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P460, an iron-containing chromophore at the active site of Hydroxylamine Oxidoreductase of the ammonia-oxidizing bacterium Nitrosomonas europaea, is a macrocycle of unknown structure with a Soret-like 460-nm absorption band in the ferrous form. The pigment can also be isolated in a peptide, "P460-Fragment". Resonance Raman spectroscopy (lambda ex = 457.9 nm) suggests that P460 is a new type of heme with symmetry properties lower than those of protophorphyrin IX or chlorins and similar to those of chlorophylls and isobacteriochlorins. Some of the resonance Raman vibrations of P460 are shifted in HAO as compared to those of P460-Fragment.
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