组织蛋白酶E

组织蛋白酶E（英文：Cathepsin E）是一种酶（EC 3.4.23.34），在人体中由CTSE基因编码。^[5][6][7]该酶又称慢速蛋白酶、红细胞膜天冬氨酸蛋白酶、SMP、EMAP、非胃蛋白酶、组织蛋白酶D样酸性蛋白酶、组织蛋白酶E样酸性蛋白酶、组织蛋白酶D型蛋白酶。^{[8][9][10][11]}

组织蛋白酶E
已知的结构 PDB 直系同源搜索: PDBe RCSB PDBID列表 1TZS
识别号
别名	CTSE；, Ctse, A430072O03Rik, C920004C08Rik, CE, CatE, cathepsin E
外部ID	OMIM：116890 MGI：107361 HomoloGene：37551 GeneCards：CTSE
基因位置（人类） 染色体 1号染色体[1] 基因座 1q32.1 起始 206,008,535 bp[1] 终止 206,023,909 bp[1]
基因位置（小鼠） 染色体 小鼠1号染色体[2] 基因座 1 E4|1 57.14 cM 起始 131,566,044 bp[2] 终止 131,603,243 bp[2]
RNA表达模式
查阅更多表达数据
基因本体 分子功能 • 肽酶活性 • 水解酶活性 • protein homodimerization activity • aspartic-type endopeptidase activity 细胞组分 • 核内体 生物学过程 • protein autoprocessing • protein catabolic process • antigen processing and presentation of exogenous peptide antigen via MHC class II • 蛋白酶解 Sources:Amigo / QuickGO
直系同源
物种	人类	小鼠
Entrez	1510	13034
Ensembl	ENSG00000196188	ENSMUSG00000004552
UniProt	P14091	P70269
mRNA​序列	NM_001910 ​NM_148964 ​NM_001317331	NM_007799
蛋白序列	NP_001304260 ​NP_001901 ​NP_683865	NP_031825
基因位置​（UCSC）	Chr 1: 206.01 – 206.02 Mb	Chr 1: 131.57 – 131.6 Mb
PubMed​查找	[3]	[4]
维基数据
查看/编辑人类 查看/编辑小鼠

Cathepsin E
命名 系统命名 缩写
识别码
EC编号	3.4.23.34
CAS号	110910-42-4
数据库
IntEnz	IntEnz浏览
BRENDA（英语：BRENDA）	BRENDA入口
ExPASy（英语：ExPASy）	NiceZyme浏览
KEGG	KEGG入口
MetaCyc（英语：MetaCyc）	代谢路径
PRIAM（英语：PRIAM_enzyme-specific_profiles）	概述
PDB	RCSB PDB PDBj PDBe PDBsum
搜索 PMC 相关文献 PubMed 相关文献

组织蛋白酶E是一种在动物以及各种其他生物中发现的蛋白酶，属于天冬氨酸蛋白酶组。在人类中，它由位于1号染色体1q32。^{[12][13][11][14]}它是一种细胞内非溶酶体糖蛋白，主要存在于皮肤和免疫细胞中。^[15]该蛋白质是作为二硫键连接的同源二聚体发挥作用的天冬氨酰蛋白酶，具有高甘露糖型的寡糖链。^[16]它是肽酶A1家族的成员，因此它与胃蛋白酶A和组织蛋白酶D有相似的特异性。组织蛋白酶E是一种细胞内酶，并且不参与膳食蛋白质的消化。它在胃的上皮粘液产生细胞表面的丰度最高。它是第一种存在于胎儿胃中的天冬氨酸蛋白酶，存在于超过一半的胃癌中，因此它似乎是一种肿瘤胚胎抗原。该基因存在利用替代多腺苷酸化信号的转录变体和编码不同异构体的两种转录变体。^[14][15]

体内缺乏组织蛋白酶E可能导致炎症性皮肤病（如异位性皮炎），对此的治疗将依赖于固定体内蛋白质的功能和水平。^[17]与肾素和组织蛋白酶D一样，组织蛋白酶E是少数已知的在消化道和生殖道以外的人体组织中产生的天冬氨酸蛋白酶之一。^[18]

结构

组织蛋白酶E的结构与组织蛋白酶D和Β分泌酶1的结构非常相似，并且它们都具有几乎相同的活性位点区域。它们之间的区别在于它们活性位点周围的微环境。残基DTG 96-98和DTG 281-283有助于酶活性位点的形成。在残基Cys 272-276和Cys 314-351处也有两对二硫键。氨基酸链上第109位和第114位的另外两个Cys残基在三维空间中彼此靠近，但是它们的硫原子之间的距离为3.53Å，这对于形成适当的二硫键来说太大了。该结构在活性位点的 Asp残基和周围的残基之间也有四个氢键。与组织蛋白酶D和Β分泌酶1的结构相比，组织蛋白酶E的一个区别因素可以看出，在Asp 96和Ser 99残基之间形成了额外的氢键，并且在Asp 281处没有与Leu/Met形成氢键。^[17]

在生物体内的分布

组织蛋白酶E分布在消化道、淋巴组织、血细胞、泌尿器官和小胶质细胞中。它在不同哺乳动物细胞中的细胞内定位与其类似的组织蛋白酶D不同。组织蛋白酶E与胃壁细胞的胞内小管、肝细胞的胆小管、肾脏的近端肾小管细胞、肠、气管和支气管的上皮细胞、破骨细胞甚至红细胞中的膜组织结合。它在内体结构中的定位可见于许多不同的细胞类型，例如抗原呈递B细胞淋巴母细胞、胃细胞和小胶质细胞。在细胞内质网的扁囊中也检测到它的存在。^[16][19]

功能

组织蛋白酶E在蛋白质降解、通过MHCII类分子途径加工的抗原^[14]和生物活性蛋白的产生中起着至关重要的作用。该酶还被认为与年龄诱导的神经元死亡途径的执行以及兴奋毒素对谷氨酸受体的过度刺激和短暂的前脑缺血有关。在对老鼠进行的一项实验中，在年轻老鼠的脑组织中几乎没有检测到组织蛋白酶E，但在老年大鼠的新纹状体和大脑皮质中其水平大大增加。在短暂的前脑缺血一周后，该酶还在海马体CA1区的活化小胶质细胞和退化的神经元中高水平表达。^[19]组织蛋白酶E可能在肠化生分化良好的腺癌的发展中发挥作用。^[16]该酶还与树突状细胞有关，在树突状细胞中它产生CD4库以响应自身和外来蛋白质。^[20]

后翻译修饰

该酶被糖基化。不同的细胞类型导致碳水化合物链的性质不同。在成纤维细胞中的酶原中观察到高甘露糖型寡糖，然而在复合型寡糖中可以看到成熟酶。在红细胞膜中，成熟酶和酶原均具有复合型寡糖。自催化裂解产生两种形式的酶，形式1从残基Ile 54开始，形式2在Thr 57开始。^[21]

参见

• 组织蛋白酶

参考文献

1. GRCh38: Ensembl release 89: ENSG00000196188 - Ensembl, May 2017
2. GRCm38: Ensembl release 89: ENSMUSG00000004552 - Ensembl, May 2017
3. Human PubMed Reference:. National Center for Biotechnology Information, U.S. National Library of Medicine.
4. Mouse PubMed Reference:. National Center for Biotechnology Information, U.S. National Library of Medicine.
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7. Entrez Gene: CTSE cathepsin E. [2022-10-17]. （原始内容存档于2010-12-05）.
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13. Couvreur JM, Azuma T, Miller DA, Rocchi M, Mohandas TK, Boudi FA, Taggart RT. Assignment of cathepsin E (CTSE) to human chromosome region 1q31 by in situ hybridization and analysis of somatic cell hybrids. Cytogenetics and Cell Genetics. 1990, 53 (2–3): 137–9. PMID 2369841. doi:10.1159/000132914.
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17. Chou KC. Modeling the tertiary structure of human cathepsin-E. Biochemical and Biophysical Research Communications. May 2005, 331 (1): 56–60. PMID 15845357. doi:10.1016/j.bbrc.2005.03.123.
18. Lees WE, Kalinka S, Meech J, Capper SJ, Cook ND, Kay J. Generation of human endothelin by cathepsin E. FEBS Letters. October 1990, 273 (1–2): 99–102. PMID 2226872. doi:10.1016/0014-5793(90)81060-2 .
19. Tsukuba T, Okamoto K, Yasuda Y, Morikawa W, Nakanishi H, Yamamoto K. New functional aspects of cathepsin D and cathepsin E. Molecules and Cells. December 2000, 10 (6): 601–11. PMID 11211863. S2CID 20761872. doi:10.1007/s10059-000-0601-8.
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21. CTSE - Cathepsin E precursor - Homo sapiens (Human) - CTSE gene & protein. www.uniprot.org. [2016-10-16]. （原始内容存档于2020-11-09）.

拓展阅读

• Tsukuba T, Yamamoto K. [Atopic dermatitis and cathepsin E]. Nihon Yakurigaku Zasshi. Folia Pharmacologica Japonica. July 2003, 122 (1): 15–20. PMID 12843568. doi:10.1254/fpj.122.15 .
• Flynn TJ, Deshmukh DS, Pieringer RA. Effects of altered thyroid function on galactosyl diacylglycerol metabolism in myelinating rat brain. The Journal of Biological Chemistry. August 1977, 252 (16): 5864–70. PMID 195962. doi:10.1016/S0021-9258(17)40103-7 .
• Azuma T, Liu WG, Vander Laan DJ, Bowcock AM, Taggart RT. Human gastric cathepsin E gene. Multiple transcripts result from alternative polyadenylation of the primary transcripts of a single gene locus at 1q31-q32. The Journal of Biological Chemistry. January 1992, 267 (3): 1609–14. PMID 1370478. doi:10.1016/S0021-9258(18)45989-3 .
• Saku T, Sakai H, Shibata Y, Kato Y, Yamamoto K. An immunocytochemical study on distinct intracellular localization of cathepsin E and cathepsin D in human gastric cells and various rat cells. Journal of Biochemistry. December 1991, 110 (6): 956–64. PMID 1794985. doi:10.1093/oxfordjournals.jbchem.a123696.
• Athauda SB, Takahashi T, Inoue H, Ichinose M, Takahashi K. Proteolytic activity and cleavage specificity of cathepsin E at the physiological pH as examined towards the B chain of oxidized insulin. FEBS Letters. November 1991, 292 (1–2): 53–6. PMID 1959628. doi:10.1016/0014-5793(91)80832-N .
• Lees WE, Kalinka S, Meech J, Capper SJ, Cook ND, Kay J. Generation of human endothelin by cathepsin E. FEBS Letters. October 1990, 273 (1–2): 99–102. PMID 2226872. doi:10.1016/0014-5793(90)81060-2 .
• Athauda SB, Matsuzaki O, Kageyama T, Takahashi K. Structural evidence for two isozymic forms and the carbohydrate attachment site of human gastric cathepsin E. Biochemical and Biophysical Research Communications. April 1990, 168 (2): 878–85. PMID 2334440. doi:10.1016/0006-291X(90)92403-M.
• Fowler SD, Kay J, Dunn BM, Tatnell PJ. Monomeric human cathepsin E. FEBS Letters. June 1995, 366 (1): 72–4. PMID 7789521. S2CID 38970367. doi:10.1016/0014-5793(95)00501-Y.
• Finley EM, Kornfeld S. Subcellular localization and targeting of cathepsin E. The Journal of Biological Chemistry. December 1994, 269 (49): 31259–66. PMID 7983070. doi:10.1016/S0021-9258(18)47417-0 .
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外部链接

• The MEROPS online database for peptidases and their inhibitors: A01.010 （页面存档备份，存于互联网档案馆）
• 医学主题词表（MeSH）：Cathepsin+E