![SMOBIO/[PM2600] ExcelBand™ 3-color High Range Protein Marker (9-245 kDa), 250 μl x 2/9-245 kDa), 250 μl x 2</span>
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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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A.优点：
多重分析——一次分析可以检测16种干细胞相关的TF
定量比较——二个样本的差异可以定量分析和比较
步骤简单——探针温育、柱分离、板杂交和HRP检测
无需贵重仪器——无需如Luminex那样的贵重仪器
B.原理：
干细胞转录因子活性多重检测阵列试剂用于同时检测多种TF活性。该技术中，基于TFDNA结合位点的一致性序列，制备一系列生物素标记的探针。当探针混合物与核提取物一起温育时，每个探针寻找相应的TF，形成TF/探针复合物，通过柱离心纯化可以很容易与游离探针分开。结合的探针从混合物中分离出来，通过板杂交分析。板孔中预包被上与探针互补的特异序列，捕获的DNA探针进一步用链酶亲和素-HRP检测，化学发光检测仪测定发光强度（RLUs）。
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.
我的邮箱：maoyuanqing@citiz.net
样品处理：
a. 植物组织：取新鲜或-70℃冻存100mg组织在液氮中研磨，把粉末加入到1ml裂解液中混匀。
b. 动物组织：取新鲜或-70℃冻存100mg组织加1ml裂解液，用组织研磨杵或匀浆器匀浆处理。
c. 贴壁细胞：直接在培养板中加入裂解液裂解细胞，每106细胞加1ml 裂解液。用取样器吹打混匀。
d. 细胞悬液：离心收集细胞。每106动物、植物和酵母细胞或每107细菌细胞加1ml裂解液混匀。
e. 血液处理：取0.2-1ml新鲜血液加3倍体积红细胞裂解液，混匀后室温放置10分钟，10000rpm离心1分钟。弃上清，若沉淀含有红细胞，可加入2倍体积红细胞裂解液重复裂解步骤。离心后沉淀加入1 ml裂解液混匀。
将处理后的样品在室温放置5分钟，使得核酸蛋白复合物完全分离。
向匀浆样品中加0.2ml氯仿，盖好管盖，剧烈振荡15秒，室温放置3-5分钟。
2-8℃ 12000 rpm离心10分钟。RNA主要在上层无色的水相中，把水相转移到新管中，不要吸到沉淀。
吸附柱前处理：在吸附柱中加入500ul 洗柱液，室温放置2分钟，2-8℃ 12,000 rpm离心2min，弃废液。6. 第4步收集的上清中加入200ul无水乙醇混匀，加入吸附柱静置2分钟，2-8℃ 12000rpm离心2min，弃废液。7. 向吸附柱中加入600ul漂洗液(使用前请先检查是否已加入无水乙醇)，2-8℃ 12,000 rpm离心2min，弃废液。8. 向吸附柱中加入600ul漂洗液，2-8℃ 12,000 rpm离心2min，弃废液。9. 12000rpm离心2min，弃掉收集管，将吸附柱置于室温放置数分钟将吸附柱中残余的漂洗液去除。10. 将吸附柱放入新管中，向膜中央滴加50-100ul RNase free ddH2O，室温放置5min，12000rpm室温离心2min即得到RNA。
注意事项：
所有相关器皿耗材都应为RNase-free产品，操作过程要小心，带口罩、手套避免环境中RNA酶污染样品。
RNA在水溶液中OD值可能在1.5-1.9之间，但这并不表示RNA不纯，需电泳检测。
【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）
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
(1)1×107细胞重悬,其来源可为新鲜样品或贮存于-80℃1mol冰冻清洗缓冲液中
的无DMSO的样品,冰冻缓冲液包括10mMHEPES(pH7.5),1.5mMMgCl2,10mMKCl,
1mM二硫苏糖醇(DTT),然后离心(16000rpm、4℃、1min)。
(2)重悬细胞团于100ul冰冻裂解缓冲液,其包含10mMTris-HCl(pH7.5),1mMMgCl2,1mMEGTA,0.1mM苯甲基磺酰氟(DMSF),5mMB2巯基乙醇,0.5%CHAPs(Pierce)和10%甘油。
(3)冰育30分,然后在超速离心机中离心30分钟。
(4)去上清,液氮速冻沉淀,裂解细胞于-80℃保存。
二、扩增
(1)在微量管中冻干0.1ug荧光标记的cx反转引物,蜡封(5′CCCTTACCCTTACCC
TTACCCTTA3′)。
(2)于蜡界之上加50ulTRAP反应物,包括Tris-Cl(pH8.3)20mM,1.5mMMgCl2,
63mMKCl,0.005%,TWeen20,1mMEGTA,50mM三磷酸脱氧核苷,0.1ug荧光标记
TS前导引物(5′AATCCGTCGAGCAGAGTT3′),1ugT4基因32蛋白,牛血清白蛋白0.1mg/ml,2UTaqNDA聚合酶(Takara,shyzou)和5ugCHAPs细胞提取液。荧光标记TS引物可由市场购得。扩增前5ug提取物与1ugRNA酶37℃水浴20分钟,为了端粒酶活性的标准化,运用体内端粒酶活性标准(TTAS):TS重叠引物和CX重叠引物(TS:5′AATCCGTCGAGCAGAGTTGTGAATGAGGCCTTC3′及CX:5′CCCTTACCCTTACCCTTACCCTTATAGGCGCTCAATGTA3′)TS(18bp)和CX(24bp)序列为普通型,下划线标出的为成肌素序列(每个15bp)。成肌素CDNA通过这些引物扩
增产生了150bp的产物,它可用与ITAS扩增端粒酶梯度相同的TS引物和CX引物进行
再扩增。每一项测定用25attogram以显现I-TAS,它并不干扰TRAP测量。
(3)置于22℃10分钟,作为TS引物由端粒酶介导的延伸。90℃热灭活反应物90秒。
(4)PCR扩增,条件94℃30S,50℃30S,72℃1.5min;共27循环。
三、分析
(1)制备8%的变性胶(longRanger,ATBiochem)含6M尿素。
(2)加电泳缓冲液(1×TBE)于电泳槽。
(3)上样缓冲液与产物各1ul混合后上样,上样缓冲液含90%甲酰胺和10%蓝葡聚
糖(Bluedertian)。
(4)95℃预发性4分钟,速冷,上样,运用100bp,150bp,200bp大小荧光标记物。
(5)测序
(6)测序结果由FiagmuntManager程序自动分析,每一荧光峰根据大小、高度、面积定
量。因为过量扩增的产物会产生不可信的面积值,一部分PCR产物应在蒸馏水稀释后再分析
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
