolisis dan kompleks Tu-GDP dibebaskan dari ribosom 70S. kompleks Tu-GTP dibentuk kembali dari kompleks Tu-GDP oleh semua faktor Ts dan GTP. Aminoasil-tRNA yang baru terbentuk tersebut akan terikat pada tempat aminoasil atau tempat tempat A. tahap tahap kedua, kedua, ikatan ikatan peptid peptidaa yang baru terbent terbentuk uk diant diantara ara asam asam amino amino yang yang tRNA tRNA-ny -nyaa terle terletak tak pada pada tempa tempatt A dan dan P pada pada ribosom yang terjadi melalui pemindahan gugus asil N-formilmetionion pemula dari tRNA-nya ke gugus amino asam amino yang baru memasuki tempat A, dengan dikatalisis oleh peptidil peptidil transferase transferase.. Terbentuk di peptidil tRNA pada tempa A dan sekarang tRNA fmet pemula yang telah “kosong” terikat pada tempat P. tahap ketiga, ribososm bergerak di sepanjang mRNA menuju ujung 3’-nya
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Term Termina inasi si polip polipep eptid tidaa didisy didisyara aratk tkan an oleh oleh satu satu dian diantar taraa tiga tiga triple triplett terminasi (UAA, UAG, dan UGA) dimana triplet tersebut tidak menyandi asam amino manapun. manapun. Sekali Sekali ribosom ribosom mencapai mencapai kodon terminasi, terminasi, ada tiga tiga faktor pengakhir pengakhir (terminasi) (terminasi) atau faktor pembebas, pembebas, yaitu protein R 1, R 2, dan S, yang kemudian turut menyebabkan (1) penguraian hidrolitik polipeptida dari ujung tRNA terakhir dan melepaskannya dalam bebtuk bebas, (2) pelepasan tRNA terakhir yang sekarang kosong dari tempat P, dan (3) dissosiasi ribosom 70S menjadi subunit 30S dan 50S nya siap untuk memulai rantai polipeptida yang baru. Tahap 5 : pelipatan dan pengolahan Untuk memperoleh bentuk aktifnya secara biologis, polipeptida harus mengalami pelipatan menjadi konfirmasi tiga dimensi yang benar. Sebelum dan sesudah sesudah pelipat pelipatan, an, polipe polipeptid ptidaa baru dapat dapat mengal mengalami ami pengol pengolahan ahan oleh oleh kerja kerja
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protein , gugus gugus amino pada residu terminal amino mengalami asetilasi setelah transkripsi, pada protein lain residu terminal karboksil dapat dimodifikasi. Terlepasnya urutan pemberi isyarat , beberapa protein dibuat dengan
urutan ekstra polipeptida, yang terdiri dari 15 sampai 30 residu pada ujung terminal amino, untuk mengarahkan protein sampai tujuan , didalam sel urutan pengisyarat pengisyarat akan akan dibebaskan oleh peptidase spesifik. guguss hidro hidroks ksil il resid residu u serin, serin, Fosfo Fosforila rilasi si Asam Asam Amino Amino Hidro Hidroksi ksi, gugu treonin, dan tirosin beberapa protein mengalami fosforilasi secara enzimatik
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Penambah Penambahan an Gugus Gugus Prostetik Prostetik , banyak banyak enzim enzim mengan mengandun dung g gugus gugus
prostetik yang terikat secara kovalen kovalen yang penting bagi aktivitasnya. aktivitasnya. Gugus Gugus prostetik ini juga diikat pada rantai polipeptida polipeptida setelah protein meninggalkan meninggalkan ribosom.contohnya, molekul biotin yang terikat secara kovalen pada asetil KoA karboksilase dan gugus heme sitokrom c. Pembentukan Jembatan Sulfida, beberapa beberapa protein yang dikeluarkan dikeluarkan
dari sel eukaryotik setelah mengalami pelipatan spontan menjadi konformasi seutuhnya, terikat menyilang secara kovalen oleh pembentukan gugus disulfida
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diterjemahkan menjadi protein
merupakan RNA rantai tunggal yang berisi pesan yang akan pada organisme prokaryotic prokaryotic pesan untuk beberapa protein mungkin dibawa atau terdapat polycistronic message pada satu satu rantai mRNA mRNA : polycistronic
setiap asam amino dikode oleh tiga nukleotida 43 ada 64 kombinasi berbeda
lebih dari cukup untuk mengkode 20 asam amino
hampir semua asam
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K
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kode genetic hampir universal untuk semua organisme, pengecualian
ditemukan pada mitokondria dan protozoa
pengecualian pengecualian yang sering ditemukan ditemukan pada bbrp organisme organisme STOP , mengkode Senelosistein
UGA
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struktur tRNA seperti daun waru
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RIBOSOME
Ribosome terdiri dari multiple protein dan RNA.
Untuk prokaryotic 70s terdiri dari : 50s dan 30s
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