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Hi Jacob,

check out Figure 1 in

Natively inhibited Trypanosoma brucei cathepsin B structure determined by using an X-ray laser.
Redecke L, et al.
Science. 2013 Jan 11;339(6116):227-30.

and 

In vivo protein crystallization opens new routes in structural biology.
Koopmann R. Nature Methods. 2012 Jan 29;9(3):259-62.

best
Savvas 




On 15 Feb 2013, at 20:44, Jacob Keller wrote:

Dear Crystallographers,

I was looking at some live, control HEK cells expressing just eGFP, and to my great surprise, saw littered across the dish what appeared to be small fluorescent needles (see attached--sorry about the size, but it's only ~1MB total.) Can these possibly be fortuitous protein crystals? They were too small to mount I think, and for what it's worth, parallel-transfected HeLa cells did not have these things. But, some needles could be seen in the DIC images as well, and the needles were only fluorescent with GFP filter sets, and not CFP, YFP, or texas red filters. I thought of whale myoglobin crystallizing on the decks of ships, but never thought I would see this....

Jacob

-- 
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Jacob Pearson Keller, PhD
Postdoctoral Associate
HHMI Janelia Farms Research Campus
email: [log in to unmask]
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<GFP_crystals_DIC.png><GFP_crystals_Fluorescence.png>