title: De-novo cloning of FKBP23 cDNA from pig ER using nested PCR.
abstract: FK506 binding proteins (FKBPs) in cells are known as immunophilins. We have identified and characterized a cDNA encoding an endoplasmic reticulum (ER) immunophilin, FKBP23, from pig liver by nested PCR. The predicted amino acid sequence of pig FKBP23 shows high identity to those of human FKBP23 and mouse FKBP23. It possesses a conserved FKBP-type peptidylprolyl cis-trans isomerase (PPIase) domain and EF-hand domain. We constructed a plasmid to express pFKBP23. Furthermore, we proved that the recombinant pFKBP23 can specifically bind to natural BiP, the main protein of the molecular chaperone Hsp70 in ER lumen; the binding is interrelated with the Ca2+ concentration just as the FKBP23 from mice.
authors.affiliation: Biochemical Section of Key Laboratory of Functional Polymer Materials, The Ministry of Education of China, Institute of Polymer Chemistry, Chemical School of Nankai University, 300071 Tianjin, P. R. China.
authors.forename: Ruifang
authors.initials: R
authors.lastname: Han
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Chen
authors.initials: C
authors.lastname: Chen
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Zhao
authors.forename: Huaifeng
authors.initials: H
authors.lastname: Mi
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002135:Calcium-Binding Proteins / Q000737:chemistry / Q000235:genetics*; D003001:Cloning, Molecular; D004721:Endoplasmic Reticulum / Q000502:physiology*; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction / Q000379:methods; D013552:Swine; D022021:Tacrolimus Binding Proteins / Q000737:chemistry / Q000235:genetics*
chemical_list: D002135:Calcium-Binding Proteins; C116295:Fkbp7 protein, mouse; C074856:FKBP3 protein, human; D022021:Tacrolimus Binding Proteins