Fig. 1. Morphology and growth of TbIMPDH crystals in living insect cells.
a Differential interference contrast (DIC) image of Sf9 cells 6 days p. i. with recombinant baculovirus containing the gene for TbIMPDH. Needle-shaped crystals, mostly extending the cell-body, are clearly visible. The arrowhead points to a vertical crystal, indicating the rectangular shape of the needles. b Transmission electron micrograph of a cross section of two TbIMPDH crystals within the cytoplasm of a Sf9 cell 6 days p. i. showing a clear crystal lattice with large water channels. C TbIMPDH crystal, CP cytoplasm, ER endoplasmic reticulum, N nucleus, NM nuclear membrane, P10 baculoviral P10 protein aggregate, PM plasma membrane, VP - viral particles. c Modulation contrast image of Sf9 cells showing multiple TbIMPDH crystals 7 days p. i., located within living cells and free in the surrounding medium (arrowhead). d Growth of a TbIMPDH crystal at 5 days p. i. in Sf9 cells taking place over the course of several hours. The crystal grows simultaneously in two dimensions. See also Supplementary Movie 1.