F*K
2 楼
最近表达纯化一个65kd的蛋白,GST tag,但主带总是在25kd, 应该是GST本身。
载体测序验证无误,目的基因前没有终止子,请问是什么原因导致融合蛋白断裂?
谢谢。
载体测序验证无误,目的基因前没有终止子,请问是什么原因导致融合蛋白断裂?
谢谢。
H*g
8 楼
Sorry have to type in English.
Do you have antibody targeted to your fusion protein?
Do you have antibody targeted to your fusion protein?
b*y
9 楼
If you still see some full length product, put a His tag at the C-terminus.
Using Ni first and then glutathione sepharose next. You will produce some
good stuff. Due to dimeric nature of GST, it is still not ideal.
If you can, make a MBP-YPI-His. Using Ni first and Amylose second, you will
get pure protein. And the yield can be enhanced as well.
Good luck!
Using Ni first and then glutathione sepharose next. You will produce some
good stuff. Due to dimeric nature of GST, it is still not ideal.
If you can, make a MBP-YPI-His. Using Ni first and Amylose second, you will
get pure protein. And the yield can be enhanced as well.
Good luck!
H*g
10 楼
Does Maltose Binding Protein tag also have the dimerization issue?
In his case, I guess he needs to determine whether his protein really got
expressed or not, before considering any possibility of degradation, etc.
.
will
【在 b******y 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: If you still see some full length product, put a His tag at the C-terminus.
: Using Ni first and then glutathione sepharose next. You will produce some
: good stuff. Due to dimeric nature of GST, it is still not ideal.
: If you can, make a MBP-YPI-His. Using Ni first and Amylose second, you will
: get pure protein. And the yield can be enhanced as well.
: Good luck!
In his case, I guess he needs to determine whether his protein really got
expressed or not, before considering any possibility of degradation, etc.
.
will
【在 b******y 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: If you still see some full length product, put a His tag at the C-terminus.
: Using Ni first and then glutathione sepharose next. You will produce some
: good stuff. Due to dimeric nature of GST, it is still not ideal.
: If you can, make a MBP-YPI-His. Using Ni first and Amylose second, you will
: get pure protein. And the yield can be enhanced as well.
: Good luck!
b*y
11 楼
No, MBP is largely a monomer.
He said "主带总是在25kd". I am guessing that there are minor bands and one
of them is the full length product. If no full length product at all due to
degradation, it is hard to help out here.
He said "主带总是在25kd". I am guessing that there are minor bands and one
of them is the full length product. If no full length product at all due to
degradation, it is hard to help out here.
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