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        橡膠樹水通道蛋白HbPIP1;4的亞細胞定位與多聚化分析

        2024-01-01 00:00:00鄒智鄭玉皎喬雪瑩
        熱帶作物學報 2024年6期
        關(guān)鍵詞:乳管橡膠樹同源

        摘""要:質(zhì)膜內(nèi)在蛋白(PIP)隸屬于水通道蛋白家族,其以細胞膜定位并具有高效的水分轉(zhuǎn)運活性而著稱。PIP高度保守,主要包含PIP1和PIP2兩個亞類。天然橡膠是重要的工業(yè)原料和戰(zhàn)略物資,其主要來源為巴西橡膠樹。作為橡膠合成和儲藏的特異組織,乳管與鄰近的薄壁細胞之間缺乏胞間連絲,其水分平衡主要由PIP介導。通過前期研究,團隊鑒定到一個PIP1亞類成員HbPIP1;4,該基因在乳管中高水平表達,然而,其在蟾蜍卵母細胞中異源表達卻無水分轉(zhuǎn)運活性,推測因不能有效定位到細胞膜所致。為探討HbPIP1;4在植物體內(nèi)的功能部位及作用模式,本研究構(gòu)建了其亞細胞定位和雙分子熒光互補(BiFC)載體。通過利用農(nóng)桿菌介導法瞬時轉(zhuǎn)化煙草葉片,再用激光共聚焦顯微鏡進行觀察,發(fā)現(xiàn)熒光信號出現(xiàn)在細胞膜,這與生物信息學預(yù)測的細胞膜定位結(jié)果一致。BiFC實驗進一步證實HbPIP1;4定位在細胞膜,結(jié)果同時顯示,HbPIP1;4可形成同源多聚體,這與3D結(jié)構(gòu)預(yù)測結(jié)果一致。上述結(jié)果為深入揭示乳管的水分平衡機制奠定了堅實的基礎(chǔ)。但HbPIP1;4的異源互作模式還有待進一步研究。

        關(guān)鍵詞:橡膠樹;乳管;水通道蛋白;質(zhì)膜內(nèi)在蛋白;亞細胞定位;雙分子熒光互補中圖分類號:S794.1""""""文獻標志碼:A

        Subcellular"Localization"and"Multimerization"Analyses"of"HbPIP1;4,"a"PIP"Aquaporin"from"Rubber"Tree"(Hevea"brasiliensis"Muell."Arg.)

        ZOU"Zhi,"ZHENG"Yujiao,"QIAO"Xueying

        National"Key"Laboratory"for"Tropical"Crop"Breeding"/"Institute"of"Tropical"Biosciences"and"Biotechnology,"Chinese"Academy"of"Tropical"Agricultural"Sciences"/"Sanya"Research"Institute,"Chinese"Academy"ofnbsp;Tropical"Agricultural"Sciences,"Haikou,"Hainan"571101,"China

        Abstract:"Plasma"membrane"intrinsic"proteins"(PIPs),"which"belong"to"the"aquaporin"(AQP)"family"within"the"major"intrinsic"protein"(MIP)"superfamily,"are"known"for"the"high"water"transport"activity"at"the"cell"membrane."The"subfamily"is"highly"conservative"and"only"includes"two"phylogenetic"groups"named"PIP1"and"PIP2."Natural"rubber,"an"important"industrial"raw"material"and"strategic"material,"is"mainly"derived"from"Para"rubber"tree"(Hevea"brasiliensis"Muell."Arg.),"a"big"tree"originated"innbsp;the"Amazon"basin"of"South"America."As"a"special"tissue"for"rubber"synthesis"and"storage,"the"laticiferous"cells"possess"no"plasmodesmata"with"neighboring"parenchyma"cells,"and"the"water"balance"is"mainly"mediated"by"PIP"aquaporins."In"previous"studies,"a"highly"abundant"PIP"gene"denoted"HbPIP1;4"was"identified,"however,"no"detectable"water"transport"activity"was"found"when"heterologously"expressed"in"Xenopus"laevis"oocytes,"which"may"be"due"to"its"inability"to"localize"to"the"cell"membrane."To"uncover"the"acting"site"and"multimerization"features"of"HbPIP1;4"in"vivo,"recombinant"plasmids"pNC-Cam1304-SubN-HbPIP1;4,"pNC-BiFC-ECN-HbPIP1;4,"and"pNC-BiFC-ENN-"HbPIP1;4"for"subcellular"localization"and"bimolecular"fluorescence"complementation"(BiFC)"were"successfully"constructed."Agrobacterium"tumefaciens"transformed"with"above"recombinant"plasmids"were"used"to"infiltrate"tobacco"(Nicotiana"benthamiana),"and"transiently"transformed"leaves"were"subsequently"checked"using"laser"confocal"microscopy."Compared"with"wide"distribution"of"fluorescence"signals"throughout"the"cell"for"the"control"pNC-Cam1304-SubN,"signals"of"pNC-Cam1304-GFP-HbPIP1;4"were"restricted"to"the"cell"membrane,"supporting"the"plasma"membrane"localization"of"HbPIP1;4,"which"is"consistent"with"the"bioinformatics"prediction."The"result"was"further"supported"by"the"BiFC"analysis,"which"also"implied"that"HbPIP1;4"could"form"homomultimer,"in"accordance"with"the"3D"prediction"via"homology"modeling."The"results"would"lay"a"solid"foundation"for"further"uncovering"the"mechanism"of"water"balance"of"the"laticifer."Nevertheless,"PIP"aquaporins"that"could"interact"with"HbPIP1;4"in"rubber"tree"remain"to"be"further"characterized.

        Keywords:"rubber"tree;"laticifer;"aquaporin;"plasma"membrane"intrinsic"protein;"subcellular"localization;"BiFC

        DOI:"10.3969/j.issn.1000-2561.2024.06.001

        質(zhì)膜內(nèi)在蛋白(plasma"membrane"intrinsic"protein,"PIP)隸屬于水通道蛋白(aquaporin,"AQP)家族,其以細胞膜定位并具有高效的水分轉(zhuǎn)運活性而著稱[1]。相比于其他亞族,PIP高度保守,僅包含2個進化小組,其中PIP1具有延伸的N端,而PIP2具有較長的C端[2-5]。結(jié)構(gòu)分析顯示,PIP包含6個跨膜螺旋、2個半螺旋以及半螺旋上高度保守的NPA基序,其在細胞膜上以四聚體的形式起作用[6-8]。雖然PIP1和PIP2都具有便于水分轉(zhuǎn)運的F-H-T-R"ar/R選擇性濾器,但PIP1在蟾蜍卵母細胞、酵母等體外體系中一般無活性或活性極低,其主要原因是PIP1不能有效定位到細胞膜[9-11]。然而,當PIP1與PIP2共表達時,PIP2可介導PIP1的有效定位,從而提高水分轉(zhuǎn)運活性[9-12]。

        巴西橡膠樹(Hevea"brasiliensis"Muell."Arg.)起源于南美亞馬遜河流域,是天然橡膠的主要商業(yè)來源[13]。橡膠在橡膠樹的乳管細胞中特異合成和儲藏,并在割膠過程以膠乳的形式被排出[14]。由于乳管與鄰近的薄壁細胞之間不存在胞間連絲,故水分出入乳管主要由細胞膜定位的PIP介導[2]。前期的全基因組分析顯示,橡膠樹共含有15個PIP基因,其中包含5個PIP1和10個PIP2[2]。蛋白互作分析顯示,隸屬于PIP2的HbPIP2;3可形成同源多聚體[15],然而,隸屬于PIP1的HbPIP1;1雖然在植物體內(nèi)也定位在細胞膜,卻并不能形成同源多聚體[16]。為探究HbPIP1;1不能形成同源多聚體是屬于亞類特征還是個體特性,本研究對另外一個PIP1成員HbPIP1;4[2,"17]進行亞細胞定位和多聚化分析,并通過序列比較以期為揭示潛在的分子機理奠定基礎(chǔ)。

        1""材料與方法

        1.1""材料

        1.1.1""植物材料""橡膠樹品系熱研7-33-97種植于中國熱帶農(nóng)業(yè)科學院試驗場,膠乳的采集參照文獻[2];本氏煙草(Nicotiana"benthamiana)的栽培與管理參照文獻[16]。

        1.1.2""菌株及載體""大腸桿菌(Escherichia"coli)DH5α、內(nèi)含輔助質(zhì)粒pSoup-P19的根癌農(nóng)桿菌(Agrobacterium"tumefaciens)GV3101、pNC-"Cam1304-SubN、pNC-BiFC-ENN和pNC-BiFC-"ECN由本實驗室保存。

        1.1.3""主要試劑""酶、試劑盒及各類生化試劑參照文獻[16,"18]。

        1.2""方法

        1.2.1""總RNA提取與反轉(zhuǎn)錄""膠乳總RNA的提取采用改良的SDS法[2],經(jīng)質(zhì)量檢測合格后用TaKaRa反轉(zhuǎn)錄試劑盒PrimeScript?"RT"reagent"Kit"with"gDNA"Eraser合成cDNA第一鏈。

        1.2.2""基因克隆與載體構(gòu)建""根據(jù)前期鑒定的HbPIP1;4基因序列[2]及本地的熱研7-33-97的基因組序列設(shè)計引物對HbPIP1;4F/R(ATGGAGGG-"CAAGGAAGAGGATG/GGCCCTGGCCTTGAAA-"GG)和pNC-HbPIP1;4F/R(AGTGGTCTCTGTCC-"AGTCCTATGGAGGGCAAGGAAGAGGATG/GG-"TCTCAGCAGACCACAAGTGGCCCTGGCCTTG-"AAAGG),并以上述反轉(zhuǎn)錄cDNA作為模板進行PCR擴增。參照文獻[16],利用無縫克隆技術(shù)將HbPIP1;4構(gòu)建到載體pNC-Cam1304-SubN、pNC-"BiFC-ENN和pNC-BiFC-ECN。

        1.2.3""生物信息學分析""本研究所用數(shù)據(jù)庫、軟件及其網(wǎng)址詳見表1。同源分析和多序列比對分別采用BLAST和MUSCLE軟件;蛋白的理化特性、亞細胞定位、保守結(jié)構(gòu)域、二級結(jié)構(gòu)和3D結(jié)構(gòu)預(yù)測分別采用Protparam、WoLF"PSORT、CDD、SOPMA和SWISS-MODEL軟件??缒ぢ菪齾^(qū)及保守氨基酸基于與SoPIP2;1[6]、AtPIP2;1[7]和AtPIP2;4[8]的序列比對進行界定。

        1.2.4""亞細胞定位和雙分子熒光互補(bimolecu-"lar"fluorescence"complementation,"BiFC)實驗""參照文獻[19-20],采用凍融法將上述重組質(zhì)粒導入農(nóng)桿菌感受態(tài),挑選單克隆進行菌落PCR驗證后制備農(nóng)桿菌浸染液,采用微量注射法轉(zhuǎn)化4周齡的煙草葉片,遮光保濕48"h后制片,并用激光共聚焦顯微鏡Zeiss"LMS880進行熒光觀察。

        2""結(jié)果與分析

        2.1""載體構(gòu)建與序列比較

        本研究首先以HbPIP1;4F/R為引物對基因的編碼區(qū)序列進行分離,目的條帶切膠回收后用于第二輪PCR擴增,并利用無縫克隆技術(shù)成功構(gòu)建了亞細胞定位載體pNC-Cam1304-SubN-HbPIP1;4以及BiFC載體pNC-BiFC-ENN-HbPIP1;4和pNC-BiFC-ECN-HbPIP1;4。桑格測序顯示,研究分離到的序列與基因組的對應(yīng)區(qū)域完全一致,預(yù)測編碼287個氨基酸(aa),其理論分子量(MW)、等電點(pI)、脂肪族指數(shù)(AI)、總平均疏水指數(shù)(GRAVY)和不穩(wěn)定系數(shù)(II)與HbPIP1;1、HbPIP2;3、SoPIP2;1、AtPIP2;1、AtPIP2;4相當(表2);該蛋白的第44~274位為保守的MIP結(jié)構(gòu)域(pfam00230),共包含230個殘基(圖1A);從氨基酸組成來看,蛋白的小分子氨基酸A和G含

        量最高,分別為12.5%和11.5%(圖1B)。HbPIP1;4與HbPIP1;1、HbPIP2;3、SoPIP2;1、AtPIP2;1、AtPIP2;4的序列相似性分別為91.0%、76.0%、72.6%、72.8%和70.2%,其跨膜螺旋區(qū)(TM1~TM6)和保守氨基酸如圖1C所示,2個半螺旋區(qū)(HB和HE)含有典型的NPA基序;連環(huán)LA含有1個與二聚化相關(guān)的C82殘基;連環(huán)LB含有1個保守的磷酸化位點S128;連環(huán)LD含有1個與門控相關(guān)的L211殘基;ar/R選擇性濾器為F94-H224-T231-R239;Froger位點為E154-S240-A244-"F259-W260。與SoPIP2;1、AtPIP2;1、AtPIP2;4和HbPIP2;3相比,HbPIP1;4具有較長的N端和較短的C端,缺乏磷酸化調(diào)控相關(guān)的C端S殘基。二級結(jié)構(gòu)預(yù)測顯示,這些蛋白均以α-螺旋和無規(guī)則卷曲為主,分別為30.24%~40.42%和37.98%~"47.74%(表2)?;赟oPIP2;1的同源建模顯示,HbPIP1;4可以形成同源四聚體(圖1D)。

        2.2""亞細胞定位分析

        為明確HbPIP1;4的功能執(zhí)行部位,研究以空載pNC-Cam1304-SubN為對照,將含pNC-"Cam1304-SubN-HbPIP1;4的農(nóng)桿菌工程菌微量注射煙草葉片,共聚焦觀察結(jié)果如圖2所示,對照的熒光信號散布于整個細胞,而實驗組僅見于細胞膜,證實HbPIP1;4的作用部位是細胞膜。

        2.3""BiFC分析

        為明確HbPIP1;4是否可形成同源多聚體,研

        究以轉(zhuǎn)pNC-Cam1304-SubN-HbPIP1;1[2]的農(nóng)桿菌工程菌為陽性對照,單轉(zhuǎn)pNC-BiFC-ENN-"HbPIP1;4或pNC-BiFC-ECN-HbPIP1;4的為陰性對照,將轉(zhuǎn)pNC-BiFC-ENN-HbPIP1;4和pNC-"BiFC-ECN-HbPIP1;4的農(nóng)桿菌工程菌等量混合后瞬時轉(zhuǎn)化煙草葉片。共聚焦觀察結(jié)果如圖3所示,陽性對照和實驗組在細胞膜均發(fā)現(xiàn)強烈的熒光信號,而陰性對照均無信號,證實HbPIP1;4可在細胞膜上形成同源多聚體。

        3""討論

        與其他作物相比,橡膠樹的水分平衡顯得更為重要:首先,除蒸騰耗水外,周期性的割膠活動會造成水分的大量流失;其次,相對于多數(shù)植物鄰近的細胞間存在大量的胞間連絲,用于割膠的成熟乳管與鄰近細胞缺乏功能性的胞間連絲,這使得乳管水分的補給嚴重依賴于細胞膜定位的PIP[2,"14]。在橡膠樹的15個PIP基因中,有10個在乳管中有表達,其中包括HbPIP1;4、HbPIP2;3和HbPIP1;1[2]。在蟾蜍卵母細胞中的功能分析顯示,HbPIP2;3具有高效的水分轉(zhuǎn)運活性[17],而HbPIP1;4和HbPIP1;1的活性極低[17,"21]。根據(jù)在玉米、水稻、草莓等植物中的研究,PIP1亞類成員之所以在體外體系中無水分轉(zhuǎn)運活性主要歸因于其自身不能有效定位到細胞膜,相反,PIP2自身不僅可定位到細胞膜,還可介導PIP1的細胞膜定位[9-12]。有意思的是,在前期的研究中,團隊發(fā)現(xiàn)HbPIP1;1與HbPIP2;3均定位在煙草葉片的細胞膜;HbPIP2;3可形成同源多聚體,而HbPIP1;1卻不能[15-16]。為探討HbPIP1;1不能形成同源多聚體的可能結(jié)構(gòu)特征,本研究進一步鑒定了HbPIP1;4的細胞膜定位和多聚化特征。據(jù)前期研究,HbPIP1;4在乳管中的表達水平顯著高于HbPIP2;3和HbPIP1;1[2]。亞細胞定位分析顯示,與HbPIP1;1和HbPIP2;3相同,HbPIP1;4也定位在煙草葉片的細胞膜;與HbPIP1;1不同的是,BiFC顯示HbPIP1;4可形成同源多聚體,這與3D結(jié)構(gòu)預(yù)測結(jié)果一致。系統(tǒng)的序列比較顯示,HbPIP1;4、HbPIP1;1、HbPIP2;3、SoPIP2;1、AtPIP2;1和AtPIP2;4均屬于穩(wěn)定的疏水型堿性蛋白,即等電點gt;7.0(8.22~9.03)、總平均疏水指數(shù)gt;0(0.334~0.579)、不穩(wěn)定系數(shù)為lt;40(27.46~"31.68);具有完全一致的NPA基序和ar/R選擇性濾器(F-H-T-R);對應(yīng)于SoPIP2;1"S115的磷酸化位點、L197的門控位點以及C69的二聚化位點高度保守;對應(yīng)于SoPIP2;1"S188的磷酸化位點僅在AtPIP2;1中保守,而在其他蛋白中均為N;在5個Froger位點中,僅P1存在變異,SoPIP2;1為M,AtPIP2;1、AtPIP2;4和HbPIP2;3為Q,HbPIP1;1和HbPIP1;4為E;相比其他蛋白,HbPIP1;1和HbPIP1;4均缺乏PIP2"C端的磷酸化位點。這些結(jié)果表明HbPIP1;4與HbPIP1;1的序列特征高度一致,而基于前期的研究結(jié)果很難通過序列比對找到?jīng)Q定同源多聚化的結(jié)構(gòu)特征。此外,研究還采用SWISS-MODEL預(yù)測了HbPIP1;4與HbPIP1;"1[16]、HbPIP2;3[15]和HbPIP2;7[22]的互作關(guān)系,發(fā)現(xiàn)它們都不能形成異源多聚體,不過這還有待進一步的實驗驗證;同時,本團隊已構(gòu)建了膠乳特異性的酵母雜交文庫,利用HbPIP1;4作為誘餌的篩選工作還在進行中。

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        • ZELAZNY"E,"BORST"J"W,"MUYLAERT"M,"BATOKO"H,"HEMMINGA"M"A,"CHAUMONT"F."FRET"imaging"in"living"maize"cells"reveals"that"plasma"membrane"aquaporins"interact"to"regulate"their"subcellular"localization[J]."Proceedings"of"the"National"Academy"of"Sciences,"2007,"104(30):"12359-"12364.
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        • 鄒智,"喬雪瑩,"鄭玉皎,"陽江華."橡膠樹HbPIP2;3的亞細胞定位與多聚化分析[J]."熱帶作物學報,"2024,"45(3):"443-449.ZOU"Z,"QIAO"X"Y,"ZHENG"Y"J,"YANG"J"H."Subcellular"localization"and"multimerization"analyses"of"HbPIP2;3,"an"efficient"water"transporter"from"Hevea"brasiliensis[J]."Chinese"Journal"of"Tropical"Crops,"2024,"45(3):"443-449."(in"Chinese)
        • 喬雪瑩,"鄭玉皎,"陽江華,"曾長英,"鄒智."橡膠樹HbPIP1;1基因的克隆及蛋白的亞細胞定位與多聚化分析[J]."熱帶作物學報,"2022,"43(12):"2405-2412."QIAO"X"Y,"ZHENG"Y"J,"YANG"J"H,"ZENG"C"Y,"ZOU"Z."Gene"cloning,"subcellular"localization"and"multimerization"analysis"of"HbPIP1;1"from"Hevea"brasiliensis[J]."Chinese"Journal"of"Tropical"Crops,"2022,"43(12):"2405-2412."(in"Chinese)

        [17]"AN"F,"ZOU"Z,"CAI"X"Q,"WANG"J,"ROOKES"J,"LIN"W"F,"CAHILL"D,"KONG"L"X."Regulation"of"HbPIP2;3,"a"latex-abundant"water"transporter,"is"associated"with"latex"dilution"and"yield"in"the"rubber"tree"(Hevea"brasiliensis"Muell."Arg.)[J]."PLoS"One,"2015,"10(4):"e0125595.

        [18]"鄒智,"楊禮富."巴西橡膠樹鐵硫簇支架蛋白cDNA的克隆與分析[J]."熱帶作物學報,"2010,"31(10):"1752-1756.ZOU"Z,"YANG"L"F."Cloning"and"analysis"of"a"cDNA"encoding"an"iron-sulfur"cluster"scaffold"protein"ISU1"from"Hevea"brasiliensis"Muell."Arg.[J]."Chinese"Journal"of"Tropical"Crops,"2010,"31(10):"1752-1756."(in"Chinese)

        [19]"徐碩,"鄒智,"肖艷華,"張麗,"孔華,"郭靜遠,"郭安平."油莎豆塊莖油脂積累相關(guān)基因CeWRI1的克隆與功能分析[J]."熱帶作物學報,"2022,"43(5):"923-929.XU"S,"ZOU"Z,"XIAO"Y"H,"ZHANG"L,"KONG"H,"GUO"J"Y,"GUO"A"P."Cloning"and"functional"characterization"of"CeWRI1,"a"gene"involved"in"oil"accumulation"from"tigernut"(Cyperus"esculentus"L.)"tubers[J]."Chinese"Journal"of"Tropical"Crops,"2022,"43(5):"923-929."(in"Chinese)

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