This family of domains are likely to bind to zinc ions. They contain many conserved cysteine and histidine residues. We have named this domain after the N-terminal motif CXHY. This domain can be found in isolation in some proteins, but is also often associated with Pfam:PF00097. One of the proteins in this family (Swiss:P36078) is a mitochondrial intermembrane space protein called Hot13. This protein is involved in the assembly of small TIM complexes [1].

1: The role of Hot13p and redox chemistry in the mitochondrial TIM22 import pathway. Curran SP, Leuenberger D, Leverich EP, Hwang DK, Beverly KN, Koehler CM; J Biol Chem 2004;279:43744-43751. PMID:15294910

2: Molecular basis of Pirh2-mediated p53 ubiquitylation. Sheng Y, Laister RC, Lemak A, Wu B, Tai E, Duan S, Lukin J, Sunnerhagen M, Srisailam S, Karra M, Benchimol S, Arrowsmith CH; Nat Struct Mol Biol. 2008;15:1334-1342. PMID:19043414