Figure 5: Prdx4 oxidizes Cys residues within the GDE2 GDPD domain.

(a,b,d,e) Western blots of biotin labelling assays to measure thiol oxidation. (c–e) Graph quantifying biotin incorporation normalized to total GDE2, GDE2C340S or GDE2C467S. Mean±s.e.m., n=8–13 different transfection experiments. Compared with GFP (green fluorescent protein) controls, (c) Prdx4 *P=0.0159, Prdx4C118.239S P=0.6955; (d) Prdx4 P=0.3022, Prdx4C118.239S P=0.0854; (e) Prdx4 P=0.9249, Prdx4C118.239S P=0.4988, two-tailed Student’s t-test. (f) Sequence of the GDE2 GDPD domain located between transmembrane (TM) regions 5 and 6. Sequences in yellow denote peptides identified by mass spectrometry; C340 and C467 are shown in red.