Fig. 3

Alignment of NR AA sequences from higher plants, green algae and brown algae. Black arrows indicate the beginning and end of each functional domain: Mo-pterin for molybdopterin binding domain, Heme for heme binding domain, FAD for FAD binding domain, NADH for NADH binding domain. Asterisks below sequences denote AAs that had been identified as key invariant residues in AtNR from Arabidopsis thaliana [5]. Red arrows indicate the first AA for SjNR-L and SjNR-S. The six sequences aligned were NRs from A. thaliana (AAA32830.1), Nicotiana tabacum (XP_016462202.1), Ulva prolifera (ASV49153.1), Chlamydomonas reinhardtii (XP_001696697), and Ectocarpus siliculosus (CBN78746.1), as well as SjNR-L from S. japonica (UXG49833.1)