摘要
Lactobacillus casei Zhang是从内蒙古地区传统发酵乳制品中分离到的一株具有优良益生性状的干酪乳杆菌,其对酸和胆盐具有较强的耐受性,同时具有抗菌、抗氧化和免疫调节等益生特性,是乳酸菌研究和益生菌开发利用的理想菌株。
以牛乳作为培养基来生产益生茵发酵乳制品得到了世界上研究者和市场的普遍认可。本研究结果显示,接种量(1×107CFU/mL)相同时,L. casei Zhang在豆乳中的生长速度显著快于牛乳(P<0.05),至发酵终点(pH4.5)所需时间J分别为14.5h和18h;发酵结束后,豆乳中活菌数可达109.10±0.08CFU/mL,显著高于牛乳中活菌数(108.24±0.09CFU/mL)(P<0.05).这一结果表明L. casei Zhang在豆乳中生长好于牛乳中,或许用豆乳作为基料生产益生菌发酵制品较牛乳更为合适。
为了探明L. casei Zhang在牛乳和豆乳中的生长机理,本研究依据其基因全序列,采用其基因组表达谱芯片和双向凝胶电泳、质谱技术,从基因转录组学和蛋白质组学水平对这一机理进行了研究。
转录组学分析表明,L. casei Zhang在牛乳中生长和发酵过程中,在稳定生长期(pH4.5)较对数生长期(pH5.2)共有84个基因显著表达,其中59个表达显著上调控基因中(P<0.05),40.5%与碳水化合物和能量代谢相关;而豆乳生长和发酵过程中,对数生长期(pH5.2)较迟滞生长期(pH6.4)有162基因表达显著不同(P<0.05),稳定生长期(pH4.5)较对数生长期(pH5.2)有63个基因表达显著不同(P<0.05),其中对数生长期48.6%的表达上调控基因(93个)与氨基酸的转运和代谢有关,稳定生长期48.8%的表达上调控(46个)与氨基酸转运和代谢相关。
蛋白质组学分析表明,L. casei Zhang在豆乳中生长,较牛乳共有144个差异表达蛋白点,其中迟滞生长期(pH6.4)34个,对数生长期(pH5.2)64个,稳定生长期(pH4.5)46个,三个时期表达上调控蛋白点分别为24个、34个和33个,编码这些表达上调控蛋白质的基因主要参与氨基酸和核苷酸的转运和代谢。
进一步分析表明,L. casei Zhang在牛乳生长过程中,主要上调控基因与PTC系统和磷酸戊糖途径PPP相关:而在豆乳生长过程中,主要上调控基因与蛋白水解酶系统(胞外蛋白酶PrtP、寡肽转运系统Opp和胞内肽酶Pep)、氨基酸(谷氨酸gιn、赖氨酸ιyS和甲硫氨酸met)和核苷酸(嘌呤Pur和嘧啶Pyr)代谢相关,尤其是蛋白水解酶系统的活跃表达,使得L. casei Zhang在豆乳能够分解大豆蛋白质为自身的生长提供充足氨基酸和核苷酸,这可能是其在豆乳中生长优于牛乳的主要原因。
本课题从基因水平上揭示L. casei Zhang在牛乳和豆乳中生长代谢机制,指出由于对牛乳和豆乳体系中蛋白质的水解和氨基酸的代谢不同,使其生长有所差异。
Lactobacillus casei Zhang is a well-recognized probiotic, which was isolated from traditional fermented milk products in Inner Mongolia area, it showed strong tolerance to acid and bile salt in vitro and antibacterial, antioixdantive and immune-regulatory effects in vivo, suggesting that it was an ideal strain for probiotic research.
Milk material is a kind of favorable carrier for probiotic, which has generally recognized by researchers and the market in the world. Results revealed that growing speed of L. casei Zhang was significantly higher in soy milk than bovine milk under the same inoculum (1×107CFU/mL). What is more, the fermentation time (to pH4.5) required was respectively14.5h and18h. At the end of fermentation, the living number of L. casei Zhang in soy milk (109.10±0.08CFU/mL) was Significantly higher than bovine milk (108.24±0.09CFU/mL), suggesting that growing of L. casei Zhang was better in soy milk than bovine milk. Perhaps, it is more suitable for soy milk to product probiotic fermented products than bovine milk.
According to complete genomic sequences of L. casei Zhang, growing mechanisms of L. casei Zhang in soy milk and bovine milk were analyzed from transcriptomics and proteomics through microarray biochip,2-dimensional gel electrophoresis and mass spectrum technique.
Result from transcriptomic analysis showed that the expressions of84genes in stationary phase (pH4.5) were significantly higher than these in exponential phase (pH5.2) during bovine milk fermentation. Among these, the expressions of59genes were significantly upregulated (P<0.05) and40.5%of upregulated genes was associated with carbohydrate and energy metabolism.During soy milk fermentation, in comparison with exponential phase (pH5.2),162genes in lag phase (pH6.4) and63genes in stationary phase (pH4.5) were significantly expressed (P<0.05). Furthermore,48.6%of upregulated genes (93genes) in exponential phase was associated with amino acid transport and metabolism while48.8%significantly regulated genes (46genes) in stationary phase was associated with amino acid transport and metabolism.
Result from proteomic analysis showed that a total of144protein spots were differently expressed including34spots in lag phase (pH6.4),64spots in exponential phase (pH5.2) and46spots in stationary phase (pH4.5) during growing of L. casei Zhang in soy milk compared to bovine milk. Furthermore,2-fold upregulated expression spots in three phases were respectively24,34and33. Most upregulated proteins related genes were associated with nucleotide and amino acids transport and metabolism.
Further analysis revealed that when L. casei Zhang is growing in bovine milk, the key upregulated genes were associated with PTC system and Pentose Phosphate Pathway; while in soy milk, associated with protein hydrolysis enzyme system (PrtP, Opp and Pep), amino acids (gln, lys and met) and nucleotide (Pur and Pyr), especilly the active expression of protein hydrolysis enzyme system. It makes that L. casei Zhang can decompose soybean protein and provide adequate amino acids and nucleotide for itself, which is the main explanation for well-growing L. casei Zhang in soy milk.
This study revealed the mechanisms of growing and metabolism of L. casei Zhang in bovine milk and soy milk at genetic level, and pointed out that growing differences were main due to different protein hydrolysis and amino acids metabolism within bovine and soy milk system.
引文
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