Looked up the condition on C6 (https://c6.csiro.au/C6.asp) and that condition 
is found in both Index and JCSG screens as well as Classics II.


Bevan Marshall
Staff Scientist | Collaborative Crystallisation Centre
Manufacturing
CSIRO
E bevan.marsh...@csiro.au<mailto:bevan.marsh...@csiro.au>T +61 3 9662 7492
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From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of LEGRAND 
Pierre
Sent: Thursday, 28 March 2019 9:13 AM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Interesting pattern on a crystallization drop

Dear Beatriz,

Nice drops :-))
Could it be that there is a reaction going on in these drops ?
The conditions are quite "exotic" with possibilities of coordination or 
oxydoreduction (Co2+/Co3+) or polymerization...
Do you have reductants with the protein buffer ?
Is the protein an enzyme or a metalloprotein ?
Just some ideas.

Best wishes,
Pierre

________________________________
De : CCP4 bulletin board [CCP4BB@JISCMAIL.AC.UK] de la part de Beatriz Gomes 
Guimaraes [beatriz.guimar...@fiocruz.br]
Envoyé : mercredi 27 mars 2019 19:44
À : CCP4BB@JISCMAIL.AC.UK<mailto:CCP4BB@JISCMAIL.AC.UK>
Objet : [ccp4bb] Interesting pattern on a crystallization drop

Dear all,



I would like to share with you a surprising pattern I found when examining some 
crystallization plates (attached figures).



It is less obvious looking the photos, but apparently the "lines" are formed by 
precipitated protein and there are some "bubbles" with small drops inside. I 
wish they were microcrystals but I do not think this is the case.

I was suprised by the symmetry !



And it is not completely random because for the same condition the difference 
between the two drops are : protein alone ("hexagon") and protein + ligand 
("rhombus")


crystallization condition is:

0.01 M Cobalt(II) chloride hexahydrate

0.1 M Tris pH 8.5

20% w/v Polyvinylpyrrolidone K 15



Have you seen anything similar before?



Thank you for your comments!

Beatriz




--------------------------
Beatriz Guimarães
Laboratory of Structural Biology and Protein Engineering
Instituto Carlos Chagas - ICC / FIOCRUZ Paraná
Rua Prof. Algacyr Munhoz Mader, 3775   Bloco C
CIC 81350-010
Curitiba - PR, Brasil
Tel.:+55(41)3316-3225/2104-3438

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