NRPS involved in extracellular coprogen-type siderophores biosynthesis (PubMed:17056706). The role of extracellular siderophores in fungal virulence to plants is to supply iron to the fungus during plant infection, but not to act as phytotoxins, depriving their hosts of iron (PubMed:17056706). Siderophore biosynthesis. Expression is up-regulated under iron depletion (PubMed:17056706). NRP synthetases are composed of discrete domains (adenylation (A), thiolation (T) or peptidyl carrier protein (PCP) and condensation (C) domains) which when grouped together are referred to as a single module (By similarity). Each module is responsible for the recognition (via the A domain) and incorporation of a single amino acid into the growing peptide product (By similarity). Thus, an NRP synthetase is generally composed of one or more modules and can terminate in a thioesterase domain (TE) that releases the newly synthesized peptide from the enzyme (By similarity). Occasionally, methyltransferase domains (responsible for amino acid methylation) are present within the NRP synthetase (By similarity). NPS6 contains a degenerate A domain (dA) in the second module and has the following architecture: A-T-C-dA-T-T-C (PubMed:17056706). Leads to increased sensitivity to oxidative stress and raduces the virulence toward Arabidopsis thaliana plants (PubMed:17056706). Belongs to the NRP synthetase family.