CN112831512A - 一种枣果实中腺苷酸环化酶的基因编码序列 - Google Patents
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Abstract
本发明公开了一种枣果实中腺苷酸环化酶的基因编码序列,编码腺苷酸环化酶(AC)的ZjAC4基因如SEQ ID No.1所示的DNA序列。本发明采用上述的一种枣果实中腺苷酸环化酶的基因编码序列,以高效合成cAMP,具有重要的应用价值。
Description
技术领域
本发明涉及腺苷酸环化酶技术领域,尤其是涉及一种枣果实中腺苷酸环化酶的基因编码序列。
背景技术
环磷酸腺苷(cyclic adenosine monophosphate,简称cAMP)是人体内广泛存在的一种具有重要生理活性的物质,其作为细胞内的第二信使,对糖代谢、脂肪代谢、核酸合成、蛋白质合成等发挥着重要的调节作用。临床上cAMP用于治疗慢性充血性心力衰竭、肺心病、心肌梗死、心肌炎及心源性休克;对改善风湿性心脏病的心悸、气急、胸闷等症状有一定的作用;可提高急性白血病结合化疗的疗效,亦可用于急性白血病的诱导缓解;此外,对老年慢性支气管炎、各种肝炎和银屑病也有一定疗效。cAMP也可作为药物中间体制备二丁酰环磷酸腺苷和环磷酸腺苷葡甲胺,提高脂溶性,从而发挥更有效的生理及药理作用。cAMP亦可用于畜禽饲料添加剂,在离体条件下模拟生长激素的作用,促进畜禽生长,增加优质禽产品产量。
其中,环磷酸腺苷(cAMP)合成的关键酶为腺苷酸环化酶(AC),AC能够催化ATP形成cAMP和焦磷酸(PPi)。AC类型多样,已知的AC包括AC-Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ和Ⅵ六大类,分布于原核生物、原生生物、真菌和动物中。但是,植物cAMP和AC基因研究较晚,目前仅有9个植物AC基因被报道,且这9个基因均来自于草本植物,木本植物中尚无报道,这与绝大多数植物中cAMP含量极其低不无关系,不过,枣果实中cAMP含量极高,说明枣中极有可能包含植物中合成cAMP的关键酶及基因。
发明内容
本发明的目的是提供一种枣果实中腺苷酸环化酶的基因编码序列,可以高效合成cAMP,具有重要的应用价值。
为实现上述目的,本发明提供了一种枣果实中腺苷酸环化酶的基因编码序列,编码腺苷酸环化酶(AC)的ZjAC4基因如SEQ ID No.1所示的DNA序列。
优选的,ZjAC4基因序列在AC基因研究中的应用。
因此,本发明采用上述一种枣果实中腺苷酸环化酶的基因编码序列,以高效合成cAMP,具有重要的应用价值。
下面通过附图和实施例,对本发明的技术方案做进一步的详细描述。
附图说明
图1是蛋白催化试验中的酶催化效率示意图;
图2是枣树在体瞬时表达试验中cAMP含量变化示意图;
图3是枣树在体瞬时表达试验中ZjAC4表达量变化示意图;
图4是大肠杆菌缺陷型互补试验结果图。
具体实施方式
以下通过附图和实施例对本发明的技术方案作进一步说明。
一、ZjAC4基因的获得
(1)根据NCBI数据库中已有报道的其它植物中的ACs基因的保守核苷酸序列,设计引物(正向:5’-ATGGAAGTCGAAGTCAAGCT-3’;反向:5’-GATCGAAAAACNGCAAATTTNG-3’);
(2)提取冬枣果实RNA,后反转录为cDNA作PCR扩增模板,进行PCR扩增;
PCR扩增程序:94℃,4min;(94℃,40s;55℃,45s;72℃,1.5min)35个循环;72℃,10min。
PCR产物经琼脂糖凝胶电泳观察扩增结果,并对候选目的条带进行琼脂糖凝胶回收,回收产物连接入pMDTM19-T克隆载体进行测序,得到ZjAC4序列,作为候选枣腺苷酸环化酶基因,进行功能验证。
二、功能验证
(1)大肠杆菌缺陷型互补试验
大肠杆菌cyaA缺陷型SP850菌株缺少腺苷酸环化酶(AC)基因,将带有ZjAC4基因的pET-15b重组质粒热机转化入SP850后,涂布与氨苄和卡纳抗生素培养皿,挑单克隆培养至OD600为0.5,后诱导表达培养4h,于麦康凯培养基划线培养,观察。结果发现,带有重组质粒的SP850缺陷型菌株和野生型大肠杆菌菌株的菌落颜色均为红色,而SP850缺陷型菌株在麦康凯培养基中显色为白色,说明ZjAC4基因弥补了SP850菌株中缺少的cyaA基因,发挥了腺苷酸环化酶基因的功能。
(2)蛋白质体外催化试验
将带有ZjAC4基因的pET-15b重组载体转入大肠杆菌BL21菌株,37℃,200rpm培养,后进行蛋白提取纯化,所得蛋白用于酶催化活性检测,结果如图1。结果发现,锰离子作为辅酶离子时,催化体系中产生了大量cAMP,说明ZjAC4蛋白能够有高效的AC功能,催化ATP形成cAMP。
酶催化活性检测条件如下。
催化体系:50mM TRIS-HCl(pH 7.5),0.5mM ATP和20mM辅酶金属离子,催化条件为30℃,20min。
催化完成后使用高效液相色谱(HPLC),检测催化体系中cAMP含量,从而确定酶催化活性及效率。
检测条件如下:色谱柱为Agilent Eclipse XDB-C18(4.6×250mm,5μm),柱温30℃,流动相为甲醇:20mmol磷酸二氢钾体积比10:90,检测波长254nm,进样体积20μm,流速0.8ml/min。
(3)枣树载体瞬时表达试验
将ZjAC4基因克隆到pCG3301植物过表达载体,并通过热激转化法转入农杆菌GV3101中并涂布于含利福平(50μg/ml)和卡那霉素(50μg/ml)的LB固体培养基中,后挑单克隆菌落于含同样抗生素的LB液体培养基中28℃,200rpm培养至菌液OD600=0.6。
收集菌体,重悬于10mM MES、10mM MgCl2和200mM乙酰丁香酮,pH6.0的注射侵染液中,取2mL注射于白熟期的冬枣果实中,注射后24h和72h取冬枣果实,检测ZjAC4基因的表达量及cAMP的含量,结果如图2-3所示。
结果发现,试验组(即注射重组后pCG3301)相较于空载组(pCG3301)及空白对照组,ZjAC4的表达量显著提升,同时cAMP的含量也显著提升。
因此,本发明采用上述一种枣果实中腺苷酸环化酶的基因编码序列,以高效合成cAMP,具有重要的应用价值。
最后应说明的是:以上实施例仅用以说明本发明的技术方案而非对其进行限制,尽管参照较佳实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对本发明的技术方案进行修改或者等同替换,而这些修改或者等同替换亦不能使修改后的技术方案脱离本发明技术方案的精神和范围。
序列表
<110> 河北农业大学
<120> 一种枣果实中腺苷酸环化酶的基因编码序列
<141> 2021-03-09
<160> 1
<170> SIPOSequenceListing 1.0
<210> 1
<211> 624
<212> DNA
<213> 腺苷酸环化酶基因(AC)(2 Ambystoma laterale x Ambystomajeffersonianum)
<400> 1
atgcattcga tggggacgga attgaaactt cggatccgag actccacggc gcactgccgt 60
ctcaccaagc ttttgtctgc atttcacgtc gaaactcaac accaagagaa tttcttcttt 120
gacggtgcca acaacgagct gtcatcacaa caagtcgtgc tcttccttcg gttctacggt 180
gatgacaccc cacaatgctt catgtcactc aaagccaggg cagtcctgga cgagggtgtg 240
tacagggttg atgaggaggt ggaagagaat ttcgagccag cggttgggcg cgcctgtgtc 300
gcccaaccgg agaagctttc gtcggtggag tgtgggatat tgaagatgtt aaaggagaag 360
tttggggttc tcaactttgt ggggcttgga gggtttgtca atgtgaggga tgtgtacaag 420
tgggagggct tgaaattgga ggttgataag actctgtatg agtttgggac taatcatgag 480
attgagtatg aaactagtga tcctgaagga gtcaagaagg tgcttgagga gttcttgaag 540
gagaatggga tccaatactc ttactcgcag gcctcaaagt ttgaggtttt tcgatccaag 600
aaacttccac agtcagtgaa ttga 624
Claims (2)
1.一种枣果实中腺苷酸环化酶的基因编码序列,其特征在于:编码腺苷酸环化酶(AC)的ZjAC4基因如SEQ ID No.1所示的DNA序列。
2.根据权利要求1所述的一种枣果实中腺苷酸环化酶的基因编码序列,其特征在于:ZjAC4基因序列在AC基因研究中的应用。
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