Thioredoxin-like protein HCF164, chloroplastic is involved in maintaining cell redox homeostasis. The portein displayes disulfide reductase activity that is involved in the biogenesis of the plastid cytochrome b6f complex. Protein is located in the thylakoid membrane with the C-terminal hydrophilic portion, containing the thioredoxin like domain, extending into the thylakoid lumen.