CN103045486B - 再育镰刀菌zjb-09150及在生物合成烟酸中的应用 - Google Patents
再育镰刀菌zjb-09150及在生物合成烟酸中的应用 Download PDFInfo
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- CN103045486B CN103045486B CN2012103866702A CN201210386670A CN103045486B CN 103045486 B CN103045486 B CN 103045486B CN 2012103866702 A CN2012103866702 A CN 2012103866702A CN 201210386670 A CN201210386670 A CN 201210386670A CN 103045486 B CN103045486 B CN 103045486B
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- nicotinic acid
- bacteria
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- proliferation sickle
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Abstract
本发明公开了一种再育镰刀菌(Fusarium proliferatum)ZJB-09150及在生物合成烟酸中的应用,保藏于中国典型培养物保藏中心,地址:中国武汉,武汉大学,保藏编号CCTCC No:M 2011472,保藏日期2011年12月15日;所述合成烟酸的方法为:以再育镰刀菌ZJB-09150发酵培养获得的含酶湿菌体为催化剂,以3-氰基吡啶为底物,于pH7.0~10.0的缓冲溶液中构成转化反应体系,在35~55℃条件下进行转化反应,反应完全后,转化反应液即为含烟酸的混合液,混合液分离纯化获得所述烟酸;本发明提供新菌株再育镰刀菌ZJB-09150,该菌可有效生物催化生产烟酸,具有广泛的应用前景。
Description
(一)技术领域
本发明涉及一株产腈水解酶菌株--再育镰刀菌(Fusariumproliferatum)ZJB-09150,及其在烟酸合成中的应用。
(二)背景技术
烟酸(Nicotinic Acid),又称为3-吡啶甲酸(3-picoline acid),即维生素B3,是结构最简单,理化性质最稳定的一种维生素。烟酸为白色结晶或结晶性粉末,无臭或有微臭,水溶液呈酸性反应,熔点234~237℃。易溶于沸水和沸乙醇,溶于苛性碱、碳酸钠,不溶于乙醚和酯类。烟酸在医药、食品和饲料及化学工业中有着广泛的应用前途。烟酸在机体组织中的氧化还原过程中发挥重要作用,具有促进细胞新陈代谢和扩张血管的功能,能促进人体和动物的生长发育。烟酸作为药品可防治皮肤病和类似的维生素缺乏症,具有扩张血管的作用,用于医治末梢神经痉挛,动脉硬化等病症。烟酸还具有生理和化学活性的精细中间体、医药中间体,用它可以开发一系列高附加值的产品,如烟酸铬、烟酸肌醇酯、VE烟酸酯、2-氯烟酸等。因此对烟酸的研究具有重要的实际应用价值。
烟酸最初是通过尼古丁氧化制得的。目前合成多以烷基吡啶,如3-甲基吡啶、2-甲基-5-乙基吡啶、甲基戊二氰、6-羟基喹啉、萘和吡啶-3-甲醛等为原料。从合成方法看,可分为试剂氧化法、氨氧化法、气相氧化法、液相氧化法、电解氧化法、生物氧化法和光化学氧化法等。
(1)试剂氧化法:试剂氧化法是发展最早的制备烟酸的方法之一,使用的氧化剂有KMnO4、HNO3或NO2、浓H2SO4或SO3、H2SO4和HNO3、O3或H2O2等,其中以HNO3作为氧化剂最为普遍。3-甲基吡啶、2-甲基-5-乙基吡啶、喹啉、6-羟基喹啉、萘和植物中的尼古丁或盐碱的衍生物均可在上述氧化剂作用下生成烟碱,总收率为67-86%。
(2)氧气氧化法:日产化学工业株式会社以钴、锰及铈等金属的醋酸盐与溴的氢化物为催化剂,以纯氧或氧与其它惰性气体的混合物为氧化剂,在无溶剂的液相中氧化3-甲基吡啶得到烟酸,多次循环由3-甲基吡啶制得烟酸的转化率可达80%左右。
(3)氨氧化法:氨氧化法主要是以3-甲基吡啶或2-甲基-5-乙基吡啶为原料,用空气、氯气和水蒸气混合气体高温催化氧化,得到吡啶腈,然后在氨气和氢氧化钠的水溶液中水解得烟酸。氨氧化的催化剂有Mo,V,Fe,Ti,Zr等的磷酸盐V2O5/TiO2、Sb-V-Ti氧化物、VaTibZrcOx、V2O5/AlF3、Sb-V-SAPO-5等。氨氧化法原料价廉易得,可连续大规模生产。在常压或低压下反应,产率较高,纯度也较高,生产安全可靠,是工业上制备烟酸广泛采用的方法。其缺点是从原料烷基吡啶出发到制得产品至少需要两步以上的化学反应,且反应温度较高、催化剂制备有一定困难,不但加大了设备投资,而且增加了成本。
(4)空气氧化法:以空气或富氧空气做氧化剂,高温催化氧化3-甲基吡啶制得烟酸。所用的催化剂多数是五氧化二钒与铬、锡、铅、钛、铝、锆等氧化物的组合物或含氧酸化合物,如改性的V2O5,V2O5/ZrO2,V2O5/SnO2,V2O5/TiO2,还有用Cr1-xAlxVO4和CrV1-xPxO4等作催化剂的情况。由于催化剂不同.反应温度不同,一般烟酸的收率在61%~86.8%之间。
以上方法具有氧化剂价格昂贵,过程复杂,产物难分离,污染高及对生产设备要求也高等缺点。近年来生物技术领域的突破性进展,使生物催化在化学合成中日趋重要。利用腈转化酶生物催化生产酰胺、羧酸及其衍生物是一种非常有效的生产方法,可以极大地降低能耗、节省原料、减少污染,将生物技术应用于腈化合物的转化合成,已经引起人们的高度重视和关注。这一切给生物法生产烟酸的发展带来了机遇。
(三)发明内容
本发明目的是提供一株产腈水解酶的新菌株,及其在生物催化3-氰基吡啶制备烟酸中的应用。
本发明采用的技术方案是:
本发明提供一株产腈水解酶新菌株——再育镰刀菌(Fusariumproliferatum)ZJB-09150,保藏于中国典型培养物保藏中心,地址:中国,武汉,武汉大学,邮编430072,保藏编号CCTCC No:M2011472,保藏日期2011年12月15日。
所述再育镰刀菌ZJB-09150菌株是从来自浙江省内(杭州、金华、台州)等地100余份土样中,经初筛、复筛及分离纯化而得到的能高效的催化3-氰基吡啶制备烟酸的新菌株。根据它的生理生化特征,鉴定为再育镰刀菌(Fusarium proliferatum)。
所述再育镰刀菌ZJB-09150菌株的主要生理生化特征如下:
菌落形态:于28℃在PDA平板培养基培养4d,菌落直径5cm左右,菌落呈同心圆状,菌落周边白色绒毛状,内环浅褐色,中心有小突起。
生理生化特征:对碳源阳性利用项目:吐温40、N-乙酰-D-葡糖胺、β-环糊精、糊精、L-果糖、D-葡萄糖酸、甘油、肝糖、2-酮-D-葡萄糖酸、D-甘露醇、D-核糖、水杨苷、L-山梨糖、反丁烯二酸、L-乳酸、D-苹果酸、L-苹果酸、D-糖二酸、琥珀酸、L-丙氨酸、L-丙氨酰甘氨酸、L-天冬酰胺、L-天冬氨酸、L-谷氨酸、L-鸟氨酸、L-脯氨酸、L-焦谷氨酸、L-丝氨酸、L-苏氨酸、2-乙醇胺。
对碳源阴性利用项目:N-乙酰-D半乳糖胺、N-乙酰-β-D甘露糖胺、核糖醇、D-纤维二糖、a-环糊精、D-果糖、D-半乳糖、D-半乳糖醛酸、龙胆二糖、D-氨基葡萄糖、a-D-葡萄糖、a-D-葡萄糖-1-磷酸、葡糖醛酰胺、D-葡萄糖醛酸、m-肌糖、a-D-乳糖、乳果糖、麦芽糖醇、麦芽糖、麦芽三糖、D-松三糖、a-甲基-D-半乳糖苷、β-甲基-D-半乳糖苷、a-甲基-D-葡萄糖苷、β-甲基-D-葡萄糖苷、帕拉金糖、D-阿洛酮糖、D-棉子糖、L-鼠李糖、景天庚醛聚糖、水苏糖、蔗糖、D-塔格糖、D-海藻糖、松二糖、D-木糖、溴代琥珀酸、β-羟丁酸、Y-羟丁酸、β-羟基苯乙酸、a-酮戊二酸、D-乳酸甲酯、癸二酸、琥珀酸甲酯、N-乙酰-L-谷氨酸、L-丙氨酰胺、甘氨酰-L-谷氨酸、L-苯丙氨酸、腐胺、腺苷、尿苷、腺苷-5,-磷酸。
所述再育镰刀菌ZJB-09150菌株18S DNA扩增产物的实际长度为521bp,SEQ ID NO.1序列如下:
TCTACCTGATCCGAGGTCACATTCAGAAGTTGGGGGTTTAACGGCTTGGCCGCGCCGCGTACCAGTTGCGAGGGTTTTACTACTACGCAATGGAAGCTGCAGCGAGACCGCCACTAGATTTCGGGGCCGGCTTGCCGCAAGGGCTCGCCGATCCCCAACACCAAACCCGGGGGCTTGAGGGTTGAAATGACGCTCGAACAGGCATGCCCGCCAGAATACTGGCGGGCGCAATGTGCGTTCAAAGATTCGATGATTCACTGAATTCTGCAATTCACATTACTTATCGCATTTTGCTGCGTTCTTCATCGATGCCAGAACCAAGAGATCCGTTGTTGAAAGTTTTGATTTATTTATGGTTTTACTCAGAAGTTACATATAGAAACAGAGTTTAGGGGTCCTCTGGCGGGCCGTCCCGTTTTACCGGGAGCGGGCTGATCCGCCGAGGCAACAATTGGTATGTTCACAGGGGTTTGGGAGTTGTAAACTCGGTAATGATCCCTCCGCAGGTTA ACCCTACGGA G
本发明还提供所述再育镰刀菌ZJB-09150在生物转化合成烟酸中的应用,所述应用为:以再育镰刀菌ZJB-09150发酵培养获得的含酶湿菌体为催化剂,以3-氰基吡啶为底物,于pH7.0~10.0的缓冲溶液中构成转化反应体系,在35~55℃条件下进行转化反应,反应完全后,获得的转化反应液即为含烟酸的混合液,将混合液分离纯化,获得所述烟酸。
进一步,所述在35~55℃条件下转化反应时间优选为10~120min。
进一步,所述反应体系中底物的初始终浓度为1.0~5.0g/L,所述再育镰刀菌ZJB-09150发酵培养获得的含酶湿菌体的质量用量以菌体干重计为2.5~5g/L。
进一步,所述催化剂按如下步骤获得:
(1)斜面培养:将再育镰刀菌ZJB-09150接种至斜面培养基,在28~30℃培养72~84h,获得斜面菌体;所述斜面培养基的终浓度组成为葡萄糖10.0~20.0g/L,酵母膏3.0~6.0g/L,氯化钠1.0~2.0g/L,K2HPO4·3H2O0.2~0.4g/L,MgSO40.2~0.4g/L,琼脂15.0~20.0g/L,pH6.5~7.0,溶剂为水;
(2)种子培养:从斜面菌体挑取一接种环菌体接种至种子培养基,28~30℃培养60~72h,得到种子液;所述种子培养基终浓度组成为:葡萄糖10.0~20.0g/L,酵母膏3.0~6.0g/L,氯化钠1.0~2.0g/L,K2HPO4·3H2O0.2~0.4g/L,MgSO40.2~0.4g/L,pH6.5~7.0,溶剂为水;
(3)发酵培养:将步骤(2)获得的种子液以2~6%体积比接种至发酵培养基,在28~30℃、初始pH6.5~7.0条件下震荡培养72~96h,培养液离心分离,弃去上清,取沉淀即得到所述含酶湿菌体;所述发酵培养基终浓度组成为:蔗糖3.0~6.0g/L,牛肉膏2.0~4.0g/L,NaNO32.0~4.0g/L,K2HPO4·3H2O0.1~0.2g/L,MgSO4·7H2O0.5~1.0g/L,KCl0.5~1.0g/L,FeSO4·7H2O0.02~0.04g/L,己内酰胺4.0~8.0g/L,pH6.5~7.0,溶剂为水。
进一步,所述混合液分离纯化的方法为:转化结束后,将转化反应液离心,弃沉淀,取上清液用孔径0.45μm微滤膜过滤,滤液抽真空浓缩至无溶剂流出,取浓缩物加入无水乙醇,冷却结晶,取晶体干燥,获得所述烟酸。
更进一步,所述再育镰刀菌ZJB-09150在生物转化合成烟酸中的应用按如下步骤进行:将再育镰刀菌ZJB-09150发酵培养获得的含酶湿菌体与3-氰基吡啶混合,于pH9.0的Tris-HCl缓冲溶液中构成转化反应体系,在55℃条件下转化反应10min,反应结束后,获得的转化反应液即为含所述烟酸的混合液,将混合液在10000rpm离心10min,弃沉淀,取上清液用孔径0.45μm微滤膜过滤,滤液真空浓缩至无溶剂流出,取浓缩物加入无水乙醇,冷却结晶,取晶体干燥,获得所述烟酸;所述再育镰刀菌ZJB-09150发酵培养获得的含酶湿菌体的质量用量以菌体干重计为2.5g/L,所述3-氰基吡啶的初始终浓度为1.2g/L。
本发明所述再育镰刀菌ZJB-09150含酶湿菌体制备方法推荐为:
(1)斜面培养:将再育镰刀菌ZJB-09150接种至斜面培养基,28℃培养72h,获得斜面菌体;所述斜面培养基终浓度组成为:葡萄糖10.0g/L,酵母膏3.0g/L,氯化钠1.0g/L,K2HPO4·3H2O0.2g/L,MgSO40.2g/L,琼脂15.0g/L,pH7.0,溶剂为水;
(2)种子培养:从步骤(1)斜面菌体挑取一环菌体,接种至50.0ml无菌种子培养基,28℃条件下培养72h,获得种子液;种子培养基终浓度组成为:葡萄糖15.0g,酵母膏5g,氯化钠1.5g,K2HPO4·3H2O0.3g,MgSO40.3g,pH7.0,水补足至1.0L,培养基121℃灭菌20分钟;
(3)发酵培养:将步骤(2)获得的种子液以体积比5%的接种量接种至发酵培养基,28℃、、初始pH6.5~7.0、150rpm条件下震荡培养96h,收集发酵液,10000rpm离心10min后,弃上清收集湿菌体,湿菌体用质量浓度0.95%生理盐水洗涤3次,收集的菌泥即为含酶湿菌体,具有3-氰基吡啶水解活性的生物催化剂,4℃冰箱保藏、备用;所述发酵培养基终浓度组成为:蔗糖3.0g/L,牛肉膏2.0g/L,NaNO32.0g/L,K2HPO4·3H2O0.1g/L,MgSO4·7H2O0.5g/L,KCl0.5g/L,FeSO4·7H2O0.02g/L,己内酰胺4.0g/L,pH7.0,溶剂为水。
本发明所述再育镰刀菌ZJB-09150发酵培养获得的含酶湿菌体的菌体干重测量方法为:测量单位菌浊度、单位体积的菌体细胞干重,得OD600与菌体细胞干重的关系曲线,可以获得各阶段的菌体干重。
本发明所述检测产物烟酸的高效液相色谱条件为:日本岛津液相色谱仪,不锈钢填充柱,填料为C18,长0.25m,内径4.6mm,流速1ml/min,柱温室温,流动相为乙腈:0.1%磷酸水溶液(25V:75V),进样量为10μl。其中,烟酸出峰时间为4.2min。采用外标法确定样品中烟酸的含量。
本发明的有益效果主要体现在:(1)本发明从微生物群中筛选得到可生物催化生产烟酸的新菌株再育镰刀菌ZJB-09150(Fusariumproliferatum)CCTCC NO:M2011472,其在适合条件下,能有效生产烟酸;(2)本发明将再育镰刀菌ZJB-09150用于生物催化生产烟酸实验,结果表明,该菌可有效生物催化生产烟酸,15分钟内60mM3-氰基吡啶转化率可达到100%,因此该菌在生物催化生产烟酸的领域中具有广泛的应用前景。
(四)附图说明
图1为菌株ZJB-09150单菌落形态照片(放大倍数10×100);
图2为菌株ZJB-09150单菌落扫描电镜图(放大倍数1×12000);
图3为菌株16S rDNA序列PCR扩增的琼脂糖凝胶电泳图;
图4为ZJB-09150菌株与NCBI上的菌株的进化树分析结果。
(五)具体实施方式
下面结合具体实施例对本发明进行进一步描述,但本发明的保护范围并不仅限于此:
实施例1:新菌株ZJB-09150的筛选
从将由浙江省杭州市某药厂附近采集的土样和污水样接种到富集培养基中;在28℃,150rpm的摇床上富集培养72h后,再取2ml培养液接种到新鲜的富集培养基上进行二次培养,如此重复3个循环。最后一次培养液稀释后涂布到葡萄糖酵母膏平板培养基上,28℃培养72h获得单菌落,挑取单菌落接种到斜面培养基进行保藏。从斜面培养基挑取一接种环菌种接种到发酵培养基,在28℃、初始pH6.5~7.0条件下震荡培养96h,离心分离,弃去上清,取沉淀即得到含酶湿菌体;将含酶湿菌体分别悬浮于pH7.0磷酸缓冲液中,通过加入3-氰基吡啶作为底物进行转化实验。将上述0.1g含酶湿菌体分别加入初始终浓度为10mM的3-氰基吡啶的磷酸缓冲液的反应体系中,35℃反应30分钟后,将反应液离心,取上清液分别用高效液相色谱检测烟酸的含量,选择有转化活性的菌株,最终选择出一株转化活性最高的菌株(编号为ZJB-09150,即CCTCC NO:M2011472)做后续的菌种鉴定及转化条件优化实验。
所述富集培养基配方为(终浓度):葡萄糖5g/l,K2HPO4·3H2O0.5g/l,KH2PO40.5g/l,MgSO40.5g/l,FeSO4·7H2O0.02g/l,己内酰胺4g/l,pH7.0,溶剂为水。培养基121℃,灭菌20min。
所述发酵培养基配方为(终浓度):蔗糖3g/l,牛肉膏2g/l,NaNO32g/l,K2HPO4·3H2O0.1g/l,MgSO4·7H2O0.5g/l,KCl0.5g/l,FeSO4·7H2O0.02g/l,己内酰胺4g/l,pH7.0,溶剂为水。
所述葡萄糖酵母膏平板培养基配方为(终浓度):蔗糖3g/l,牛肉膏2g/l,NaNO32g/l,K2HPO4·3H2O0.1g/l,MgSO4·7H2O0.5g/l,KCl0.5g/l,FeSO4·7H2O0.02g/l,己内酰胺4g/l,pH7.0,琼脂20g/L,溶剂为水。
实施例2:新菌株ZJB-09150的鉴定
实施例1中从土壤中经过富集培养然后用稀释涂布法,经过高效液相色谱检测筛选得到一株活性最强的菌株标号为ZJB-09150,单菌落的显微照片见图1所示,电镜扫描照片见图2所示,菌落直径3.7cm左右,呈同心圆状,菌落周边白色绒毛状,内环浅黄色,稍突起。
利用Biolog(GEN III)自动微生物鉴定系统对菌株ZJB-09150进行了94种表型测试(Biolog微生物自动鉴定专用试剂及培养基等购自Biolog公司),经Biolog读数仪分析代谢指纹,菌株ZJB-09150鉴定结果,如表1所示。
表1菌株ZJB-09150对Biolog GEN III板上71种碳源和23种化学物质的利用能力
在上述基础上,进一步将菌株ZJB-09150按《精编分子生物学实验指南方法》(F.M.奥斯伯主编,科学出版社,2008)提取染色体DNA,以提取到的细胞总DNA为模板,利用引物:p15'-TCCGTAGGTGAACCTGCCG-3'和p25'-TCCTCCGCTTATTGATATGC-3'扩增菌株的18S rDNA基因,扩增产物的凝胶电泳图见图3所示,将扩增产物同T载体连接后,委托上海皓嘉科技发展有限公司对该菌18SrDNA扩增及测序,得到该菌株的18S rDNA序列(SEQ ID NO.1所示)后,在NCBI网站上用BLAST检索GenBank中相关菌株的18S rDNA基因序列,并进行同源性比对;基于形态、生理生化特征和18S rDNA序列及系统发育学分析等方面的鉴定,将菌株ZJB-09150鉴定为再育镰刀菌,拟命名为再育镰刀菌ZJB-09150(Fusarium proliferatum ZJB-09150)。将18S rDNA测得的序列信息输入National Center BiontechnologyInformation中使用BLAST程序进行对比和进一步分析,然后使用相关软件对菌株进行序列比对和系统发育树的构建,结果见图4所示,可以帮助理解再育镰刀菌ZJB-09150的进化历史。
实施例3:生物催化剂再育镰刀菌ZJB-09150含酶湿菌体制备
(1)斜面培养:
将实施例2得到的再育镰刀菌ZJB-09150(F proliferatum)接种至斜面培养基,28℃培养72h,获得斜面菌体;所述斜面培养基终浓度组成为:葡萄糖10.0g/L,酵母膏3.0g/L,氯化钠1.0g/L,K2HPO4·3H2O0.2g/L,MgSO40.2g/L,琼脂15.0g/L,pH7.0,溶剂为水。
(2)种子培养:
从步骤(1)斜面菌体挑取一环菌体,接种至50.0ml无菌种子培养基,28℃条件下培养72h,获得种子液;种子培养基终浓度组成为:葡萄糖15.0g,酵母膏5g,氯化钠1.5g,K2HPO4·3H2O0.3g,MgSO40.3g,pH7.0,水补足至1.0L,培养基121℃灭菌20分钟。
(3)发酵培养:
将步骤(2)获得的种子液以体积比5%的接种量接种至发酵培养基,28℃、初始pH6.5~7.0、150rpm条件下震荡培养,在不同时间(48、54、60、72、78、84、96、108和120h)取样测定生物量和酶活(上述时间对应的生物量和酶活分别为3.4、5、7、8.2、8.3、8.3、8.4、7.9、6.7gDCW/l和0、5、11、21、43、75、126、102、91U/gDCW),因此选择最佳发酵培养时间为96h,收集培养时间为96h的发酵液,10000rpm离心10min后,弃上清收集湿菌体,湿菌体用质量浓度0.95%生理盐水洗涤3次,收集的菌泥即为含酶湿菌体,具有3-氰基吡啶水解活性的生物催化剂,4℃冰箱保藏、备用。
所述发酵培养基终浓度组成为:蔗糖3.0g/L,牛肉膏2.0g/L,NaNO32.0g/L,K2HPO4·3H2O0.1g/L,MgSO4·7H2O0.5g/L,KCl0.5g/L,FeSO4·7H2O0.02g/L,己内酰胺4.0g/L,pH7.0,溶剂为水。
实施例4:烟酸的制备
高效液相色谱条件为:日本岛津液相色谱仪,不锈钢填充柱,填料为C18,长0.25m,内径4.6mm,流速1ml/min,柱温室温,流动相为乙腈:0.1%磷酸水溶液(25V:75V),进样量为10μl。其中,烟酸出峰时间为4.2min。采用外标法确定样品中烟酸的含量。
将实施例3制备的含酶湿菌体(含酶湿菌体质量用量以菌体干重计为5.0g/L)与底物3-氰基吡啶1.23g(3-氰基吡啶初始终浓度为1.2g/L)混合,于pH9.0的Tris-HCl缓冲液10.0ml(50.0mM)中构成反应体系,在50℃转化反应15min,反应结束后,获得的转化反应液即为含烟酸的混合液,将混合液在10,000rpm离心10min,弃沉淀,收集上清液用孔径0.45μm微滤膜过滤,滤液进行高效液相色谱分析,实验进行3个平行,转化率分别为100%,99.3%和100%,产物烟酸浓度分别为10mM,9.93mM和10mM。
上清液用孔径0.45μm微滤膜过滤后的滤液通过真空浓缩至无溶剂流出,取浓缩物加入无水乙醇萃取,低温冷却结晶,可得烟酸晶体。
SEQUENCE LISTING
<110> 浙江工业大学
<120> 再育镰刀菌ZJB-09150及在生物合成烟酸中的应用
<130>
<160> 1
<170> PatentIn version 3.5
<210> 1
<211> 521
<212> DNA
<213> Fusarium proliferatum
<400> 1
tctacctgat ccgaggtcac attcagaagt tgggggttta acggcttggc cgcgccgcgt 60
accagttgcg agggttttac tactacgcaa tggaagctgc agcgagaccg ccactagatt 120
tcggggccgg cttgccgcaa gggctcgccg atccccaaca ccaaacccgg gggcttgagg 180
gttgaaatga cgctcgaaca ggcatgcccg ccagaatact ggcgggcgca atgtgcgttc 240
aaagattcga tgattcactg aattctgcaa ttcacattac ttatcgcatt ttgctgcgtt 300
cttcatcgat gccagaacca agagatccgt tgttgaaagt tttgatttat ttatggtttt 360
actcagaagt tacatataga aacagagttt aggggtcctc tggcgggccg tcccgtttta 420
ccgggagcgg gctgatccgc cgaggcaaca attggtatgt tcacaggggt ttgggagttg 480
taaactcggt aatgatccct ccgcaggtta accctacgga g 521
Claims (7)
1.再育镰刀菌(Fusarium proliferatum)ZJB-09150,保藏于中国典型培养物保藏中心,地址:中国,武汉,武汉大学,邮编430072,保藏编号CCTCC No:M2011472,保藏日期2011年12月15日。
2.一种权利要求1所述再育镰刀菌ZJB-09150在生物转化合成烟酸中的应用,其特征在于所述应用为:以再育镰刀菌ZJB-09150发酵培养获得的含酶湿菌体为催化剂,以3-氰基吡啶为底物,于pH7.0~10.0的缓冲溶液中构成转化反应体系,在35~55℃条件下进行转化反应,反应完全后,获得的转化反应液即为含烟酸的混合液,将混合液分离纯化,获得所述烟酸。
3.如权利要求2所述再育镰刀菌ZJB-09150在生物转化合成烟酸中的应用,其特征在于所述35~55℃条件下转化反应时间为10~120min。
4.如权利要求2所述再育镰刀菌ZJB-09150在生物转化合成烟酸中的应用,其特征在于所述反应体系中底物的初始终浓度为1.0~5.0g/L,所述再育镰刀菌ZJB-09150发酵培养获得的含酶湿菌体的质量用量以菌体干重计为2.5~5.0g/L。
5.如权利要求2所述再育镰刀菌ZJB-09150在生物转化合成烟酸中的应用,其特征在于所述催化剂按如下步骤获得:
(1)斜面培养:将再育镰刀菌ZJB-09150接种至斜面培养基,在28~30℃培养72~84h,获得斜面菌体;所述斜面培养基的终浓度组成为葡萄糖10.0~20.0g/L,酵母膏3.0~6.0g/L,氯化钠1.0~2.0g/L,K2HPO4·3H2O0.2~0.4g/L,MgSO40.2~0.4g/L,琼脂15.0~20.0g/L,pH6.5~7.0,溶剂为水;
(2)种子培养:从斜面菌体挑取一接种环菌体接种至种子培养基,28~30℃培养60~72h,得到种子液;所述种子培养基终浓度组成为:葡萄糖10.0~20.0g/L,酵母膏3.0~6.0g/L,氯化钠1.0~2.0g/L,K2HPO4·3H2O0.2~0.4g/L,MgSO40.2~0.4g/L,pH6.5~7.0,溶剂为水;
(3)发酵培养:将步骤(2)获得的种子液以2~6%体积比接种至发酵培养基,在28~30℃、初始pH6.5~7.0条件下震荡培养72~96h,培养液离心分离,弃去上清,取沉淀即得到所述含酶湿菌体;所述发酵培养基终浓度组成为:蔗糖3.0~6.0g/L,牛肉膏2.0~4.0g/L,NaNO32.0~4.0g/L,K2HPO4·3H2O0.1~0.2g/L,MgSO4·7H2O0.5~1.0g/L,KCl0.5~1.0g/L,FeSO4·7H2O0.02~0.04g/L,己内酰胺4.0~8.0g/L,pH6.5~7.0,溶剂为水。
6.如权利要求2所述再育镰刀菌ZJB-09150在生物转化合成烟酸中的应用,其特征在于所述混合液分离纯化的方法为:转化结束后,将转化反应液离心,弃沉淀,取上清液用孔径0.45μm微滤膜过滤,滤液进行真空浓缩,浓缩物加入无水乙醇,冷却结晶,取晶体干燥,获得所述烟酸。
7.如权利要求5所述再育镰刀菌ZJB-09150在生物转化合成烟酸中的应用,其特征在于所述应用按如下步骤进行:将再育镰刀菌ZJB-09150发酵培养获得的含酶湿菌体与3-氰基吡啶混合,于pH9.0的Tris-HCl缓冲溶液中构成转化反应体系,在55℃条件下转化反应10min,反应结束后,转化反应液即为含所述烟酸的混合液,将所述混合液在10000rpm离心10min,弃沉淀,取上清液用孔径0.45μm微滤膜过滤,滤液真空浓缩,取浓缩物加入无水乙醇,冷却结晶,取晶体干燥,获得所述烟酸;所述再育镰刀菌ZJB-09150发酵培养获得的含酶湿菌体的质量用量以含酶湿菌体的菌体干重计为2.5g/L,所述3-氰基吡啶的初始终浓度为1.2g/L。
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