·常規(guī)信息  最近更新:2021年2月13日 21:42:00
                基因(座)名稱白葉枯病抗性基因; 細(xì)菌性條斑病抗性基因; 轉(zhuǎn)錄因子ⅡAγ亞基
                Bacterial Blight resistance 5; Resistance to Bacterial Leaf Streak; transcription factor IIA gamma subunit 5
                基因符號(hào)xa5; OsTFIIAγ5; qBlsr5a
                所在染色體5 (已克。

                qBlsr5a(LOC_Os05g01710, Xie et al. 2014), xa5(AY643717/AF532975, Iyer et al. 2004), TFIIAγ5(Jiang et al. 2006), 位于同一基因位點(diǎn)...

                xa5是抗白葉枯病隱性基因,同時(shí)對(duì)細(xì)菌性條斑病可能也具有抗性。

                【定位與克隆】

                xa5位于5號(hào)染色體,cDNA全長(zhǎng)906bp,包含有3個(gè)外顯子,編碼一個(gè)由106氨基酸組成的蛋白產(chǎn)物,該蛋白產(chǎn)物是一個(gè)轉(zhuǎn)錄因子ⅡA的γ亞基(TFⅡAγ)。與先前發(fā)現(xiàn)的抗病基因不同,TFⅡAγ是真核生物的轉(zhuǎn)錄因子,但其在抗病基因中的作用以前未知。xa5在抗病品種IRBB5和感病品種日本晴及IR24中有兩個(gè)堿基的差異,導(dǎo)致IRBB5中的第39位的纈氨酸在日本晴及IR24中變成谷氨酸。xa5的3'-UTR在IRBB5和IR24之間發(fā)生5bp的置換,但發(fā)生置換的這5bp在IRBB5和日本晴中是一樣的,說明這個(gè)差異并不引起抗病性的差異。

                xa5是一個(gè)隱性抗病基因,其基因結(jié)構(gòu)與其他典型的抗病基因的結(jié)構(gòu)都不一樣。xa5的序列在抗病和感病品種中有兩個(gè)堿基的差異導(dǎo)致一個(gè)氨基酸的改變(纈氨酸變成谷氨酸),該氨基酸位點(diǎn)位于蛋白三維結(jié)構(gòu)的表面,可能與蛋白的相互作用有關(guān)。該氨基酸位點(diǎn)的差異引起抗病性的差異在其他抗病和感病品種中也存在,說明xa5基因型與抗病表型的相關(guān)性是保守的。

                【生物學(xué)功能】

                白葉枯病菌在雜合和純合感病水稻上的生長(zhǎng)沒有顯著差別,一個(gè)Xa5 等位基因足以使抗病品種發(fā)病,增加一個(gè)拷貝并不能增加病斑的長(zhǎng)度。秈稻背景的抗病近等基因系比感病近等基因系的病原菌數(shù)目更多,但并沒表現(xiàn)出病斑,相反,粳稻背景的抗病和感病近等基因系的病原菌數(shù)目有很大差異,無論是秈稻和粳稻背景的抗病進(jìn)等基因系,病原菌的轉(zhuǎn)移都被延遲。這些結(jié)果表明xa5 介導(dǎo)的隱性抗病反應(yīng)抑制了病原菌的轉(zhuǎn)移而不是限制病原菌的增殖(Iyer-Pascuzzi et al., 2008)。

                水稻黃單胞菌兩個(gè)致病變種白葉枯病菌和條斑病菌的轉(zhuǎn)錄激活因子樣效應(yīng)物(TALEs),能直接與TFIIAγ5相互作用,激活宿主即水稻的易感基因,TFIIAγ5表達(dá)下調(diào)或或突變使得轉(zhuǎn)基因水稻具有抗病性(Yuan et al. 2016)。

                【相關(guān)登錄號(hào)】
                contigs及其產(chǎn)物:AP014961BAS91888
                基因及產(chǎn)物ID號(hào):KF689653AHC94886, KF689654AHC94887
                cDNAs及其產(chǎn)物:AK065182BAG89404, HQ324815AEP20535, AY643716AAV53715, AY643717AAV53716, AK060845, BT129756, BT130053
                參考基因組位點(diǎn):Os05g0107700(RAP-DB, PhytoAB公司抗體服務(wù)←→ LOC_Os05g01710(本地、MSU-RGAP, 百格基因突變體服務(wù)←→ LOC4337575(NCBI)
                參考基因組產(chǎn)物:XM_015785148XP_015640634, XM_015785149XP_015640635, XM_015785150XP_015640636
                uniprot庫(kù)登錄號(hào):Q0DLD3, B7EAK7
                將本文分享到:
                ·ONTOLOGY及相關(guān)基因
                表型特征白葉枯病抗性(TO:0000175), 水稻細(xì)菌性條斑病抗性(TO:0000203)
                分子功能DNA轉(zhuǎn)錄因子活性(GO:0003700)
                生物進(jìn)程RNA聚合酶II啟動(dòng)子驅(qū)動(dòng)的轉(zhuǎn)錄起始(GO:0006367), 基因表達(dá)調(diào)控(GO:0010468), 抗細(xì)菌反應(yīng)調(diào)控(GO:1900424)
                細(xì)胞結(jié)構(gòu)轉(zhuǎn)錄因子TFIIA復(fù)合物(GO:0005672)
                形態(tài)構(gòu)造維管葉(PO:0009025)
                ·參考文獻(xiàn)
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