BacteriumArchaeaNitrite ReductaseDecarboxylationOxidativePropionateConvertHeme SynthesisFe-coproporphyrinLosssirohemeTransformationEntityAndRelationshipHemeDidecarboxysirohemeBiosynthesis PathwayModified TetrapyrroleInvolveto GiveD1 Heme Synthesisside chainsAcetic AcidOxygenSulfiteSulfateChlorophyllHemeSirohemeVitamin B12ReducingSynthesissirohemepropionatepropionate side chaindecarboxylationside chaind1hemetetrapyrrolesmodified tetrapyrrolesconstruction of the central molecular framework of modified tetrapyrroleslife pigmentessential biological functionwide range of essential biological functionheme d1molecular hijack