东南大学学报(医学版)
東南大學學報(醫學版)
동남대학학보(의학판)
JOURNAL OF SOUTHEAST UNIVERSITY(MEDICAL SCIENCE EDITION)
2013年
6期
663-669
,共7页
甘精胰岛素%多分子伴侣%共表达
甘精胰島素%多分子伴侶%共錶達
감정이도소%다분자반려%공표체
insulin glargine%molecular chaperones%co-expression
目的:构建甘精胰岛素( ING)表达载体,提高ING在大肠杆菌中的可溶性表达。方法:在传统方法中ING的A、B链之间用C肽连接,本实验在ING的A、B链之间插入大肠杆菌硫氧还蛋白质( Trx )来替代C肽,进行ING的融合表达( ING-Trx),并进一步使用多分子伴侣GroEL、GroES、触发因子进行共表达。结果:可溶性的ING-Trx融合蛋白约占该目的蛋白质总表达量的35%;多分子伴侣共表达后可溶性ING-Trx的产量提高到ING-Trx总蛋白的78%,初步纯化后其产量为4.5 mg· L-1,是使用分子伴侣前的3倍。结论:用Trx代替C肽不影响A、B链的有效折叠,采用分子伴侣共表达可以显著提高目的蛋白的可溶性。
目的:構建甘精胰島素( ING)錶達載體,提高ING在大腸桿菌中的可溶性錶達。方法:在傳統方法中ING的A、B鏈之間用C肽連接,本實驗在ING的A、B鏈之間插入大腸桿菌硫氧還蛋白質( Trx )來替代C肽,進行ING的融閤錶達( ING-Trx),併進一步使用多分子伴侶GroEL、GroES、觸髮因子進行共錶達。結果:可溶性的ING-Trx融閤蛋白約佔該目的蛋白質總錶達量的35%;多分子伴侶共錶達後可溶性ING-Trx的產量提高到ING-Trx總蛋白的78%,初步純化後其產量為4.5 mg· L-1,是使用分子伴侶前的3倍。結論:用Trx代替C肽不影響A、B鏈的有效摺疊,採用分子伴侶共錶達可以顯著提高目的蛋白的可溶性。
목적:구건감정이도소( ING)표체재체,제고ING재대장간균중적가용성표체。방법:재전통방법중ING적A、B련지간용C태련접,본실험재ING적A、B련지간삽입대장간균류양환단백질( Trx )래체대C태,진행ING적융합표체( ING-Trx),병진일보사용다분자반려GroEL、GroES、촉발인자진행공표체。결과:가용성적ING-Trx융합단백약점해목적단백질총표체량적35%;다분자반려공표체후가용성ING-Trx적산량제고도ING-Trx총단백적78%,초보순화후기산량위4.5 mg· L-1,시사용분자반려전적3배。결론:용Trx대체C태불영향A、B련적유효절첩,채용분자반려공표체가이현저제고목적단백적가용성。
Objective:To construct expression vector of insulin glargine ( ING) and increase soluble expression of ING.Methods: C peptide was used to join A chain and B chain of ING in previous studies .In the present research , thioredoxin ( Trx) was inserted between A chain and B chain of ING to replace C peptide .Co-expression of molecular chaperones GroEL , GroES, trigger factor and ING was also used to promote folding of recombinant ING-Trx protein.Results:Soluble ING-Trx accounts for 35% of total expressed ING-Trx while soluble ING-Trx increased to 78%of total ING-Trx protein after co-expression.The yield was about 4.5 mg· L-1 after preliminary purification , three times as much as the production without co-expression of molecular chaperones .Conclusion:In summary , A chain and B chain can fold properly when Trx is used to replace C peptide .Co-expression of ING-Trx with molecular chaperones can greatly increase soluble expression of insulin glargine .