binding protein binding GO:0005515 GO:0045308 Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules). Reactome:REACT_100287 Reactome:REACT_101129 Reactome:REACT_102084 Reactome:REACT_102457 Reactome:REACT_103972 Reactome:REACT_104029 Reactome:REACT_104599 Reactome:REACT_105776 Reactome:REACT_105895 Reactome:REACT_106168 Reactome:REACT_106189 Reactome:REACT_107402 Reactome:REACT_108283 Reactome:REACT_109392 Reactome:REACT_110419 Reactome:REACT_110570 Reactome:REACT_15321 Reactome:REACT_15325 Reactome:REACT_15355 Reactome:REACT_15417 Reactome:REACT_15419 Reactome:REACT_15506 Reactome:REACT_15541 Reactome:REACT_20509 Reactome:REACT_20539 Reactome:REACT_28794 Reactome:REACT_30571 Reactome:REACT_30672 Reactome:REACT_31305 Reactome:REACT_31537 Reactome:REACT_31641 Reactome:REACT_31648 Reactome:REACT_32973 Reactome:REACT_33135 Reactome:REACT_34719 Reactome:REACT_6923 Reactome:REACT_6945 Reactome:REACT_78382 Reactome:REACT_78466 Reactome:REACT_79634 Reactome:REACT_80470 Reactome:REACT_80778 Reactome:REACT_83147 Reactome:REACT_83165 Reactome:REACT_83532 Reactome:REACT_85250 Reactome:REACT_85858 Reactome:REACT_85975 Reactome:REACT_87187 Reactome:REACT_87374 Reactome:REACT_87652 Reactome:REACT_88068 Reactome:REACT_88138 Reactome:REACT_88223 Reactome:REACT_89261 Reactome:REACT_90027 Reactome:REACT_90105 Reactome:REACT_90666 Reactome:REACT_91560 Reactome:REACT_92029 Reactome:REACT_93175 Reactome:REACT_93938 Reactome:REACT_94522 Reactome:REACT_94808 Reactome:REACT_95241 Reactome:REACT_95561 Reactome:REACT_95647 Reactome:REACT_96236 Reactome:REACT_96264 Reactome:REACT_98028 Reactome:REACT_98807 alpha-2 macroglobulin receptor-associated protein activity molecular_function protein amino acid binding protein degradation tagging activity protein folding chaperone protein tagging activity