A licensing step links AID to transcription elongation for mutagenesis in B cells.

A licensing step links AID to transcription elongation for mutagenesis in B cells.
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DOI:
10.1038/s41467-018-03387-6
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发表时间:
2018-03-28
影响因子:
16.6
通讯作者:
Di Noia JM
Di Noia JM
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Methot SP;Litzler LC;Subramani PG;Eranki AK;Fifield H;Patenaude AM;Gilmore JC;Santiago GE;Bagci H;Côté JF;Larijani M;Verdun RE;Di Noia JM

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活化诱导的脱氨酶(AID)使免疫球蛋白(IG)基因突变以启动B细胞中的体细胞超突变(SHM)和类别转换重组(CSR),从而支持抗体应答。艾滋病会使几百个其他基因座发生突变,但大多数艾滋病占据的基因都不会发生突变。生产性脱氨作用与非生产性援助目标的潜在机制尚不清楚。在这里,我们表明,三个聚集的精氨酸残基定义了一个功能性AID结构域所需的SHM,CSR,并在B细胞中的脱靶活性,而不影响AID脱氨酶活性或大肠杆菌诱变。野生型AID和在该结构域中具有单个氨基酸置换的突变体两者广泛地与Spt 5和染色质缔合,并占据AID靶基因的启动子。然而,突变的AID不能占据相应的基因体,并失去与转录延伸因子的关联。因此,AID的诱变活性不是由基因座占有率决定的,而是由一种许可机制决定的,这种机制将AID与转录延伸结合起来。激活诱导的脱氨酶(AID)对于诱导B细胞受体基因的期望突变以实现有效的抗体反应非常重要。在这里,作者表明AID的三个关键精氨酸残基将AID-染色质结合与转录延伸连接起来,以允许AID在B细胞中进行特异性诱变。
Activation-induced deaminase (AID) mutates the immunoglobulin (Ig) genes to initiate somatic hypermutation (SHM) and class switch recombination (CSR) in B cells, thus underpinning antibody responses. AID mutates a few hundred other loci, but most AID-occupied genes are spared. The mechanisms underlying productive deamination versus non-productive AID targeting are unclear. Here we show that three clustered arginine residues define a functional AID domain required for SHM, CSR, and off-target activity in B cells without affecting AID deaminase activity or Escherichia coli mutagenesis. Both wt AID and mutants with single amino acid replacements in this domain broadly associate with Spt5 and chromatin and occupy the promoter of AID target genes. However, mutant AID fails to occupy the corresponding gene bodies and loses association with transcription elongation factors. Thus AID mutagenic activity is determined not by locus occupancy but by a licensing mechanism, which couples AID to transcription elongation. Activation-induced deaminase (AID) is important for inducing desirable mutations at the B cell receptor genes for effective antibody responses. Here the authors show that three key arginine residues of AID link AID-chromatin association with transcription elongation to license AID for specific mutagenesis in B cells.
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