pfam09049: SNN_transmemb (490087 is an unknown moldel)
Stannin transmembrane
Members of this family consist of a single highly hydrophobic transmembrane helix that transverses the lipid bilayer at a 20 degree angle with respect to the membrane normal. They contain a conserved cysteine residue (Cys32) that, together with Cys34 found in the stannin unstructured linker domain, constitutes the putative trimethyltin-binding site that resides at the end of the transmembrane domain close to the lipid/solvent interface.
Jiyao W et al.(2023). "The conserved domain database in 2023.",