Cell:硒蛋白助力特定神经元存活

2017-12-31 海北 MedSci原创

硒蛋白指的是生命体内含有第21个氨基酸,硒代半胱氨酸,的罕见蛋白质。硒代半胱氨酸类似于半胱氨酸,不同之处仅在于硒取代了硫原子。

硒蛋白指的是生命体内含有第21个氨基酸,硒代半胱氨酸,的罕见蛋白质。硒代半胱氨酸类似于半胱氨酸,不同之处仅在于硒取代了硫原子。然而至今为止,硒酸盐相对于硫醇盐基催化剂的实际优势仍然是不清楚的,因为大多数已知的硒蛋白也以含半胱氨酸的同系物形式存在。

近日,来自德国发育遗传学研究所的研究人员发现,让人出乎意料的是,哺乳动物必须的硒蛋白GPX4基于硒原子为基础的催化不是正常胚胎发育所必要的。然而,特定类型的中间神经元的存活完全取决于含硒代半胱氨酸的GPX4,其能够防止致命的癫痫发作。

从机理上说,硒代半胱氨酸能够赋予GPX4对不可逆的过度氧化作用的优异的抗性,而表达半胱氨酸变体的细胞对过氧化物诱导的铁死亡高度敏感。值得注意的是,在Gpx4cys / cys细胞中,所有硒蛋白的伴随缺失揭示了硒蛋白对于细胞活力是不必要的,只要部分GPX4活性得到保留即可。

因此,该发现证明了硒蛋白对生命体不可或缺的作用。


原始出处:

Irina Ingold et al. Selenium Utilization by GPX4 Is Required to Prevent Hydroperoxide-Induced FerroptosisCell, 2017; DOI: 10.1016/j.cell.2017.11.048


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  2. [GetPortalCommentsPageByObjectIdResponse(id=1870360, encodeId=1aa218e036054, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Tue Nov 20 20:51:00 CST 2018, time=2018-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960626, encodeId=790e1960626e9, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=36, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Wed May 02 06:51:00 CST 2018, time=2018-05-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=275361, encodeId=8d492e53612d, content=学习了.涨知识了!, beContent=null, objectType=article, channel=null, level=null, likeNumber=59, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mONcle9pic3zMoyicyo6ia9f4IuLQAwZoxD6Hx4ibd5CMcOCYhStY6oDibbKK6O2X8iaicldO5ib8j1iapOIobIKCGiczU2A/0, createdBy=56251941490, createdName=虈亣靌, createdTime=Thu Jan 04 12:34:10 CST 2018, time=2018-01-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=274847, encodeId=b28b2e484723, content=优质资源.共同学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=66, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mONcle9pic3zMoyicyo6ia9f4IuLQAwZoxD6Hx4ibd5CMcOCYhStY6oDibbKK6O2X8iaicldO5ib8j1iapOIobIKCGiczU2A/0, createdBy=56251941490, createdName=虈亣靌, createdTime=Tue Jan 02 22:58:11 CST 2018, time=2018-01-02, status=1, ipAttribution=)]
    2018-05-02 维他命
  3. [GetPortalCommentsPageByObjectIdResponse(id=1870360, encodeId=1aa218e036054, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Tue Nov 20 20:51:00 CST 2018, time=2018-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960626, encodeId=790e1960626e9, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=36, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Wed May 02 06:51:00 CST 2018, time=2018-05-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=275361, encodeId=8d492e53612d, content=学习了.涨知识了!, beContent=null, objectType=article, channel=null, level=null, likeNumber=59, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mONcle9pic3zMoyicyo6ia9f4IuLQAwZoxD6Hx4ibd5CMcOCYhStY6oDibbKK6O2X8iaicldO5ib8j1iapOIobIKCGiczU2A/0, createdBy=56251941490, createdName=虈亣靌, createdTime=Thu Jan 04 12:34:10 CST 2018, time=2018-01-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=274847, encodeId=b28b2e484723, content=优质资源.共同学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=66, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mONcle9pic3zMoyicyo6ia9f4IuLQAwZoxD6Hx4ibd5CMcOCYhStY6oDibbKK6O2X8iaicldO5ib8j1iapOIobIKCGiczU2A/0, createdBy=56251941490, createdName=虈亣靌, createdTime=Tue Jan 02 22:58:11 CST 2018, time=2018-01-02, status=1, ipAttribution=)]
    2018-01-04 虈亣靌

    学习了.涨知识了!

    0

  4. [GetPortalCommentsPageByObjectIdResponse(id=1870360, encodeId=1aa218e036054, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Tue Nov 20 20:51:00 CST 2018, time=2018-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960626, encodeId=790e1960626e9, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=36, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Wed May 02 06:51:00 CST 2018, time=2018-05-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=275361, encodeId=8d492e53612d, content=学习了.涨知识了!, beContent=null, objectType=article, channel=null, level=null, likeNumber=59, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mONcle9pic3zMoyicyo6ia9f4IuLQAwZoxD6Hx4ibd5CMcOCYhStY6oDibbKK6O2X8iaicldO5ib8j1iapOIobIKCGiczU2A/0, createdBy=56251941490, createdName=虈亣靌, createdTime=Thu Jan 04 12:34:10 CST 2018, time=2018-01-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=274847, encodeId=b28b2e484723, content=优质资源.共同学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=66, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mONcle9pic3zMoyicyo6ia9f4IuLQAwZoxD6Hx4ibd5CMcOCYhStY6oDibbKK6O2X8iaicldO5ib8j1iapOIobIKCGiczU2A/0, createdBy=56251941490, createdName=虈亣靌, createdTime=Tue Jan 02 22:58:11 CST 2018, time=2018-01-02, status=1, ipAttribution=)]
    2018-01-02 虈亣靌

    优质资源.共同学习

    0