>3D_helix;109
            protein_name:BtuCD ABC transporter, BtuC subunit (Escherichia coli)
            file_name:ABC-transporter_BtuC.txt
            entry_date:6Aug02
            refman_number:20289
            endnote_number:
            author:Locher,K.P., Lee,A.T., Rees,D.C. (2002) [The E. coli BtuCD structure:  A framework for ABC transporter architecture and mechanism] {Science, 296, 1091-1098}
            remarks:TM helix G does not cross the membrane completely. It ends in an extended stretch packed between several other helices. Functional protein has 2 BtuC subunits (membrane spanning) & 2 BtuD subunits. Not all TM segments are fully helical. Sequence from Swiss-Prot. TMhelices=10.
            pir_number:B90931
            Swiss_Prot_entry:BTUC_ECO57
            Swiss_Prot_number:Q8X4L7
            Swiss_Prot_gene:BTUC,Z2740,ECS2418
            Swiss_Prot_name:Vitamin B12 transport system permease protein btuC
            PDB_title:bacterial ABC transporter involved in B12 uptake
            PDB_Identifier:1L7V
            N_terminal:in
            number_tmsegs:10
            tm_segments:A.2,32;B.47,81;C.93,107;D.114,138;E.142,166;F.191,206;G.229,249;H.258,267;I.272,296;J.305,324
            sequence:MLTLARQQQRQNIRWLLCLSVLMLLALLLSLCAGEQWISPGDWFSPRGELFVWQIRLPRTLAVLLVGAALAISGAVMQALFENPLAEPGLLGVSNGAGVGLIAAVLLGQGQLPNWALGLCAIAGALIITLILLRFARRHLSTSRLLLAGVALGIICSALMTWAIYFSTSVDLRQLMYWMMGGFGGVDWRQSWLMLALIPMLLWICCQSRPMNMLALGEISARQLGLPLWFWRNVLVAATGWMVGVSVALAGAIGFIGLVIPHILRLCGLTDHRALLPGCALAGASALLLADIVARLALAAAELPIGVVTATLGAPVFIWLLLKAGR*