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細(xì)胞和卵巢黃體細(xì)胞:雄激素和雌激素 骨骼肌(肌質(zhì)網(wǎng)):鈣庫(kù) 視網(wǎng)膜色素上皮細(xì)胞(髓樣體):利用光能 sER 四 . 內(nèi)質(zhì)網(wǎng)的功能 (一) 粗面內(nèi)質(zhì)網(wǎng)的功能 ▲蛋白質(zhì)的合成與轉(zhuǎn)運(yùn) ▲脂類合成 ① 分泌蛋白的合成 : SRP: signal recognition particle 信號(hào)肽識(shí)別顆粒 SRP SRPR 信號(hào)肽 核糖體復(fù)合體 移位子 錨泊蛋白 信號(hào)片 signal patches Two ways that a sorting signal can be built into a protein. (A)The signal resides in a single discrete stretch of amino acid sequence, called a signal peptide, that is exposed in the folded protein. (B) A signal patch can be formed by the juxtaposition of amino acids from regions that are physically separated before the protein folds. 信號(hào)肽 Signal peptides 信號(hào)肽酶(內(nèi)質(zhì)網(wǎng)膜內(nèi)表面) 肽鏈繼續(xù)合成