Nature:点赞!同日上线4篇Nature,华人学者们真给力!

2017-09-07 佚名 学术经纬

今日,权威学术期刊《自然》杂志在线刊登了4篇来自华人学者的文章。它们有的找到了预防黑色素瘤的新策略,有的发现了常见mRNA修饰在动物发育中的关键作用,有的则通过解析蛋白结构,解决了迟迟未得到阐明的生物难题。华人学者近年来在生命科学领域不断做出卓越的突破。今日《自然》在线刊登的4项研究,则是对科学家们辛勤科研的最好回报!

今日,权威学术期刊《自然》杂志在线刊登了4篇来自华人学者的文章。它们有的找到了预防黑色素瘤的新策略,有的发现了常见mRNA修饰在动物发育中的关键作用,有的则通过解析蛋白结构,解决了迟迟未得到阐明的生物难题。华人学者近年来在生命科学领域不断做出卓越的突破。今日《自然》在线刊登的4项研究,则是对科学家们辛勤科研的最好回报!

1.崔儒涛博士课题组



Palmitoylation-dependent activation of MC1R prevents melanomagenesis

黑皮素1受体(MC1R)是一种G蛋白偶联受体,它在人类和大鼠的色素沉淀中扮演了重要的作用。MC1R在激活后,能进一步促进cAMP通路和黑色素的产生,帮助在紫外线的辐射后修复DNA。另一些研究则表明,一种名为“RHC变异”的特殊MC1R和黑色素瘤风险有关。尽管这种蛋白在人体内起到了重要作用,但我们还不知道,紫外线辐射如何调节了MC1R的活性,也不知道为何RHC变异让黑色素瘤更容易发作。在这项研究中,波士顿大学医学院的崔儒涛博士团队表明,MC1R的棕榈酰化修饰(palmitoylation)对MC1R信号通路的激活有着重要作用,并能在体外与体内控制黑色素的生成。在小鼠模型中,研究人员们发现,在使用一种小分子药物抑制“去棕榈酰化”后,RHC变异的棕榈酰化得到了促进,其缺陷得到了弥补,显着降低了小鼠的黑色素瘤发病几率。这为黑色素瘤的防治提供了重要的新思路。


▲MC1R的棕榈酰化有助于预防黑色素瘤(图片来源:《自然》)

2.刘峰博士/杨运桂博士课题组

m6A modulates haematopoietic stem and progenitor cell specification


▲刘峰博士


▲杨运桂博士

N6-甲基腺嘌呤(m6A)是真核生物mRNA最常见的修饰,然而它们在脊椎动物胚胎发育过程中的作用依然不甚明朗。在这项研究中,中科院动物研究所的刘峰博士研究团队与中科院北京基因组研究所的杨运桂博士项目组通力合作,显示m6A能在斑马鱼的胚胎发育过程中,影响造血干细胞/祖细胞的命运。在缺乏甲基转移酶mettl3的胚胎中,m6A水平有着显着下降,造血祖细胞的出现也受到了抑制。在小鼠中抑制Mettl3的表达,产生了类似的效果。综合来看,这项研究表明m6A修饰在脊椎动物胚胎发育过程中,对于造血祖细胞命运的决定起了关键性作用。


▲m6A修饰调控造血干细胞产生模式图(图片来源:中科院动物研究所)

3.廖茂富博士课题组



Structural basis of MsbA-mediated lipopolysaccharide transport

脂多糖(lipopolysaccharide)是许多革兰氏阴性菌外膜上的一种分子,它对于细胞被膜(cell envelope)的组装有着重要的作用。在这些细菌里,脂多糖的合成位点在内膜的细胞质侧,但它们会被MsbA蛋白“翻个面”,来到内膜的周质侧。哈佛医学院的廖茂富博士团队利用冷冻电镜的方法,解析了MsbA蛋白在三个功能性状态下的结构。这些结构清楚地解释了脂多糖如何结合MsbA,并描绘了MsbA如何翻转脂多糖的过程。这有望让我们更好地了解这类蛋白质。



4.王占新博士课题组



Polycomb-like proteins link the PRC2 complex to CpG islands

在生物体中,PRC2复合体调控转录抑制,在许多生物学进程中扮演了关键作用。与PRC2相关的一些PCL蛋白(如PHF1,MTF2,PHF19)能形成亚复合体,与PRC2的核心成分结合。人们相信这表明PCL蛋白能够调节PRC2的酶活性,帮助它特异性地结合到基因组中富含CG的区域。然而,这个机制一直没有得到彻底证实。在这项研究中,北京师范大学的王占新博士课题组一举解决了这个难题。研究人员们解析了PHF1和MTF2在结合DNA(含有CpG区)时的N端结构域,并表明这些PCL1的确对PRC2复合体对于CpG岛的结合起到了关键的作用。这是人类获得的首个直接证据。



我们再次向这些课题组表示祝贺,并祝愿更多华人学者的杰出成果能不断登上一流的国际学术舞台!

原始出处:

[1]Shuyang Chen, Bo Zhu, Chengqian Yin, et al. Palmitoylation-dependent activation of MC1R prevents melanomagenesis. Nature (2017)

[2]Chunxia Zhang, Yusheng Chen, Baofa Sun, et al. m6A modulates haematopoietic stem and progenitor cell specification. Nature (2017) 

[3]Wei Mi, Yanyan Li, Sung Hwan Yoon, et al. Structural basis of MsbA-mediated lipopolysaccharide transport. Nature (2017)


[4]Haojie Li, Robert Liefke, Junyi Jiang, et al. Polycomb-like proteins link the PRC2 complex to CpG islands. Nature (2017) 

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    2017-11-22 liye789132251
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    2017-09-09 yayale

    期待本土的科研团队也能做出来这样的研究

    0

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    2017-09-09 戒馋,懒,贪

    有点意思.谢谢分享

    0

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    2017-09-08 1ddf0692m34(暂无匿称)

    学习了.好榜样

    0

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