沉降系數(shù)：70S（原核生物核糖體特征，區(qū)別于真核生物的 80S 核糖體）。

亞基組成：

蛋白質(zhì)合成：以 mRNA 為模板，通過(guò) tRNA 攜帶氨基酸，在核糖體上通過(guò)翻譯過(guò)程合成多肽鏈。

分子識(shí)別：小亞基負(fù)責(zé)讀取 mRNA 序列，大亞基催化肽鍵形成，兩者協(xié)同完成密碼子 - 反密碼子配對(duì)、氨基酸連接和肽鏈延伸。

原核特異性：70S 核糖體是原核生物的標(biāo)志，其結(jié)構(gòu)與真核生物 80S 核糖體（由 40S 和 60S 亞基組成）存在差異，是抗生素（如鏈霉素、氯霉素）的靶向位點(diǎn)。

高效性：大腸桿菌核糖體在適宜條件下每秒可聚合約 20 個(gè)氨基酸，滿(mǎn)足細(xì)菌快速生長(zhǎng)的需求。

Sedimentation Coefficient: 70S (characteristic of prokaryotic ribosomes, distinguishing them from eukaryotic 80S ribosomes).

Subunit Composition:

Protein Synthesis: Uses mRNA as a template, carries amino acids via tRNA, and synthesizes polypeptide chains through translation on the ribosome.

Molecular Recognition: The small subunit reads the mRNA sequence, while the large subunit catalyzes peptide bond formation. Both subunits work together to facilitate codon-anticodon pairing, amino acid linking, and peptide chain elongation.

Prokaryotic Specificity: The 70S ribosome is a hallmark of prokaryotes. Its structural differences from eukaryotic 80S ribosomes (composed of 40S and 60S subunits) make it a target for antibiotics (e.g., streptomycin binding to 30S, chloramphenicol binding to 50S).

High Efficiency: Under optimal conditions, the E. coli ribosome can polymerize approximately 20 amino acids per second, meeting the rapid growth demands of bacteria.