3.4.21.B12 | by vapor diffusion in hanging drops. K4 crystallised in the presence of 10 mM Ni2+ reveals tetragonal space group P4. In the presence of Zn2+ it reveals tetragonal space group P41212. In the presence of 10 mM Co2+ it reveals monoclinic space group P21. The three different K4 crystal forms with bound Ni2+, Zn2, and Co2+ contain two, four and 16 crystallographically independent K4 molecules per asymmetric unit, respectively. K4 possesses an unusual 99-loop that creates a groove-like acidic S2 subsite |
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