I cannot get beta-actin, other proteins is ok. I tried several actin antibodies, none works. I am thinking maybe semi-dry transfer too long, but 11-40KD marker still there. Whats happened?
You mean you cannot detect beta-actin by WB on your membrane?
【在 E*****1 的大作中提到】 : I cannot get beta-actin, other proteins is ok. : I tried several actin antibodies, none works. : I am thinking maybe semi-dry transfer too long, but 11-40KD marker still : there. : Whats happened?
【在 E*****1 的大作中提到】 : I cannot get beta-actin, other proteins is ok. : I tried several actin antibodies, none works. : I am thinking maybe semi-dry transfer too long, but 11-40KD marker still : there. : Whats happened?
E*1
14 楼
regular protein, I got it before But I cannot get it now WB reagnet? What is that?
thanks. Dear I think I use this one too but I cannot get ....55555
【在 i***l 的大作中提到】 : try this:Sigma no. A2066 works well for me
s*y
16 楼
WB reagent, 比方说你的二抗 (这个是最可能出问题的), 或者chemifluorescent reagents, buffer (check your PBS or TBS buffer pH) Sodium Azide (did you mistakenly put sodium azide in your buffer anywhere?)
【在 E*****1 的大作中提到】 : regular protein, I got it before : But I cannot get it now : WB reagnet? What is that?
E*1
17 楼
But why I can get others except actin
【在 s******y 的大作中提到】 : WB reagent, : 比方说你的二抗 (这个是最可能出问题的), : 或者chemifluorescent reagents, : buffer (check your PBS or TBS buffer pH) : Sodium Azide (did you mistakenly put sodium azide in your buffer anywhere?)
s*y
18 楼
你是说其他带都能显出来,就是actin 看不见?
【在 E*****1 的大作中提到】 : But why I can get others except actin
The possibilty of gel: Impossible, I tried gel from both pre-made of biorad and home-made neither works I checked TBS, PH is 7.6, a little bit high but not that high I doubt maybe protein penetrate through PVDF membrane but like sunnyday said "即使转膜不完全,不可能一点都看不到的" It is so werid!
g*5
27 楼
Recently I used actin antibody (sigma) to probe mouse heart sample. no band observed. and actin can't recognize mouse muscle samples, too.
【在 g*********5 的大作中提到】 : Recently I used actin antibody (sigma) to probe mouse heart sample. no band : observed. : and actin can't recognize mouse muscle samples, too.
Thanks for all of you.It really gave me some hints. I was just thinking if i did not put sodium azide, The 1st antibody in BSA is easy to go bad. I want to keep for while to use it (one or two or three month). so I did that Also my previous lab all did the same. Never happened this problem before. Thanks again. You all are really nice
【在 E*****1 的大作中提到】 : Thanks for all of you.It really gave me some hints. : I was just thinking if i did not put sodium azide, The 1st antibody in BSA : is easy to go bad. I want to keep for while to use it (one or two or three : month). so I did that : Also my previous lab all did the same. Never happened this problem before. : Thanks again. You all are really nice
l*1
39 楼
LZ can try PD training within suunyday lab a good mentor in WB plus xxx, Sure.
【在 E*****1 的大作中提到】 : Thanks for all of you.It really gave me some hints. : I was just thinking if i did not put sodium azide, The 1st antibody in BSA : is easy to go bad. I want to keep for while to use it (one or two or three : month). so I did that : Also my previous lab all did the same. Never happened this problem before. : Thanks again. You all are really nice
prep new sample start over again may be the fastest way i hate trouble shooting
【在 E*****1 的大作中提到】 : Try new BSA without any sodium azmide, still not work!!
b*s
47 楼
Ab is less likely to go wrong if you can have signals from other probings. your sample prep might be the target of troubleshooting. 1) did you freeze and thaw your sample frequently? - if yes, your current samples are no longer reliable. make aliquotes in the future, or boil protein right after lysis. 2) must snap freeze and thaw on ice for all ampules 3) double check your lysis process and use new protein samples - microtubules can be very hard to dissolve or remain soluble
【在 E*****1 的大作中提到】 : Try new BSA without any sodium azmide, still not work!!
s*8
48 楼
My WB has a lot, lot, lot.... of problems with different kinds of antibody. 我的问题是忽好忽坏的, 有的时候连p53也不出. 看了你的回帖, 我 有几个问题, sample in SDS loading dye 开始就煮好的, 用的 好好的,然后下次在煮, 跑胶, 就不出信号了, 虽然我染了膜, 挺好的条带。 多 久能重复用这个sample哪?
【在 b****s 的大作中提到】 : Ab is less likely to go wrong if you can have signals from other probings. : your sample prep might be the target of troubleshooting. : 1) did you freeze and thaw your sample frequently? - if yes, your current : samples are no longer reliable. make aliquotes in the future, or boil : protein right after lysis. : 2) must snap freeze and thaw on ice for all ampules : 3) double check your lysis process and use new protein samples - : microtubules can be very hard to dissolve or remain soluble
b*s
49 楼
once proteins were brewed in SDS-PAGE buffer with DTT or bME, they can be stored at -20C and no need to be boiled again. personally i prefer boiling samples freshly prior to gel loading.. my samples can be stable for 1-2 months with several freeze-thaw cycles.
.
【在 s******8 的大作中提到】 : My WB has a lot, lot, lot.... of problems with different kinds of antibody. : 我的问题是忽好忽坏的, 有的时候连p53也不出. : 看了你的回帖, 我 有几个问题, sample in SDS loading dye 开始就煮好的, 用的 : 好好的,然后下次在煮, 跑胶, 就不出信号了, 虽然我染了膜, 挺好的条带。 多 : 久能重复用这个sample哪?
b*s
50 楼
查查看你用的抗体的说明书。有可能你用的beta-actin只识别单一种属,譬如人。
【在 E*****1 的大作中提到】 : I cannot get beta-actin, other proteins is ok. : I tried several actin antibodies, none works. : I am thinking maybe semi-dry transfer too long, but 11-40KD marker still : there. : Whats happened?
z*a
51 楼
pic pic show the pic of your WB
E*1
52 楼
I think something with membrane? I bought pre-made membrane all the moluclar weight around 43-20 KD is nothing, But I can get tubulin Another question, except actin and GAPDH what else I can use for control?
s*y
53 楼
Tubulin is good as internal control as well. We sometimes also use vinculin It is possible your membrane has problem and didn't retain the small proteins.
【在 E*****1 的大作中提到】 : I think something with membrane? : I bought pre-made membrane all the moluclar weight around 43-20 KD is : nothing, But I can get tubulin : Another question, except actin and GAPDH : what else I can use for control?
E*1
54 楼
Yes. But we r doing some cytoskeleton molecular, so I do not want to use tublin as interbal control
【在 s******y 的大作中提到】 : Tubulin is good as internal control as well. : We sometimes also use vinculin : It is possible your membrane has problem and didn't retain the small : proteins.
s*y
55 楼
You can use vinculin too
【在 E*****1 的大作中提到】 : Yes. : But we r doing some cytoskeleton molecular, : so I do not want to use tublin as interbal control
E*1
56 楼
we do not have that antibody This is my film:
【在 s******y 的大作中提到】 : You can use vinculin too
E*1
57 楼
hi can you see my attachment?
s*y
58 楼
既然你怀疑是膜的问题,何不找另外一个实验室借一小点膜来重新转一次你的 蛋白?干嘛要和自己过不去啊?
【在 E*****1 的大作中提到】 : we do not have that antibody : This is my film:
M*e
59 楼
我有类似的经历:检测不到一个ATCC cell line 的 beta-actin。 Cell line: SW780 (human urothelial carcinoma). I bought this cell line twice from ATCC, but I could not detect beta-actin at all. The expression of beta-actin as shown by Western blot in this cell line was reported in the literature. I could detect GAPDH in this cell line. I could use the same beta-actin antibody (Sigma) to detect beta-actin in other human cell lines (urothelial and non-urothelial carcinoma) using the same antibody (Sigma). I don't think that one of steps of the whole WB process (including antibodies, buffer, membrane, transfer, samples, etc) went wrong. I still don't know why I couldn't detect beta-actin in this cell line, but I didn't bother to figure it out.
E*1
60 楼
All the low molecular cannot be seen in my membrane, what happened?? I borrowed th new membrane
T*r
61 楼
Try nitrocellulose membrane o.2um other than o.45um thickness Try to reduce your transfer time