PSAE-1 (PSA E1 KNOCKOUT); catalytic. Identical to Photosystem I reaction center subunit IV A, chloroplast precursor (PSAE1) [Arabidopsis Thaliana] (GB:Q9S831); similar to PSAE-2 (photosystem I subunit E-2), catalytic [Arabidopsis thaliana] (TAIR:AT2G20260.1); similar to AT4G28750 [Arabidopsis lyrata subsp. petraea] (GB:AAT72503.1); contains InterPro domain Electron transport accessory protein; (InterPro:IPR008990); contains InterPro domain Photosystem I reaction centre subunit IV/PsaE; (InterPro:IPR003375)