>3D_helix;122
            protein_name:MthK K+ channel* (Methanobacterium thermoautotrophicum)
            file_name:MthK.txt
            entry_date:17July02
            refman_number:20342
            endnote_number:
            author:Jiang,Y.X., Lee,A., Chen,J.Y., Cadene,M., Chait,B.T., MacKinnon,R. (2002) [Crystal structure and mechanism of a calcium-gated potassium channel] {Nature, 417, 515-522}
            remarks:*The 'tmsegs' marked below include the so-called pore-helix (P) associated with the pore region. 'tmseg' B corresponds to P. Sequence from Swiss-Prot. TMhelices=2.
            pir_number:H69069
            Swiss_Prot_entry:MTHK_METTH
            Swiss_Prot_number:O27564
            Swiss_Prot_gene:MTHK,MTH1520
            Swiss_Prot_name:Calcium-gated potassium channel MthK
            PDB_title:Potassium channel related protein
            PDB_Identifier:1LNQ
            N_terminal:in
            number_tmsegs:3
            tm_segments:A.19,40;B.49,57;C.72,95
            sequence:MVLVIEIIRKHLPRVLKVPATRILLLVLAVIIYGTAGFHFIEGESWTVSLYWTFVTIATVGYGDSPSTPLGMYFTVTLIVLGIGTFAVAVERLLEFLINREQMKLMGLIDVAKSRHVVICGWSESTLECLRELRGSEVFVLAEDENVRKKVLRSGANFVHGDPTRVSDLEKANVRGARAVIVDLESDSETIHCILGIRKIDESVRIIAEAERYENIEQLRMAGADQVISPFVISGRLMSRSIDDGYEAMFVQDVLAEESTRRMVEVPIPEGSKLEGVSVLDADIHDVTGVIIIGVGRGDELIIDPPRDYSFRAGDIILGIGKPEEIERLKNYISA*