A surfactin-related region to look closer at.
The public N4 genome has a predicted biosynthetic region with a surfactin reference match. It includes srfAA, annotated as a surfactin peptide synthetase. Follow that evidence to choose a candidate for a fermentation screen.
1. What this genome supports
Region 1.2 spans 370,452–435,840 bp on NZ_CP095736.1 and has a surfactin reference match. Within it, srfAA is annotated as a surfactin non-ribosomal peptide synthetase at 390,452–401,215 bp. The retained map also contains two neighboring srfAB entries. I would inspect their separate annotations and underlying sequence rather than assume they represent one intact gene.
2. What published research adds
Cosmina et al. (1993) characterized the srfA operon and its surfactin synthetase subunits in B. subtilis. Roggiani & Dubnau (1993) showed that ComA binds the srfA promoter, with stronger binding after phosphorylation. These studies supply functional and regulatory context; they do not establish the integrity, expression, or activity of the corresponding genes in N4.
3. How I would follow the evidence
First, inspect srfAA and its neighbors on the map, check the retained sequence, and compare the region with the MIBiG surfactin reference. Treat the two srfAB entries as a question to resolve. Then use a controlled fermentation screen to investigate surface activity and confirm the compound’s identity experimentally. Keep gene integrity, regulation, and measured production as separate evidence questions.