%0 Journal Article %A Poole Robert, K. %A Baines Baldev, S. %A Curtis Sally, J. %A Williams Huw, D. %A Wood Paul, M. %T Haemoprotein b-590 (Escherichia coli); Redesignation of a Bacterial ‘Cytochrome a1’ %D 1984 %J Microbiology, %V 130 %N 11 %P 3055-3058 %@ 1465-2080 %R https://doi.org/10.1099/00221287-130-11-3055 %I Microbiology Society, %X A ‘soluble’ fraction from anaerobically grown Escherichia coli contains a haemoprotein with spectral properties, notably an α-band in the reduced form at 585 to 595 nm, similar to cytochrome a 1. Haem extraction of either the soluble preparation or whole cells yields haem b, but not haem a. In view of this, and the spectral similarities of the a 1-like component to well-known high-spin haem b proteins, we propose that the name ‘haemoprotein b-590’ be used to describe this substance and that consideration be given to the applicability of the name to certain other cytochrome a 1-like pigments in bacteria. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-130-11-3055