Interestingly. Depending on how they interaction relies on DNA. BTw, how did you get this conclusion? they did not have any physical association in pulldown assay?
To go further, you need to first confirn your current findings in different ways. Some suggestions: 1. Do GST pulldown, to make sure there is little or no direct interaction between them in vitro; 2. consider if the addition of DNase, which is also a protein, will directly interfere with the physical association between these two proteins. In other words, if DNase reduces the physical association only via chromatin/ DNA degradation but not other ways. if you confirm that these two proteins are physically associated via chromatin, then you will need to think about continuing this project. the following are a number of examples: 1. One, or both of these two proteins, are transcripotion factors? if yes, what is the binding sequence and where? 2. does they form ternary complex on one of the DNA bind elements? 3. Knockdown one of transcription factor will reduce DNA binding of the other?
非常感谢你的指导: 两个蛋白都不是transcription factor,但是其中一个有报道可以识别sequence specific DNA motif by a zinc finger protein。敲除之后,能看到另一个蛋白DNA binding显著增高了。 chromatin fraction IP显示两个蛋白是在chromatin上相互作用。有没有相关的文献推 荐几篇给我? 我找了挺久的,都没找着。 Ternary complex 不知道怎么检测?
1. 两个蛋白都不是transcription factor,但是其中一个有报道可以识别sequence specific DNA motif by a zinc finger protein。 Do you mean it recognizes DNA motif by a zinc finger domain? 2. 敲除之后,能看到另一个蛋白DNA binding显著增高了。 taken 1&2, it suggests that 1) the other protein is also able to bind DNA, 2 ) the presence of the protein mentioned in "1" inhibited the DNA binding of the other protein. 3. chromatin fraction IP显示两个蛋白是在chromatin上相互作用。 Regular ChIP does not tell you that these proteins interact on chromatin; it only tells that both proteins bind to the same or similar region of chromatin; 4. Ternary complex 不知道怎么检测? EMSA can be used to test ternary complex formation. Based on these results, I believe that you do not have a strong argument that these two proteins physically interact relying on chromatin. You need more compelling data.
非常感谢你的建议! 是的,两个组独立做出来的。 3. chromatin fraction IP显示两个蛋白是在chromatin上相互作用。 Regular ChIP does not tell you that these proteins interact on chromatin; it only tells that both proteins bind to the same or similar region of chromatin; 我是isolate细胞的chromatin组分做的IP。如果证据不充分的话,是不是必须要做 Sunnday建议的体外reconstitution的实验才可以?