EOG8284GR GO:0046872 22/79 metal ion binding molecular_function "Interacting selectively and non-covalently with any metal ion." [GOC:ai] EOG8284GR GO:0004655 22/79 porphobilinogen synthase activity molecular_function "Catalysis of the reaction: 2 5-aminolevulinate = 2 H(2)O + H(+) + porphobilinogen." [EC:4.2.1.24, RHEA:24067] EOG8284GR GO:0006779 19/79 porphyrin-containing compound biosynthetic process biological_process "The chemical reactions and pathways resulting in the formation of any member of a large group of derivatives or analogs of porphyrin. Porphyrin consists of a ring of four pyrrole nuclei linked each to the next at their alpha positions through a methine group." [GOC:jl, ISBN:0198506732] EOG8284GR GO:0033014 3/79 tetrapyrrole biosynthetic process biological_process "The chemical reactions and pathways leading to the formation of tetrapyrroles, natural pigments containing four pyrrole rings joined by one-carbon units linking position 2 of one pyrrole ring to position 5 of the next." [CHEBI:26932, GOC:mah]