I ran the sequence of that unknown ORF through some protein domain prediction algorithms.
Here a pore is predicted from residues 80-133, and top GO terms are for ion channel, nucleotide/side binding, and catalytic activity:
bioinf.cs.ucl.ac.uk/psi…
Then FUpred predicts a 7-domain protein:
seq2fun.dcmb.med.umich.…
Those links should stay good for a couple days at least.