Termination of protein biosynthesis requires class I releasefactors (R terjemahan - Termination of protein biosynthesis requires class I releasefactors (R Bahasa Indonesia Bagaimana mengatakan

Termination of protein biosynthesis

Termination of protein biosynthesis requires class I release
factors (RFs) to recognize stop codons (RF1 and RF2 in
Bacteria, aRF1 in Archaea and eRF1 in Eukarya). RFs are
polypeptides which bind to the aminoacyl (A) site of the ribosome when they recognize a stop codon (for reviews, see [1^
4]). They mimic tRNAs. This led to the suggestion that there
exists a peptide anticodon in RFs which reads stop codons
[1,3]. Recently Nakamura and his colleagues identi¢ed a tripeptide Pro-Ala-Thr in RF1, which recognizes UAG and
UAA and a tripeptide Ser-Pro-Phe in RF2 which recognizes
UGA and UAA [5]. It is known that the conventional eRF1s
function as omnipotent RFs decoding all three stop codons
UAG, UAA, and UGA. In this case some residues probably
recognize G or A in the second position of a stop codon and other residues G or A in the third position. However, the two
processes of recognition cannot be achieved independently of
each other because the tryptophan codon UGG is not mistaken for a stop codon. This raises the question of the mechanism by which UGG is discriminated.
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Penghentian sintesis protein memerlukan kelas aku melepaskanfaktor-faktor (RFs) untuk mengenali berhenti codons (RF1 dan RF2 diBakteri, aRF1 di Archaea dan eRF1 di Eukarya). RFs adalahakan Proline yang mengikat ke aminoacyl (sebuah) situs ribosom ketika mereka mengenali kodon berhenti (untuk ulasan, lihat [1 ^4]). mereka meniru tRNAs. Hal ini menyebabkan saran bahwa adaada anticodon peptida di RFs yang berbunyi berhenti codons[1,3]. baru saja Nakamura dan memenuhi lowon rekan nya ¢ ed tripeptide Pro-Ala-Thr di RF1, yang mengakui UAG danUAA dan tripeptide Ser-Pro-Phe di RF2 yang mengakuiUGA dan UAA [5]. Diketahui bahwa eRF1s konvensionalberfungsi sebagai Mahakuasa RFs decoding semua tiga berhenti codonsUAG, UAA, dan UGA. Dalam hal ini beberapa residu mungkinmengenali G atau A di posisi kedua kodon berhenti dan residu lainnya G atau A di posisi ketiga. Namun, duaproses pengakuan tidak dapat dicapai secara independensatu sama lain karena kodon triptofan UGG tidak salah untuk kodon berhenti. Hal ini menimbulkan pertanyaan tentang mekanisme yang UGG diskriminasi.
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