Re: [ccp4bb] Crystals with DNA

2024-02-11 Thread Guillaume Gaullier
Hello Careina, In addition to all the good suggestions you already got, I can point to these very good references: - Pryor EE Jr, Wozniak DJ & Hollis T (2012) Crystallization of Pseudomonas aeruginosa AmrZ protein: development of a comprehensive method for obtaining and optimization of protein

Re: [ccp4bb] Crystals with DNA

2024-02-09 Thread Patrick Shaw Stewart
Carina, to complement the techniques using sticky ends, etc., you can also use the "random" microseeding approach that I mentioned to Kavya, see below. The great advantage in a project like yours, where you have a family of related constructs, is that you can use cross-seeding - that is, you can u

Re: [ccp4bb] Crystals with DNA

2024-02-09 Thread Fred Vellieux
Hello, Overhanging "sticky" ends are mentioned frequently when it comes to obtaining infinite helices that are useful in crystallization. For example in https://home.ccr.cancer.gov/csb/nihxray/Tips-and-Tricks_Crystallization_Protein-DNA_updated.pdf . Cheers, Fred. On 09/02/2024 10:59, car

Re: [ccp4bb] Crystals with DNA

2024-02-09 Thread Nicolas Foos
Hello, If you want to promote "infinite" helix, you should go for overhangs (sticky end)  with compatible sequence. I try to explain better what I have in mind (and I actually did). example : 5'ATCCCTAAATCGGCGTGTGCT---3' 3'---GGATTTAGCCGCACACGATAG5' Hoping that this results in something li

Re: [ccp4bb] Crystals with DNA

2024-02-09 Thread careinaedgo...@yahoo.com
Thank you for this insight, Nicolas. It is very helpful.Yes I have also had a soccer ball shaped crystal that does not diffract as well as, and more recently, many plate like crystals but they do not diffract either.I do know I have both protein and DNA in my crystals but I do not know, as you s

Re: [ccp4bb] Crystals with DNA

2024-02-08 Thread Nicolas Foos
Hello Careina, In my hands, DNA protein complex crystals may be frustrating, because often we get good looking crystals which don't diffract at all and are actually not easy to improve. I remember obtaining a lot of crystal looking a bit like "STOP" road sign (octogonal shape for one axis) w

[ccp4bb] RES: [ccp4bb] Crystals with DNA

2024-02-08 Thread Rafael Marques
Assunto: [ccp4bb] Crystals with DNA Hello all. I am struggling to get defracting crystals with a protein DNA complex. The crystals are plentiful but they do not diffract. I am going back to the grind stone and relookong at my DNA sequence. Is there any wisdom you could give me with regards to what

[ccp4bb] Crystals with DNA

2024-02-08 Thread careinaedgo...@yahoo.com
 Hello all. I am struggling to get defracting crystals with a protein DNA complex. The crystals are plentiful but they do not diffract. I am going back to the grind stone and relookong at my DNA sequence.Is there any wisdom you could give me with regards to what works best with DNA in crystals?F