登録情報 データベース : PDB / ID : 8yr4 構造の表示 ダウンロードとリンクタイトル Cryo-EM structure of the human ABCB6 in complex with Cd(II):Phytochelatin 2 要素ATP-binding cassette sub-family B member 6 Phytochelatin 2 詳細キーワード MEMBRANE PROTEIN / Cryo-EM / ABC transporter / ATP-binding cassette transporter B6 / ABCB6 / heme biosynthesis / heavy metal detoxification / glutathione / phytochelatin機能・相同性 機能・相同性情報分子機能 ドメイン・相同性 構成要素
Defective ABCB6 causes MCOPCB7 / cellular detoxification of cadmium ion / Mitochondrial ABC transporters / tetrapyrrole metabolic process / ABC-type heme transporter / porphyrin-containing compound metabolic process / tetrapyrrole binding / heme metabolic process / porphyrin-containing compound biosynthetic process / heme transport ... Defective ABCB6 causes MCOPCB7 / cellular detoxification of cadmium ion / Mitochondrial ABC transporters / tetrapyrrole metabolic process / ABC-type heme transporter / porphyrin-containing compound metabolic process / tetrapyrrole binding / heme metabolic process / porphyrin-containing compound biosynthetic process / heme transport / melanosome assembly / ABC-type heme transporter activity / heme transmembrane transport / melanosome membrane / multivesicular body membrane / mitochondrial envelope / endolysosome membrane / vacuolar membrane / skin development / efflux transmembrane transporter activity / intracellular copper ion homeostasis / ABC-type transporter activity / ATP-binding cassette (ABC) transporter complex / brain development / transmembrane transport / early endosome membrane / mitochondrial outer membrane / intracellular iron ion homeostasis / endosome / Golgi membrane / lysosomal membrane / heme binding / endoplasmic reticulum membrane / endoplasmic reticulum / Golgi apparatus / ATP hydrolysis activity / mitochondrion / extracellular exosome / nucleoplasm / ATP binding / plasma membrane / cytosol 類似検索 - 分子機能 Mitochondrial ABC-transporter, N-terminal five TM domain / Mitochondrial ABC-transporter N-terminal five TM region / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter ... Mitochondrial ABC-transporter, N-terminal five TM domain / Mitochondrial ABC-transporter N-terminal five TM region / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性 : / ATP-binding cassette sub-family B member 6 類似検索 - 構成要素生物種 Homo sapiens (ヒト)Tracheophyta (植物)手法 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度 : 3.1 Å 詳細データ登録者 Choi, S.H. / Lee, S.S. / Lee, H.Y. / Kim, S. / Kim, J.W. / Jin, M.S. 資金援助 韓国, 3件 詳細 詳細を隠す組織 認可番号 国 National Research Foundation (NRF, Korea) NRF-2019M3E5D6063908 韓国 National Research Foundation (NRF, Korea) NRF-2021M3A9I4022846 韓国 National Research Foundation (NRF, Korea) NRF-2022R1A2C1091278 韓国
引用ジャーナル : Commun Biol / 年 : 2024タイトル : Cryo-EM structure of cadmium-bound human ABCB6.著者 : Seung Hun Choi / Sang Soo Lee / Hyeon You Lee / Subin Kim / Ji Won Kim / Mi Sun Jin / 要旨 : ATP-binding cassette transporter B6 (ABCB6), a protein essential for heme biosynthesis in mitochondria, also functions as a heavy metal efflux pump. Here, we present cryo-electron microscopy ... ATP-binding cassette transporter B6 (ABCB6), a protein essential for heme biosynthesis in mitochondria, also functions as a heavy metal efflux pump. Here, we present cryo-electron microscopy structures of human ABCB6 bound to a cadmium Cd(II) ion in the presence of antioxidant thiol peptides glutathione (GSH) and phytochelatin 2 (PC2) at resolutions of 3.2 and 3.1 Å, respectively. The overall folding of the two structures resembles the inward-facing apo state but with less separation between the two halves of the transporter. Two GSH molecules are symmetrically bound to the Cd(II) ion in a bent conformation, with the central cysteine protruding towards the metal. The N-terminal glutamate and C-terminal glycine of GSH do not directly interact with Cd(II) but contribute to neutralizing positive charges of the binding cavity by forming hydrogen bonds and van der Waals interactions with nearby residues. In the presence of PC2, Cd(II) binding to ABCB6 is similar to that observed with GSH, except that two cysteine residues of each PC2 molecule participate in Cd(II) coordination to form a tetrathiolate. Structural comparison of human ABCB6 and its homologous Atm-type transporters indicate that their distinct substrate specificity might be attributed to variations in the capping residues situated at the top of the substrate-binding cavity. 履歴 登録 2024年3月20日 登録サイト : PDBJ / 処理サイト : PDBJ改定 1.0 2024年6月19日 Provider : repository / タイプ : Initial release改定 2.0 2024年9月25日 Group : Advisory / Atomic model ... Advisory / Atomic model / Data collection / Database references / Derived calculations / Polymer sequence / Source and taxonomy / Structure summary カテゴリ : atom_site / em_admin ... atom_site / em_admin / em_entity_assembly / entity / entity_poly / entity_poly_seq / pdbx_entity_nonpoly / pdbx_entity_src_syn / pdbx_nonpoly_scheme / pdbx_poly_seq_scheme / pdbx_struct_conn_angle / pdbx_unobs_or_zero_occ_residues / struct_asym / struct_conn / struct_mon_prot_cis / struct_ref / struct_ref_seq Item : _atom_site.label_entity_id / _atom_site.label_seq_id ... _atom_site.label_entity_id / _atom_site.label_seq_id / _em_admin.last_update / _em_entity_assembly.entity_id_list / _pdbx_entity_nonpoly.entity_id / _pdbx_nonpoly_scheme.entity_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _struct_asym.entity_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_label_seq_id / _struct_mon_prot_cis.label_seq_id / _struct_mon_prot_cis.pdbx_label_seq_id_2 / _struct_ref_seq.db_align_beg / _struct_ref_seq.db_align_end / _struct_ref_seq.pdbx_auth_seq_align_beg / _struct_ref_seq.pdbx_auth_seq_align_end / _struct_ref_seq.ref_id / _struct_ref_seq.seq_align_end 改定 3.0 2024年11月6日 Group : Advisory / Atomic model ... Advisory / Atomic model / Data collection / Database references / Derived calculations / Polymer sequence / Structure summary カテゴリ : atom_site / em_admin ... atom_site / em_admin / em_entity_assembly / entity / entity_poly / pdbx_entity_nonpoly / pdbx_entry_details / pdbx_modification_feature / pdbx_nonpoly_scheme / pdbx_poly_seq_scheme / pdbx_struct_assembly / pdbx_struct_assembly_gen / pdbx_struct_conn_angle / pdbx_unobs_or_zero_occ_atoms / pdbx_unobs_or_zero_occ_residues / struct_asym / struct_conn / struct_mon_prot_cis / struct_ref_seq Item : _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ... _atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_asym_id / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.group_PDB / _atom_site.label_asym_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.label_entity_id / _atom_site.label_seq_id / _atom_site.type_symbol / _em_admin.last_update / _em_entity_assembly.entity_id_list / _entity_poly.pdbx_strand_id / _pdbx_entry_details.has_protein_modification / _pdbx_struct_assembly.oligomeric_count / _pdbx_struct_assembly.oligomeric_details / _pdbx_struct_assembly_gen.asym_id_list / _pdbx_struct_conn_angle.ptnr1_auth_asym_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_asym_id / _pdbx_struct_conn_angle.ptnr2_auth_asym_id / _pdbx_struct_conn_angle.ptnr2_auth_seq_id / _pdbx_struct_conn_angle.ptnr2_label_asym_id / _pdbx_struct_conn_angle.ptnr3_auth_asym_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_asym_id / _struct_mon_prot_cis.auth_asym_id / _struct_mon_prot_cis.auth_seq_id / _struct_mon_prot_cis.label_asym_id / _struct_mon_prot_cis.pdbx_auth_asym_id_2 / _struct_mon_prot_cis.pdbx_auth_seq_id_2 / _struct_mon_prot_cis.pdbx_label_asym_id_2