Required for production of prodigiosin antibiotic (Pig); overproduction in ygfX, sdhE or double sdhE-ygfX deletion mutants leads to nearly 10-fold increased synthesis of Pig (PubMed:22474332, PubMed:23657679). Overexpressing cells have somewhat altered cell length depending on growth phase (PubMed:23657679). Does not function as a toxin; overexpression in the presence or absence of sdhE (the putative antitoxin) has no effect on growth rate (PubMed:23657679). Antibiotic biosynthesis; prodigiosin biosynthesis. Interacts with itself, SdhE and as in E.coli FtsZ and MreB; other interactions are shown but require validation (PubMed:23657679). Transcribed under both aerobic (with succinate or glucose) and anaerobic (with glycerol with or without fumarate) conditions (PubMed:24374335). Part of the sdhE-ygfX operon (PubMed:22474332). The intact transmembrane domain is required for Pig production, its replacement with 2 TMs from an E.coli membrane protein (MalF) does not allow Pig synthesis; although the chimeric protein is found in the membrane it does not self-associate. No effect on aerobic growth on succinate or in LB. 90% decreased synthesis of prodigiosin antibiotic, decreased transcription of flavoprotein desaturase PigA (PubMed:22474332, PubMed:23657679). Truncated N-terminus.