胞外酶

The 20S catalytic core of the 26S proteasome has the shape of a barrel made of four rings which are composed of seven differentαsubunitsα_1-α_7 at two outer rings and seven differentβsubunitsβ_1-β_7 at two inner rings at which the catalytic sites locate. Three of theβsubunits contain proteolyses sites, which are sequestered in the hollow interior of the 20S particle. Substrates enter the 20S through a narrow channel formed by theβsubunits, whose N-termini, depending on their conformation, can either obstruct or allow substrate entry and thus function as a gate. This entry channel is narrow and only permits passage of unfolded, linearized polypeptides.

哺乳动物26S蛋白酶体是由一个20S催化颗粒(catalytic particle，CP)和两个19S调节颗粒(regulatory particle，RP)组成的ATP(adenosine-triphosphate，ATP)依赖性蛋白水解酶复合体。20S CP是26S蛋白酶体的催化核心，它是由4个圆环堆叠形成的桶状复合物，其中两侧外环每个环是由α_1-α_7亚基组成，两个内环每个环是由β_1-β_7亚基组成，4个环的中央形成一个狭窄的内腔。2个β内环形成了20S CP的催化中心空腔，其内壁为催化活性位点所在地；外侧α环中心的孔道是底物到达催化中心空腔的通道，一般被α亚基上的N末端所封闭，阻止胞内非目的靶蛋白进入20S CP内被降解破坏。

The ultrastructure resultshowed that in model group blood intima was adema,broadening, evendiscontinuous and incomplete under blood vessel bast. In the blood themonocyte and the lymphocyte infiltrated to intension board. Manymacrophages could befound and there were massive all levels of dissolve theenzyme body and swallow slightly soak in its cytoblastema,The endosarc netand the ribose body was increased and outside the amnion the pseudopodappeared. Endothelial cell morphogenesis changed. It is obvious thatmitochondria was dropsy, cytoblastema was non-uniformity.

超微结构结果显示模型组血管内皮下内膜水肿、增宽，甚至间断不完整；血中单核细胞及淋巴细胞向内弹力板浸润，可见较多巨噬细胞，其胞浆内含大量各级溶酶体及吞噬小泡，内质网及核糖体增多，胞膜外出现伪足；内皮细胞形态发生改变，可见线粒体水肿，胞浆不均匀；中药治疗后，上述病理损害明显减轻。

Mitochondria was relatively little in size. Round primary lysosome with high electron-densed granules and secondary lysosome with high or low electron-densed granules were seen frequently. DCs contained many rough endoplasmic reticulum, the Golgi apparatus and ribosomes. The vacuoles with flocculent electron-densed granules were rare. Some special granules in cytoplasm were seen, whose surface like earphone were covered with a membrane. High electron-densed contents in the granules were near one side and the other side was bright. The nucleus became markedly small in volume, nephroid or hoofed in shape. The nucleus had little euchromatin and lots of heterochromatin under nuclear membrane.

子宫内膜癌组织DC超微结构特征如下：细胞形态不规则，与正常子宫内膜组织DC相比，胞膜较光滑，胞膜表面树突状胞浆突起显著减少，部分突起呈粗短状；胞质中线粒体相对少，圆形而电子密度高的初级溶酶体和不规则形且电子密度高低不一的次级溶酶体多见；高尔基体、粗面内质网、核糖体丰富；含微量絮状电子致密物的胞饮小泡显著减少；胞质中可见形态特殊的颗粒，该颗粒外周膜包裹，略呈圆形，中间部位稍弯曲，如耳机状，颗粒中由高电子致密物居于一侧，而另一侧则呈透亮状；胞核显著减小，居于胞质一侧，常呈肾形或马蹄形，核内常染色质较少，异染色质多边集于核膜下。

The formation of silique dehsicence susceptibility was investigated in terms of water content, synthetic rate of ethylene, enzyme activity of exo polygalacturonase and end cellulase , cell alteration in dehiscence zone in silique and silique dehiscence susceptibility during silique development.

从油菜角果发育过程中角果含水量、乙烯合成速率、外切 PG 酶和内切纤维素酶活性，以及角果裂区切片观察等方面研究了角果开裂敏感性形成的原因⒚花后50d 的角果果柄端壳状果瓣和线状果瓣间的裂区薄壁细胞膨大，在高倍光学显微镜下可见胞间空隙开始形成⒚此前6d 内乙烯合成速率迅速上升并出现第二次合成高峰，与之同步发生外切 PG酶和内切纤维素酶活性急剧上升，而乙烯合成第二高峰出现于角果含水量低于80％以下⒚由此看来，角果失水引起乙烯合成第二高峰出现，从而导致水解酶活性上升，最终导致果瓣裂区薄壁细胞膨大，分离和胞间空隙形成及角果开裂敏感性产生

The characters of crude extracellular laccase from Lenzites tricolor were studied.

并通过正交实验研究了碳源、氮源、木素类似物以及初始pH值对该菌产胞外漆酶的影响。

The overall level of proteolytic activity observed was higher in continuous culture than in batch.

后者的结果将表明，它是营养限制，而不是减少的增长速度是影响胞外蛋白水解酶的生产。

This latter result would suggest that it is nutrient limitation, rather than decreasing growth rate that influences the production of extracellular proteolytic enzymes.

后者的结果将表明，它是营养限制，而不是减少的增长速度是影响胞外蛋白水解酶的生产。

Methods: MUC1/Y extracellular domain was used as a target molecule to biopan Ph. D. 12 phage randem peptide library. Two protocols using affinity gel and cell culture plates respectively were carried out. Positive phage clones were identified by ELISA. ssDNA sequencing was done on 16 positive phage clones to get the amino acid sequences of MUC1/Y-binding peptides. Immunohistochemistry was done to show the capacity and specificity of positive phage clones to bind the tumor cell lines.

以MUC1/Y黏蛋白的胞外段蛋白(MUC1/Yex)为靶分子，用凝胶亲和法和酶联板法分别筛选十二肽噬菌体随机肽库，ELISA鉴定阳性克隆，DNA序列测定后确定MUC1/Yex结合肽的氨基酸序列；免疫组化鉴定阳性噬菌体克隆与正常及肿瘤细胞的结合能力及特异性。

It was found that production of the total extracellular protease and Pr1 was distinctly different among the inocula and varied between the inducers.

结果表明，球孢白僵菌不同接种物产生的总胞外蛋白酶及Pr1活性有明显差异；不同诱导物对产酶水平也有较大影响。

All C.neoformans contain serine protease; Serine proteinase perturbs the integrity of BMEC of the blood-brain barrier, improves open the level of BBB; Secreted serine protease from pathogenic fungi were virulence.

发现新生隐球菌分泌具有活性的胞外蛋白水解酶并含有丝氨酸蛋白酶成分；新生隐球菌自身分泌的丝氨酸蛋白酶可以干扰构成血脑屏障主要成分内皮细胞的完整性使得血脑屏障开放程度提高；致病性真菌分泌的丝氨酸蛋白酶可能是一种毒性因子。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。