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Lawrence, A., Besir, H. Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid. J. Vis. Exp. (30), e1350, doi:10.3791/1350 (2009).
쿠매시 블리언트 블루 (CBB), 독성 및 인화성 유기 용제 (메탄올, 에탄올 또는 2 - 프로파놀)과 초산 높은 내용으로 솔루션을 사용하는 고전적인 단백질 얼룩 프로토콜에 얼룩 및 SDS 후 젤의 단백질 destaining, 고정에 사용됩니다 페이지. 짧은 시간 동안 전자렌지에 얼룩 솔루션을 가열, 절차를 속도를하는 것은 자주 사용됩니다. 독성 또는 유해 메탄올, 에탄올 또는 2 - 프로파놀 안전 고려 사항으로 인해 피해야한다 실험실에서 초산의 강한 냄새의 증발이 일반적으로 발생합니다. 원래 EM Wondrak (US2001046709 (A1), US6319720 (B1))하여 두 특허 출원에 발표된 프로토콜에서 얼룩 솔루션의 대체 성분이 더 용매 유기 또는 산성이 사용되지하는에 설명되어 있습니다. CBB는 bidistilled 물속에 녹아있는 것입니다 (CBB G - 250 당 리터의 60 80mg) 35 MM HCL은 얼룩 솔루션에서 유일하게 다른 화합물로 추가됩니다. 젤의 CBB의 staning는 bidistilled 물에 젤의 SDS - PAGE와 철저한 세척 후에 이루어집니다. 세탁 중에 젤 가열 및 단계를 얼룩으로, 프로세스는 빨리 완료 될 수 있으며, 아무런 독성 또는 유해 compunds이 증발되지 않습니다. 단백질 얼룩이 솔루션을 얼룩에 젤 가열 후 일분 이내에 이미 발생하고 완전히 스테인드 단백질에 영향을주지 않고, bidistilled 물속에 스테인드 젤의 장기간 세척하여 완전히 destained하는 약간 파란색 배경과 15-30 분 후에 개발 밴드.
CBB의 60-80 MG는 G - 250은 2-4시간에 대한 감동으로 bidistilled 물 1리터에 녹아 있습니다. 마지막으로, 집중 HCL 3 ML은 다른 분간 교반과 함께 진한 파란색 솔루션에 추가하고 나중에 사용하기 위해 어둠에 저장됩니다. 이 솔루션은 그 얼룩의 효율성을 잃지 않고 몇 개월까지 주 동안 최대 저장할 수 있습니다.
집중 HCL은 퓸 후드에서 사용하는 일반적인 치료 깨물어으로 취급해야합니다. 최종 솔루션은 산도 약 2 있으므로 장갑을 사용해야하고 피부와의 접촉을 피해야한다에있을 것입니다.
2 부 : SDS - PAGE
단백질 시료의 적절한 aliquots는 1X 로딩 버퍼의 최종 농도 버퍼를 읽어와 혼합됩니다. 우리는 125mM Tris/H3PO4 (25 ° C에서 산도 7.5), 2mM EDTA (에틸렌 다이아 민 테트라 초산), 4% SDS, 200mM DTT, 0.02 % bromophenol 파란색과 50 %의 글리세롤과 2X 로딩 버퍼를 사용합니다. SDS - PAGE 다른 로딩 버퍼 잘으로 사용할 수 있습니다.
세척 단계는 단백질의 효율적인 얼룩을 위해 중요하다. 2 분 또는 물 (<50ml)의 감소 볼륨 아래의 감소 세척 시간은 겔에 잔류 SDS 높은 금액으로 인한 가능성이 가장 높은 하늘색 단백질 밴드에 발생할 수 있습니다.
단백질은 질량 분광법으로 분석 될 경우, 전자 레인지에서 가열 단계는 생략한다, 10의 각 단계에서 분 및 밴드 강도까지 연장 얼룩 시간까지 확장 젤의 세탁 시간은 충분히 강하 . 질량 분석법에 의한 겔 매트릭스하기 때문에 단백질의 검출에 단백질의 crosslinking에서 젤 결과를 가열하는 것은 방해 수 있습니다.
대신 CBB G - 250, 한 Wondrak에서 원래 프로토콜에 따라 CBB R - 250을 사용할 수 있습니다. 우리 연구실에 CBB G - 250의 재고를했고이 염료와 함께 좋은 결과를 것처럼 우리는 옆에 두 염료 측면을 비교하지 않았습니다.
프로 시저의 속도와 세정 얼룩 단계에서 독성 또는 유해 용제의 누락이 프로토콜을 사용하기위한 가장 중요하고 설득력 요소입니다. 감도는 고전적인 CBB의 얼룩 프로토콜과 상업 CBB의 얼룩 솔루션의 동일한 범위에 표현 및 재조합 단백질의 정화 분야에서 우리의 SDS - PAGE 분석을위한 제한 요인되지 않았습니다.
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Hi, This is very clear and easy way of staining the gels. I would like to know the consequences of using acetic acid and organic solvents in staining the proteins electrophoresd using polyacrylamide gels, or what was is this method advantageous than the traditional coomassie staining using acetic acid and methanol ? your replies are appreciated
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Hi, as indicated in the article, the main factors for using this method are avoiding organic solvents and acetic acid for safety reasons and the speed of staining. This method has a lower sensitivity compared to longer protocols but for our applications the speed of staining compensates that. We haven't analyzed the effect of using organic solvents or acetic acid versus HCl in water, so I can't tell you if e.g. the fixation of the proteins in the gel is affected or more protein is dissolved from the gel leading to lower sensitivity. I hope this answers your questions. Best regards Hseyin
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Hi, May we have a pdf version of your method ? Also, at what temperature the solutions can be heated ? Is your method compatible with mass spectrometry-based micriosequencing ?
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Hi, there should be a link to the pdf-file on the page of the video. If you cant find it, please contact me at www.embl.de/services/core_facilities/pepcore/members/index.php?s_personId=4403. As described, we heat the gel in the microwave oven for about 10 sec so it's getting hot without boiling. I guess it's about 70-80C. As you may know, you should not heat a gel in the microwave if you want to do mass spec. afterwards as you will decrease the efficiency of extraction of protein bands from the gel. Additionally, the sensitivity of this fast method is lower than for some Coomassie protocols optimized for high sensitivity so it may not be ideal for very low protein amounts (<10 ng). Best regards
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Hi, there should be a link to the pdf-file on the page of the video. If you cant download it, please contact me at www.embl.de/services/core_facilities/pepcore/members/index.php?s_personId=4403. As described, we heat the gel in the microwave oven for about 10 sec so it's getting hot without boiling. I guess it's about 70-80C. As you may know, you should not heat a gel in the microwave if you want to do mass spec. afterwards as you will decrease the efficiency of extraction of protein bands from the gel. Additionally, the sensitivity of this fast method is lower than for some Coomassie protocols optimized for high sensitivity so it may not be ideal for very low protein amounts (<10 ng). Best regards
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Hi,
Thank you for this method. However, I would like to know is there some special procedure when using this method with Protein Agarose gel electrophoresis? I tried with Agarose gel but it appears the entire gel is stained permanently blue. Have you tried this method with agarose gel or modified it for such purpose?
Thank you.
Posted by: Dominic AgyeiSeptember 28, 2011, 8:48 AM
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Hi,
we haven't tried this with agarose gels, but I'm sure you need to do some modification of the procedure. The most important one would be avoiding the microwave step for washing and staining. This would obviously damage the agarose gel. As far as I know the destaining of agarose gels can take much longer compared to poly-acrylamide gels. Not sure if due to larger pore size thus more dye inside the gel or higher affinity of the dye to agarose due to more polar structure of agarose, maybe both. I hope that helps.
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Hi,
I just want to say how I'm thankful because of sharing this very wonderful fast method by this site. It helped me to have more clear gels and to save the time.
Thank you again!
Hanie
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It seems the protocol is simple and easy. I will try. If I want to make just 100mL of staining solution, I would take 6mg dye, 100mL water and 0.3mL HCL. Does this work?
Posted by: Kiranmayee. PFebruary 13, 2012, 12:34 AM
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Hi,
I can say, It works, especially when your protein concentration on gel lanes is high enough (according to my own experience). Give it a try!
Be lucky
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We are using this method but have encountered an occasional glitch... our gels are blue with negative (transparent) bands where the protein should be.... We are considering the possibility that this is the result of insufficient washing prior to staining, but this is not consistent with the gel that you have shown (which was not washed enough).
This is very clear and easy way of staining the gels. I would like to know the consequences of using acetic acid and organic solvents in staining the proteins electrophoresd using polyacrylamide gels, or what was is this method advantageous than the traditional coomassie staining using acetic acid and methanol ?
your replies are appreciated
regards,
Rajesh
1
ReplyPosted by: AnonymousAugust 17, 2009, 2:23 AM