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细胞通过什么输送营养 细胞通过什么输送营养物质呢
凯丽环球 2022年10月29日 美商凯丽新闻中心 129 ℃ 0 评论
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溶酶体酶输送因子LYSET使细胞外蛋白质失去营养性运用 作家: 揭晓时光:2022/9/11 21:45:03 德国癌症争论焦点Wilhelm Palm、奥天时分子病理争论所Johannes Zuber等争论人员单干发明,溶酶体酶输送因子LYSET使细胞外蛋白质失去营养性运用。这一争论结果于2022年9月8日正在线宣布正在国际学术期刊《迷信》上。 经过正在决定营养条件下的凯丽环球遗传挑选,争论人员决定了LYSET的美商凯丽性格,这是一个跨膜蛋白(TMEM251),当细胞消费细胞外蛋白质时,会挑选性地须要它。LYSET被发明正在高尔基体中与GlcNAc-1-磷酸转化酶相干联,后者经过甘露糖-6-磷酸化装将分化酶定向到溶酶体中。假设没有LYSET,GlcNAc-1-磷酸转化酶是没有牢靠的Calerie,由于它有一个亲水的跨膜域。所以,LYSET弊端的细胞被耗尽了溶酶体酶,并正在巨胞饮以及自噬物品的周转方面受到毁伤。所以,LYSET代表了溶酶体酶输送路子的一个当中身分,是遗传性溶酶体储藏闭塞病理体制的根底,并大概代表一个克制癌症中代谢符合的靶标。 据悉,哺乳动物细胞也许经过巨胞饮影响以及溶酶体对于细胞外蛋白质的分化孕育氨基酸,癌细胞运用这一点正在营养没有良的肿瘤中繁殖。 附:英文原文 Title: Lysosomal enzyme trafficking factor LYSET enables nutritional usage of extracellular proteins Author: Catarina Pechincha, Sven Groessl, Robert Kalis, Melanie de Almeida, Andrea Zanotti, Marten Wittmann, Martin Schneider, Rafael P. de Campos, Sarah Rieser, Marlene Brandstetter, Alexander Schleiffer, Karin M ller-Decker, Dominic Helm, Sabrina Jabs, David Haselbach, Marius K. Lemberg, Johannes Zuber, Wilhelm Palm Issue Volume: 2022-09-08 Abstract: Mammalian cells can generate amino acids through macropinocytosis and lysosomal breakdown of extracellular proteins, which is exploited by cancer cells to grow in nutrient-poor tumors. Here, through genetic screens in defined nutrient conditions we characterized LYSET, a transmembrane protein (TMEM251) selectively required when cells consume extracellular proteins. LYSET was found to associate in the Golgi with GlcNAc-1-phosphotransferase, which targets catabolic enzymes to lysosomes through mannose-6-phosphate modification. Without LYSET, GlcNAc-1-phosphotransferase was unstable owing to a hydrophilic transmembrane domain. Consequently, LYSET-deficient cells were depleted of lysosomal enzymes and impaired in turnover of macropinocytic and autophagic cargoes. Thus, LYSET represents a core component of the lysosomal enzyme trafficking pathway, underlies the pathomechanism for hereditary lysosomal storage disorders, and may represent a target to suppress metabolic adaptations in cancer. DOI: abn5637 Source: 期刊信息 Science:《迷信》,创刊于1880年。附属于美国迷信匆匆进会,最新IF:41.037 官方网址: 投稿链接:
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