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. 2014 Oct 27;9(10):e110643. doi: 10.1371/journal.pone.0110643

Table 1. Absorption maximum and pKa value of wild-type and various GR mutants.

Opsin type GR WT GR D121N GR E132D GR E132Q
λmax (nm) pH 4: 549 pH 4: 558 pH 4: 550 pH 4: 561
pH 7: 544 pH 7: 560 pH 7: 544 pH 7: 550
pH 9: 543 pH 9: 563 pH 9: 540 pH 9: 540
pKa 5.9 6.0 5.4 4.2
9.2 11.0 6.1 7.2