Description
The PM2600 ExcelBand™ 3-color High Range Protein Marker is a ready-to-use three-color protein standard with 12 pre-stained proteins covering a wide range of molecular weights from 10 to 245 kDa in Tris-Glycine Buffer (9 to 235 kDa in Bis-Tris (MOPS) buffer and 10 to 235 kDa in Bis-Tris (MES) buffer). Proteins are covalently coupled with a blue chromophore except for two reference bands (one green and one red band at 25 kDa and 75 kDa respectively) when separated on SDS-PAGE (Tris-Glycine buffer). The PM2600 3-color Pre-Stained Protein Marker is designed for monitoring protein separation during SDS-polyacrylamide gel electrophoresis, verification of Western transfer efficiency on membranes (PVDF, nylon, or nitrocellulose) and for approximating the size of proteins.
Features
Ready-to-use — Premixed with a loading buffer for direct loading, no need to boil.
Two reference bands — 75 kDa (red) and 25 kDa (green)
Contents
Approximately 0.1~0.4 mg/ml of each protein in the buffer (20 mM Tris-phosphate (pH 7.5), 2% SDS, 0.2 mM DTT, 3.6 M urea, and 15% (v/v) glycerol).
Quality Control
Under suggested conditions, PM2600 ExcelBand™ 3-color High Range Protein Marker resolves 12 major bands in 15% SDS-PAGE (Tris-Glycine buffer) and after Western blotting to nitrocellulose membrane.
Storage
4°C for 3 months-20°C for 24 months
Specification
Cat. No. | PM2600 |
Series Name | ExcelBand™ |
Product Size | 2 x 250 μl |
MW Range | 10 – 245 kDa |
Band Number | 12 |
Band Color | Red/Green/Blue |
Markered Bands | 25, 75 kDa |
Manual
Manual_PM2600_ExcelBand™ 3-color High Range Protein Marker
SDS
SDS_PM2600
Migration patterns and approximate MWs (kDa)
Why are there contrasting results in molecular weights after using different brands of protein markers?
A.Different proteins even with similar molecular weights would exhibit apparent disparity from the resulting SDS PAGE due to the difference in the composition of the protein’s amino acids (e.g. gelatin). The reason for the disparity is due to the amino acids composition that affects the binding of the protein and SDS. Therefore, we can say that protein marker is a handy tool to estimate molecular weight, but there is no absolute molecular weight standard.
B.While running SDS-PAGE, protein mobility can be affected by the composition of the buffer used, gel percentage, the voltage used, running time, as well as if there is a pre-run.
C.Another recommendation for high molecular weight proteins is to prolong the running time to clarify the relative location of bands.
Protein marker Retention Period: Mentioned -20°C and over 2 years. Is it available for 30 months or 36 months? Have you tested this period?
Yes, we have tested our PM2700. The results showed that the PM2700 is stable at -20℃ for at least two years. It has also shown strong performance for more than 36 months under our careful storage. However, we must only suggest a 2 year retention period for the following reasons: There may be a variation in the environment in storage, and improper use may lead to accumulated damage to the proteins and therefore reduce its retention period.
How many times of freezing and thawing are available for protein markers? If it uses 5 μL per load, would the total usage quantity be 50 times x 2 (250 μL x 2 tube)?
Yes, 100 uses (5 μL each time) can be expected if freezing and thawing are conducted carefully and properly at the appropriate temperature. Before each use, make sure the protein marker is thoroughly thawed.
Do you have data comparison for protein molecular weight’s precision with other protein markers?
Yes. Usually, pre-stained marker is written on “estimated molecular weight” for caution. It is known that the analysis of protein size by an SDS-PAGE is only for “estimation” because of the intrinsic variation of amino acid composition in all proteins including stained and non-stained ones. For example, a protein which is highly hydrophilic might show a particular higher position in the SDS-PAGE analysis when compared to a hydrophobic one. We did compare the migration patterns of SMOBIO’s Protein Markers with other brands, and we concluded that it was difficult to define “precision” due to the reasons mentioned above. Therefore, in the product description, we suggest our users to calibrate the MW against their interested proteins. Although it is impossible to define "precision" for molecular weight of proteins in SDS-PAGE, we did compare the migration pattern of pre-stained markers with unstained protein marker (Invitrogen MARK12) for calibration. It is concluded that the estimated molecular weight of SMOBIO’s pre-stained marker shows a curve matching well with that of unstained native proteins (MARK12), representing a good estimation of the MW of each pre-stained protein in the SDS-PAGE analysis.
Will SMOBIO’s Protein Markers/Ladder be washed out during Western blotting process?
SMOBIO’s Protein Markers/Ladder will be only slightly washed out during Western blotting process. However, the excess of Tween-20 (more than 0.2%) in washing buffer will affect SMOBIO’s Protein Markers/Ladder on the transfer membrane.
Here are suggestions for Western blotting process:1. Transfer SMOBIO’s Protein Markers/Ladder to membrane with transfer buffer containing 20% methanol to fix SMOBIO’s Protein Markers/Ladder on membrane. 2. Wash membrane with PBS or TBS containing less than 0.1% Tween-20.
Will SMOBIO’s Protein Markers/Ladder be affected by the stripping/deprobing process with the presence of β-Mercaptoethanol (β-ME)?
In normal circumstances, the presence of βME during the stripping/deprobing process will only slightly affect SMOBIO’s Protein Markers/Ladder. However, the presence of Tween-20 on PVDF membrane during the stripping/deprobing process has adverse effects on SMOBIO’s Protein Markers/Ladder.
Here are suggestions for Western stripping/deprobing process:
1. Wash the PVDF membrane in methanol for 5~10 minutes prior to the stripping/deprobing process to mitigate the adverse effect of Tween-20.2. Recommended stripping buffer (for 1 L): 15 g glycine, 1 g SDS, 10 mL Tween 20. Dissolve in 800 mL distilled water. Adjust pH to 2.2 Bring volume up to 1 L with distilled waterUnraveling the novel effects of aroma from small molecules in preventing hen egg white lysozyme amyloid fibril formation
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ExcelBand™ Protein Markers
Ready-to-use— premixed with a loading buffer for direct loading, no need to boil
Broad range— 310 kDa to 5 kDa
Pre-stained bands — for monitoring protein separation during electrophoresis and Western blotting transferring efficiency on membrane
Enhanced bands— for quick reference
YesBlot™ Western Marker I
Ready-to-use — no need of mixing or heating before sample loading
Direct visualization — 10 IgG-binding proteins for direct visualization on Western blots
Pre-stained bands — 4 pre-stained proteins for monitoring protein separation during electrophoresis and Western blotting transferring efficiency on membrane
Wide range — 10 clear bands from 15 to 200 kDa for size estimation
Quick reference — two enhanced bands (30 and 80 kDa)
Q-PAGE™ Precast Gels
User-friendly gel cassette:
Numbered and framed wells for sample loading
Labeled warning sign and green tape as reminder
Enhanced gel performance:
Enhanced gel electrophoresis speed
Better band separation
Stable for shipping at ambient temperature
Easy compatibility:
Available as homogeneous and adjusted gradient gels for a wide range of protein separation.
Compatible with most popular protein electrophoresis systems
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用SDS裂解,RNA酶降解,
在过柱,后洗脱
不知单纯使用冰浴中超声裂解够了吗?还是说要选用裂解液呢?最主要的就是我不知道该怎么赔这个裂解液,使其COX活性不产生影响
【2】加入裂解液后可以加用超声破碎细胞。
【3】提完细胞的器具可以在显微镜下看一下,剩余的细胞还多不多。如果还多,说明细胞提取的不彻底,还要改进方法,争取提取的细胞彻底一些。
(仅供参考)
一、机械裂解法主要有以下两中:
1.热休克(Thermal shock),既反复冻溶法,是一种常用的机械裂解方式比,通常由冷冻和解冻两部分组成(freezing and thawing),.原理:由于细胞内冰粒形成和剩余细胞液的盐浓度增高引起溶胀,使细胞结构破碎.冷冻通常在液氮或-20°C冰上进行,解冻可以在37、50、65 或100℃水浴中进热休克比化学裂解温和,但是很有效,有资料表明用热休克和溶菌酶与SDS的方法获得了90%的细胞裂解率.
2.超声波处理(Ultrasonication)既利用超声加热的方法,把细胞破碎.但这种处理会导致DNA 的断裂,所以加热不宜过剧烈,要设定好超声时间和间隙时间,一般超声时间不超过5秒,间隙时间最好大于超声时间,这些都有利于保护酶的活性.bead-beating 也是常用的机械处理方式,有报道指出bead-beating 比热休克和化学裂解的细胞裂解效果更好 虽然DNA产量较高,但通常得到的DNA片段较小.
二、 化学裂解和酶裂解法(在提核酸时联合使用)
主要是裂解液处理法,细胞裂解液的主要目的有以下几种:(1)利用去污剂破坏脂质双分子层,破裂细胞;(2)溶解蛋白;(3)蛋白变性使其稳定;(4)抑制蛋白酶活性.
主要根据不同的目的,裂解液的组成有所不同,主要有提取核酸和蛋白两中.在提取RNA或DNA时,我们主要是要充分裂解细胞,得到更多的核酸;如果我们的目的是蛋白,那要根据蛋白的位置、特性等因素考虑裂解液,在提取蛋白后,再根据实验需要复性蛋白等.以下是细胞裂解中常用试剂和其作用:
50 mM Tris-HCl pH 7.4(缓冲体系),150 mM NaCl(等渗体系),1 mM PMSF (强大的蛋白酶抑制剂),1 mM EDTA(变性剂和稳定剂),5 μg/ml Aprotinin(蛋白酶抑制剂),5 μg/ml Leupeptin(蛋白酶抑制剂),1% Triton x-100(破坏细胞),1% Sodium deoxycholate(中度变性剂和蛋白溶解剂),0.1% SDS(强变性剂和蛋白溶解剂).7M 尿素,2M硫脲(可以提高膜蛋白的融解),蛋白酶K等.
1细胞用冷PBS洗两遍,离心,去除上清;
2加50~100ul三去污细胞裂解液;
3加PMSF,AP各1ul;
4用100ulTIp头吹打数次;
5置冰上15分钟
612000rpm,15min,4度
7取上清。这时,上清呈黏液状,用枪头吸时会将细胞碎片一起吸出。拉丝度很长,测蛋白浓度显示有,各位,这是怎么回事?做WB会影响结果吗?这种蛋白质在保存过程中会容易降解吗?
有的资料上显示第四步,不是用Tip头吹打,而是将EP管在桌上猛敲击几下,这个方法我也试过,但是结果蛋白浓度很低,没有出现上述现象,这是怎么回事呀?
裂解液裂解是一种比较温和的红细胞去除方法,主要用于经酶消化分散的组织细胞的分离纯化,淋巴细胞的分离纯化以及组织细胞蛋白与核酸提取等实验中红细胞的去除。经红细胞裂解液裂解得到的组织细胞中不含红细胞,可进一步用于原代培养、细胞融合、流式细胞分析、核酸与蛋白的分离和提取等。
这样可不可以?
另还有几个问题:1、这样的裂解液裂解线粒体提蛋白可不可以
2、裂解液加多少剂量
3、12000g离心10min和30分钟有没有区别
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**捷向您提供一站式的PARP相关实验解决方案,除了高通量PARP/凋亡分析试剂盒,还有PARP体内药理动力学二代分析试剂盒(PDAII)和通用PAPR分析试剂盒外(含组蛋白包被可拆卸板),以及相关抗体和重组蛋白。
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