Hemopexin is a heme-binding protein that transports heme to the liver. Hemopexin-like repeats occur in vitronectin and some matrix metallopeptidases family (matrixins). The HX repeats of some matrixins bind tissue inhibitor of metallopeptidases (TIMPs).

1: The helping hand of collagenase-3 (MMP-13): 2.7 A crystal structure of its C-terminal haemopexin-like domain. Gomis-Ruth FX, Gohlke U, Betz M, Knauper V, Murphy G, Lopez-Otin C, Bode W J Mol Biol 1996;264:556-566. PMID:8969305