期刊
JOURNAL OF EXPERIMENTAL MEDICINE
卷 211, 期 12, 页码 2439-2454出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20141123
关键词
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资金
- Chinese Academy of Sciences [XDA01010407, XDA01020203]
- National Natural Science Foundation of China [81330047, 30830030, 31372404]
- National Key Basic Research Program of China [2010CB911902, 2014CB964601]
- Chinese Academy of Sciences
- China Postdoctoral Science Foundation [20110490617, 2012T50145]
Bone marrow progenitor cells develop into mature megakaryocytes (MKs) to produce platelets for hemostasis and other physiological functions. However, the molecular mechanisms underlying megakaryopoiesis are not completely defined. We show that cytosolic carboxy-peptidase (CCP) 6 deficiency in mice causes enlarged spleens and increased platelet counts with underdeveloped MKs and dysfunctional platelets. The prominent phenotypes of CCP6 deficiency are different from those of CCP1-deficient mice. We found that CCP6 and tubulin tyrosine ligase-like family (TTLL) members TTLL4 and TTLL6 are highly expressed in MKs. We identify Mad2 (mitotic arrest deficient 2) as a novel substrate for CCP6 and not CCP1. Mad2 can be polyglutamylated by TTLL4 and TTLL6 to modulate the maturation of MKs. CCP6 deficiency causes hyperglutamylation of Mad2 to promote activation of Aurora B, leading to suppression of MK maturation. We reveal that Mad2 polyglutamylation plays a critical role in the regulation of megakaryopoiesis.
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