第八章细胞核与染色体
第八章 细胞核与染色体
典型的细胞核结构图 DNA and associated proteins (chromatin doplasmic reticulum nucleolus 像鲁 centrosome intermediate microtubule filaments Confocal microscopy section of a cell nuclear pore nuclear lamina nucleus in interphase outer nuclear membrane 1 um inner nuclear membrane nuclear envelope
典型的细胞核结构图 Confocal microscopy section of a cell nucleus in interphase
第一节核被膜与核孔复合物 CELL NUCLEUS 、核被膜 Aeolus tar membra (nuclear ”, envelop) 2 Abby Marsh
第一节 核被膜与核孔复合物 一、核被膜 (nuclear envelop)
(一)结构构成 核被膜由内外两层平 Outer membrane 行但不连续的单位 Inner membrane 膜构成。面向核质 Nucleoplasm 的那层膜被称作内 Nucleolus (层)膜( Inner Chromat nuclear membrane),面 Nuclear envelope 向胞质的另一层膜 Pore in nuclear 称为外(层)核膜 envelope outer nuclear membrane
(一)结构构成 核被膜由内外两层平 行但不连续的单位 膜构成。面向核质 的那层膜被称作内 (层)膜(inner nuclear membrane),面 向胞质的另一层膜 称为外(层)核膜 ( outer nuclear membrane )
两膜之间的透明空 隙称为核周间隙 (perinuclear .s Nucleus. space)或核周池 RER perinuclear dInner membrane of cisternae nuclear envelope Outer membrane of nuclear envel
两膜之间的透明空 隙称为核周间隙 (perinuclear space)或核周池 (perinuclear cisternae)
外核膜可以看作是糙面内 质网的一个特化区域 紧贴内核膜内表面有 层致密的纤维网络结构, 即核纤层。内外核膜在 某些部位相互融合形成 环状开口,称为核孔 ( nuclear pore),核孔 Nuclear membrane consist of an inner 周围的核膜特称为孔膜 space between them, The outer 区( pore membrane membrane is occasionally continuous with domain the endoplasmic reticulum and is studded with ribosomes at the outside' surface
外核膜可以看作是糙面内 质网的一个特化区域。 紧贴内核膜内表面有一 层致密的纤维网络结构, 即核纤层。内外核膜在 某些部位相互融合形成 环状开口,称为核孔 (nuclear pore),核孔 周围的核膜特称为孔膜 区(pore membrane domain)。 Nuclear membrane consist of an inner and outer membrane with a perinuclear space between them. The outer membrane is occasionally continuous with the endoplasmic reticulum and is studded with ribosomes at the 'outside' surface
二)核被膜在细胞周期中的崩解与装配 个成熟的卵母细 胞所储存的原料 可供形成103~104 个细胞核 Interphase Nuclear envelope structure and function in living cells
(二)核被膜在细胞周期中的崩解与装配 一个成熟的卵母细 胞所储存的原料 可供形成103 ~104 个细胞核。 Nuclear envelope structure and function in living cells
核孔复合物( nuclear pore complex, NPC) 转录功能活跃的细胞,其 核孔复合体数量较多 Cytoplasm N_S-Bearng mport Substrate Fiaments <anchen Nudear Enve cge Karyopherin NES-Bagrino Export Substane Nucleus
二、核孔复合物(nuclear pore complex,NPC) 转录功能活跃的细胞,其 核孔复合体数量较多
Nudear membrane embedded in ice lear membrane embedded in ice partially freeze dried partially freeze dried
Nuclear membrane embedded in ice; partially freeze dried. Nuclear membrane embedded in ice; partially freeze dried
(一)结构模型 核孔复合物主要有以下4种结构 组分: Cytoplasmic Filament ①胞质环( cytoplasmic ring) Central Plug Cytoplasmic Ring ②核质环( nuclear ring)/核篮 Spake/ outer Nuclear (nuclear basket) Membrane ③辐( spoke) Lumen Nuelear 柱状亚单位( column subunit Inner Nuclear 腔内亚单位( luminal Nudear Ring Membrane subunit Baske Filament Nuclea 环带亚单位( annular Basket subunit Terminal Ring ④栓( central plug)/中央颗粒 (central granule Figure 3. A Cut-Away Model of an NPC
(一)结构模型 核孔复合物主要有以下4种结构 组分: ①胞质环(cytoplasmic ring) ②核质环(nuclear ring)/核篮 (nuclear basket) ③辐(spoke) 柱状亚单位(column subunit) 腔内亚单位(luminal subunit) 环带亚单位(annular subunit) ④栓(central plug)/中央颗粒 (central granule)