GmcA is a putative glucose-methanol-choline oxidoreductase required for the induction of asexual development in Aspergillus nidulans.

GmcA is a putative glucose-methanol-choline oxidoreductase required for the induction of asexual development in Aspergillus nidulans.
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DOI:
10.1371/journal.pone.0040292
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Espeso EA
Espeso EA
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Etxebeste O;Herrero-García E;Cortese MS;Garzia A;Oiartzabal-Arano E;de los Ríos V;Ugalde U;Espeso EA

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构巢曲霉无性分化由上游发育激活剂 (UDA) 诱导,其中包括 bZIP 型转录因子 (TF) FlbB。对存在和不存在 FlbB 时差异表达的蛋白质进行 2D-PAGE/MS-MS 耦合筛选,鉴定出 18 个候选蛋白。大多数考生属于涉及渗透和/或氧化应激反应的 GO 术语类别。其中,我们重点关注 GmcA,一种假定的葡萄糖-甲醇-胆碱氧化还原酶,它在 ΔflbB 背景下上调。 GmcA 不是生长所必需的,因为删除 gmcA 后径向延伸没有检测到差异。然而,在特定培养条件下诱导分生孢子需要其活性。 ΔgmcA 菌株在酸性条件下大量产生分生孢子,但在碱性介质中表现出特征性的蓬松分生孢子表型。一方面,使用高浓度的不可发酵碳源(如甘油),另一方面,当 cMyb 型 UDA TF flbD 过表达时,可以抑制 ΔgmcA 菌株中无性发育的缺乏。总体而言,这项工作中获得的结果支持 GmcA 在分生孢子梗起始早期阶段的作用。
Aspergillus nidulans asexual differentiation is induced by Upstream Developmental Activators (UDAs) that include the bZIP-type Transcription Factor (TF) FlbB. A 2D-PAGE/MS-MS-coupled screen for proteins differentially expressed in the presence and absence of FlbB identified 18 candidates. Most candidates belong to GO term classes involved in osmotic and/or oxidative stress response. Among these, we focused on GmcA, a putative glucose-methanol-choline oxidoreductase which is upregulated in a ΔflbB background. GmcA is not required for growth since no differences were detected in the radial extension upon deletion of gmcA. However, its activity is required to induce conidiation under specific culture conditions. A ΔgmcA strain conidiates profusely under acid conditions but displays a characteristic fluffy aconidial phenotype in alkaline medium. The absence of asexual development in a ΔgmcA strain can be suppressed, on one hand, using high concentrations of non-fermentable carbon sources like glycerol, and on the other hand, when the cMyb-type UDA TF flbD is overexpressed. Overall, the results obtained in this work support a role for GmcA at early stages of conidiophore initiation.
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