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Further, the complex with dihydroheme d1 allowed us to probe the importance of specific residues in the vicinity of the ligand binding site, revealing residues not required for binding or stability of NirF but essential for denitrification in experiments with complemented mutants of a ΔnirF strain of P. aeruginosa. Together, these data suggest that NirF possesses a yet unknown enzymatic activity and is not simply a binding protein of heme d1 derivatives. DATABASE Structural data are available in PDB database under the accession