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Hi Liuqing, 1) When you say 8Å diffraction - did you test the crystals at room temperature? 2) Change the construct. Trim loops and termini, (re)move tags, etc. HTH, Dave ________________________________ From: CCP4 bulletin board <[log in to unmask]> on behalf of Liuqing Chen <[log in to unmask]> Sent: 04 June 2018 11:57:58 To: [log in to unmask] Subject: [ccp4bb] suggestion of crystallization optimization Hello everyone! I get a crystal several months ago, but the crystals diffraction very low resolution (around 8A) or no diffraction. My sample buffer is 20mm Hepes ph7.0, 50mm NaCl, my protein pI is 5. the codition grow crytal is : 30% PEG400, 100mm hepes 7.5, 200mm MgCl2. I also tried additive screen, all the crystals appear the same apparence, even i seeding optimization, have no improve. the attach is my crystals. what should i do next? thanks in advance. sincerely Liuqing chen ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1 The Francis Crick Institute Limited is a registered charity in England and Wales no. 1140062 and a company registered in England and Wales no. 06885462, with its registered office at 1 Midland Road London NW1 1AT ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1