| 别名 ABCB2、Antigen peptide transporter 1、APT1 + [14] | 
| 简介 ABC transporter associated with antigen processing. In complex with TAP2 mediates unidirectional translocation of peptide antigens from cytosol to endoplasmic reticulum (ER) for loading onto MHC class I (MHCI) molecules (PubMed:25377891, PubMed:25656091). Uses the chemical energy of ATP to export peptides against the concentration gradient (PubMed:25377891). During the transport cycle alternates between 'inward-facing' state with peptide binding site facing the cytosol to 'outward-facing' state with peptide binding site facing the ER lumen. Peptide antigen binding to ATP-loaded TAP1-TAP2 induces a switch to hydrolysis-competent 'outward-facing' conformation ready for peptide loading onto nascent MHCI molecules. Subsequently ATP hydrolysis resets the transporter to the 'inward facing' state for a new cycle (PubMed:11274390, PubMed:25377891, PubMed:25656091). Typically transports intracellular peptide antigens of 8 to 13 amino acids that arise from cytosolic proteolysis via IFNG-induced immunoproteasome. Binds peptides with free N- and C-termini, the first three and the C-terminal residues being critical. Preferentially selects peptides having a highly hydrophobic residue at position 3 and hydrophobic or charged residues at the C-terminal anchor. Proline at position 2 has the most destabilizing effect (PubMed:11274390, PubMed:7500034, PubMed:9256420). As a component of the peptide loading complex (PLC), acts as a molecular scaffold essential for peptide-MHCI assembly and antigen presentation (PubMed:1538751, PubMed:25377891, PubMed:26611325). | 
| 靶点 | 
| 作用机制 TAP1基因刺激剂 | 
| 原研机构 | 
| 非在研适应症- | 
| 最高研发阶段临床2期 | 
| 首次获批国家/地区- | 
| 首次获批日期1800-01-20 | 
| 作用机制 HLA class I抗原刺激剂 [+1]  | 
| 在研适应症 | 
| 非在研适应症- | 
| 最高研发阶段临床前 | 
| 首次获批国家/地区- | 
| 首次获批日期1800-01-20 | 
| 开始日期2020-02-20 | 
| 申办/合作机构 | 
