Involved in the biosynthesis of pulcherrimin, a red extracellular pigment. Catalyzes the oxidation of cyclo(L-Leu-L-Leu) (cLL) to yield pulcherriminic acid which forms pulcherrimin via a nonenzymic reaction with Fe(3+). Substrates with small alkyl groups (cAA, cLG, cLP) exhibit weaker binding to CYP134A1, but substrates with larger hydrophobic side chains bind in a similar regime to cLL. cyclo(L-leucyl-L-leucyl) + 4 H(+) + 3 O2 + 6 reduced [2Fe-2S]-[ferredoxin] = 4 H2O + 6 oxidized [2Fe-2S]-[ferredoxin] + pulcherriminic acid Homodimer. Belongs to the cytochrome P450 family.