FUNCTION: As part of the heme biosynthetic pathway, catalyzes the sequential polymerization of four molecules of porphobilinogen to form hydroxymethylbilane, also known as preuroporphyrinogen (PubMed:18936296, PubMed:19138865, PubMed:23815679). Catalysis begins with the assembly of the dipyrromethan...
                        FUNCTION: As part of the heme biosynthetic pathway, catalyzes the sequential polymerization of four molecules of porphobilinogen to form hydroxymethylbilane, also known as preuroporphyrinogen (PubMed:18936296, PubMed:19138865, PubMed:23815679). Catalysis begins with the assembly of the dipyrromethane cofactor by the apoenzyme from two molecules of porphobilinogen or from preuroporphyrinogen. The covalently linked cofactor acts as a primer, around which the tetrapyrrole product is assembled. In the last step of catalysis, the product, preuroporphyrinogen, is released, leaving the cofactor bound to the holodeaminase intact (PubMed:18936296). {ECO:0000269|PubMed:18936296, ECO:0000269|PubMed:19138865, ECO:0000269|PubMed:23815679}.
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                        GO - Biological processes (BP): 
                        heme biosynthetic process [GO:0006783]; peptidyl-pyrromethane cofactor linkage [GO:0018160]; protoporphyrinogen IX biosynthetic process [GO:0006782]...
                        heme biosynthetic process [GO:0006783]; peptidyl-pyrromethane cofactor linkage [GO:0018160]; protoporphyrinogen IX biosynthetic process [GO:0006782]
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                        GO - Molecular function (MF): 
                        hydroxymethylbilane synthase activity [GO:0004418]...
                        hydroxymethylbilane synthase activity [GO:0004418]
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                        GO - Cellular component (CC): 
                        cytoplasm [GO:0005737]; cytosol [GO:0005829]...
                        cytoplasm [GO:0005737]; cytosol [GO:0005829]
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