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水母雪莲(S.Medusa Maxim)类黄酮合成及抗逆相关基因克隆与查耳酮异构酶(CHI)基因的原核表达
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摘要
类黄酮类物质是雪莲药物的主要有效成分。植物类黄酮合成代谢途径的关键酶有苯丙氨酸裂解酶(PAL)、查耳酮合酶(CHS)、查耳酮异构酶(CHI)、黄烷酮3-羟化酶(F3H)等基因,以及一些调节基因如myb家族基因等。通过对这些基因的克隆和遗传转化,希望能够提高雪莲悬浮细胞及愈伤组织的类黄酮含量,为雪莲细胞大规模工业化发酵生产提供进一步的技术支持。
     雪莲是一类生长于高寒严酷环境中的特殊植物,它具有对多种严酷逆境很强的抗性。其中与抗逆有关的基因资源于作物生产具有非常大的利用价值。通过克隆及转化这些基因,可以大大提高资源植物及作物的逆境抗性。
     本实验主要克隆了多个与以上方面相关的基因cDNA及基因cDNA片段,进行了序列比较分析,并做了CHI基因的原核表达。同时对筛选文库的方法进行了改进,建立了两个文库筛选方法。重要结果如下:
     1、建立了一种分部分排除筛选文库的方法。
     通过对cDNA噬菌体平板划块分组,用PCR技术分部分检测排除来筛选文库。与其它筛选cDNA文库的方法相比,该方法范围可控,目标明确,能够明确地一步一步缩小目的基因的范围。而且筛选效率高、快速、简捷、省时。一般可在一周内筛选出目的基因。此方法用于同时筛选多个基因,可收到事半功倍的效果,对其它文库筛选也有借鉴意义。
     2、建立了用一对引物从文库筛选多个基因的方法。
     该方法利用已知序列设计引物,通过比较多个不同的基因序列,再根据这些基因之间相同或相近的部分设计引物,来同时筛选多个不同的基因。该方法主要用于从文库同时筛选克隆多个基因。
     3、克隆到雪莲CHI基因(GenBank注册号:AF509335)。
     CHI基因cDNA序列全长831bp,polyA信号(aataaa)在755bp-760bp之间。含有261个a、173个c、184个g、213个t,a、t总数占总碱基数的57%,有完整的阅读框,开放阅读框全长699bp。表明是该基因cDNA序列是完整的。序列间比较结果表明,与其它物种CHI基因同源性最高达85%。基因3′-端紧接着出现多个终止密码子,暗示该基因于代谢可能非常重要。该基因编码蛋白长232个氨基酸,分子量24913,预测PI为4.75。序列中的Ser和Thr含量占了接近20%。而Ala、Gly、Ile、Leu、Val四种非极性氨基酸数量占了大约37%。一个半胱氨酸(Cys)位于116位,一个组氨酸(His)位于197位。这两个氨基酸是否与CHI酶活性位点有关,需要进一步的验证。
     4、克隆到雪莲F3H基因(GenBank注册号:AF509338)。
     F3H基因cDNA序列全长1344bp,a、t碱基含量比c、g碱基高13.27%。嘌呤和嘧啶之间基本平衡。该序列中含有一个polyA信号(1297~1302),尾部有polyA。该蛋白共有343个氨基酸,分子量38843道尔顿,预测PI值为5.55。与其它的物种F3H基因序列比较,同源性均在30~40%,但有一些相对保守的区域。而用于比较的其它物种已知的F3H基因之间序列比较,同源性相对要比与雪莲比较的高得多(大约在60%以上)。
     蛋白质Blast比较,与茄子的加双氧酶、颠茄的天仙子胺-6-β-羟化酶、卡茄的2-酮戊
    
     水母宰莲类故酮合成及抗逆相关基因克隆与m 基因的原佰表达——摘 要
    二酸依赖的加双氧酶、天仙子的天仙子胺-6才加双氧酶、番茄的卜氨基环丙烷梭酸盐-卜氧
    化酶(铁缺乏蛋白)(IDS)、拟南芥的黄烷酮 3-羟化酶样蛋白、Fe(11)/抗坏血酸氧化酶有
    40~50%的同源性。与普通大麦的铁缺乏蛋白、拟南芥、水稻、白杉的乙烯形成酶、拟南芥
    的花色素合酶、无色花色素加双氧酶、黄烷酮合酶有30~40%的部分同源性。蛋白质结构域
    检索,与异青霉素 N-合酶有较高的结构域相似性。与 2-酮戊二酸-Fe(11)加氧酶
     (20-Felloxy)的部分结构域也有很好的相似性。推测该基因是雪莲类黄酮合成代谢特有
    的酶基因,它引导雪莲的特殊次生代谢物的合成。
     5、克隆到两个HSP70基因。
     其中全KHSP70基因cDNA(GenBank注册号:AF509336)K 2224hp,其氨基酸序列
    全长647,分于量为冗US道尔顿。预测pl值为4.95。另一条HSP70基囚C**A片段长
    14S4bP。比较二条序列发现具有如下的特点:①氨基酸除第7位A、V A换外,其余完全相
    同。②碱基序列有35个碱基不同,在这35个碱基之间,有22个是C、T之间的互换,9个
    是A、G之间的互换,2个A、T间互换,且个T、G间互换,1个C、G间互换。从中可以看
    出,碱基之间的变异主要集中在C、T和A、G之间,即瞟吟与瞟吟之间、啼陡和啼陡之间的
    互换,在膘吟与啼陡之间的互换很少。③从翻译后的情况来看,所有的35个差异碱基,除
    第一个变异碱基在三联体密码子的第二位不同,造成氨基酸A变为V,最后一个差异碱基在
    开放阅读框外以外,其余的33个差异碱基都在三联体密码子的第三位不同,没有造成氨基
    酸的突变。④通过与其它的 705 HSP蛋白序列比较来看,此变异较大的区域主要集中在氨基
    酸序列相对较保守的部位。⑤在 3’端,全序列比得到的部分序列多出了一段 22hP的碱基
     (序列为TTATTAATCTTTCTTGTCATGC),其中A、T碱基含量高达73%。
     6、获得了多个调节基因片段
     通过合成引物从文库扩增,?
Flavonoids are the main components for the medical effect in Sausurrea medusa. The key Enzymes for the synthesis pathway of plant flavonoids include phenylalanine ammonia-lyase (PAL), chalcone synthase (CHS), chalcone isomerase (CHI), flavanone 3-hydroxylase (F3H), and a number of regulatory genes as some Myb family genes mediate the transcriptional activation of the flavonoids biosynthesis. We hope to gain a higher production of flavonoids through transforming these genes into suspension cells of Sausurrea medusa, and provide a solid ground on technology for further large scale produce of suspension cells.
    Sausurrea medusa, which live in the high and inclement environments, have an excellent resistance character against many adversities. The genes that related to these resistance characters in Sausurrea medusa would be of great economic value on crop cultivation. We can improve the adversities resistance of resource plants and crops by transforming these genes into them.
    Several complete or partial genes cDNA were cloned from cDNA library of Sausurrea medusa, and two new methods for screening cDNA library were established in this paper. All the results as the following:
    1. Subsection method for cDNA library screening. With this method, cDNA phage plate was cut into several blocks, dilute each section using dilution buffer and detect them by PCR respectively. Then the target genes were obtained by screening cDNA library. Comparing with other methods, this method has many advantages such as controlled range and clear target, and also quick and simple for obtaining the target genes. It is possible to get a target gene in one week in general by this method. We can get twice the result with half the effort when we screen several genes in the same time. It is also suitable to screen other libraries.
    2. Another method-creening several genes from cDNA library using one pair of primers by PCR was brought forward here. In this method, a pair of primers have been designed basing on the same or the similar parts of several sequences, and been used to screen over two genes from cDNA library by PCR at the same time. It's a good method for cloning such genes involved some similar or same partial sequences, and could be applied to screening some other libraries.
    3. One chalcone isomerase gene (No: AF509335) was cloned from cDNA library. This gene involves 831bp, 57% a and t, a polyA signal, and one 31 bp polyA tail. One 699bp open reading
    
    
    
    -5 CHI jfflM)^^ - Abstract
    frame was found then. Putative protein includes 232 amino acids and 20% Ser and Thr, pi 4.15.
    4. A Flavanone 3-hydroxylase (No: AF509338) complete cDNA was isolated from cDNA library, which is 1344bp length in bases sequence, a and t are higher than c and g in bases content, a polyA signal and 31bp polyA be involved in it. Putative protein includes 343 amino acids, pi 5.55. Only 30-40% conserved parts have been found in the bases sequence comparing with other genes, which is far lower than that when comparing with each other in themselves. Some similar domains to Isopenicillin N synthase and partial similar domains to 2OG-Fe(II) oxygenase superfamily were found when Search the protein conserved domains in GenBank.. Protein Blast shows that it has 40-50% identities with dioxygenase (eggplant), hyoscyamine 6-beta-hydroxylase (Atropa belladonna), 2-oxoglutarate-dependent dioxygenase (Solanum chacoense), hyoscyamine (6S)-dioxygenase (henbane), hyoscyamine 6-beta-hydroxylase-like protein (Solanum tuberosum), flavanone 3-hydroxylase (Oryza sativa), flavanone 3-beta-hydroxylase (Arabidopsis thaliana), putative Fe(II)/ascorbate oxidase (Arabidopsis thaliana), and some other enzymes. These hint that this gene may functions as completely distinct action with such F3H we have known.
    5. One HSP70 gene complete cDNA (No: AF509336 ) and a partial cDNA were cloned from library. 2224bp be involved in the complete cDNA and 1484bp in the partial cDNA. Putative protein includes 647 amino acids in the complete HSP70, and its' MW is 70715 D, PI 4.95. Several charact
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