A loop between transmembrane helices IX and X of subunit I of cytochrome c oxidase caps the heme a-heme a3-CuB center.
Hosler JP, Shapleigh JP, Tecklenburg MJ, Thomas JW, Kim Y, Espe M, Fetter J, Babcock GT, Alben JO, Gennis RB, et al.
Hosler JP, et al.
Biochemistry. 1994 Feb 8;33(5):1194-201. doi: 10.1021/bi00171a019.
Biochemistry. 1994.
PMID: 8110750
Consistent with our recent model in which both hemes are ligated to histidines of helix X [Hosler, J. P., et al. (1993) J. Bioenerg. Biomembr. 25, 121-136], substitutions for three of these four residues cause perturbations of either heme a or heme a3. ...
Consistent with our recent model in which both hemes are ligated to histidines of helix X [Hosler, J. P., et al. (1993) J …