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Does biotinylated proteins will migrate diferently in an SDS than the actual pro


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#1 medchemgirl

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Posted 12 November 2009 - 07:44 AM

If I wanted to detect a protein that normally would be 9kDa as a monomer, and I got it biotinylated, would it be detected in a WB at a different molecular weight using Streptavidin-HRP for detection? And how much more heavier would it be?

#2 Gerard

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Posted 12 November 2009 - 08:26 AM

MW biotin 244g, your protein MW 9000g

You can,t tell the difference in the blot
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#3 medchemgirl

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Posted 12 November 2009 - 08:29 AM

Ohh, I see, so I shouldn't worry about it then.

MW biotin 244g, your protein MW 9000g

You can,t tell the difference in the blot



#4 mdfenko

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Posted 13 November 2009 - 11:32 AM

it may be relatively insignificant if there is only one biotin bound per protein molecule but if more biotin binds then the effect will become more significant.

also, which page formulation do you use? if you are using tris-tricine then one biotin may make a significant difference on the gel.
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#5 Feelcontraire

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Posted 18 November 2009 - 05:09 PM

If I wanted to detect a protein that normally would be 9kDa as a monomer, and I got it biotinylated, would it be detected in a WB at a different molecular weight using Streptavidin-HRP for detection? And how much more heavier would it be?



You may observe differences higher than expected as biotin is a vitamin that may lead to a different ratio of weight/mobility than that of aminoacids. This is due to it's conductivity, hydrophobicity and SDS interacting characteristics.

#6 medchemgirl

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Posted 19 November 2009 - 11:06 AM

I was actually just reading about the Tris-Tricine gels. I have never used them. I am using Nupage Bis-Tris gel from Invitrogen.

it may be relatively insignificant if there is only one biotin bound per protein molecule but if more biotin binds then the effect will become more significant.

also, which page formulation do you use? if you are using tris-tricine then one biotin may make a significant difference on the gel.



#7 Feelcontraire

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Posted 19 November 2009 - 04:47 PM

I was actually just reading about the Tris-Tricine gels. I have never used them. I am using Nupage Bis-Tris gel from Invitrogen.

it may be relatively insignificant if there is only one biotin bound per protein molecule but if more biotin binds then the effect will become more significant.

also, which page formulation do you use? if you are using tris-tricine then one biotin may make a significant difference on the gel.



You can use your Nupage Bis-Tris gels with MES instead of MOPS or HEPES which will give a similar result as tricine.

Search for MES monohydrate it's much cheaper than just MES.

#8 medchemgirl

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Posted 02 December 2009 - 02:31 PM

That is what I'm using actually, but the MES, not the monohydrate. I will check that. Thanks

I was actually just reading about the Tris-Tricine gels. I have never used them. I am using Nupage Bis-Tris gel from Invitrogen.

it may be relatively insignificant if there is only one biotin bound per protein molecule but if more biotin binds then the effect will become more significant.

also, which page formulation do you use? if you are using tris-tricine then one biotin may make a significant difference on the gel.



You can use your Nupage Bis-Tris gels with MES instead of MOPS or HEPES which will give a similar result as tricine.

Search for MES monohydrate it's much cheaper than just MES.






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