title: Cloning, expression and characterization of human kininogen domain 3.
abstract: The internal domain 3 of the heavy chain of human kininogen, a cysteine proteinase inhibitor, was amplified by a polymerase chain reaction from the kininogen cDNA clone phKG36. The DNA fragment was expressed in Escherichia coli using the ompA expression vector pASK40 and the resulting protein was isolated from periplasm, purified by S-carboxymethylpapain affinity- and ion-exchange chromatography. The recombinant human kininogen domain 3 is 92% pure, reacts with anti-kininogen antibodies and is actively inhibitory. The expected amino acid sequence of ANSM-[G253-S377] kininogen was confirmed; the inhibitor has a molecular mass of 14,396 Da and an isoelectric point of 6.0 (pH). The determined Ki values of the complexes with papain and cathepsin L are similar to those measured previously with proteolytically liberated kininogen domain 3, and those of single-domain cystatins, like chicken egg white cystatin. However, recombinant kininogen domain 3 is a weak inhibitor of cathepsin B (Ki = 63 nM) as it has been found for native L-kininogen (Ki = 340 nM).
authors: Abteilung für Klinische Chemie und Klinische Biochemie, Ludwig Maximilians Universität München, Germany.
authors: E A
authors: EA
authors: Auerswald
authors: D
authors: D
authors: Rössler
authors: R
authors: R
authors: Mentele
authors: I
authors: I
authors: Assfalg-Machleidt
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D015853:Cysteine Proteinase Inhibitors / Q000737:chemistry / Q000235:genetics; D015870:Gene Expression; D006801:Humans; D007704:Kininogens / Q000235:genetics*; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides / Q000737:chemistry; D012333:RNA, Messenger / Q000235:genetics; D011994:Recombinant Proteins / Q000235:genetics
chemical_list: D015853:Cysteine Proteinase Inhibitors; D007704:Kininogens; D009838:Oligodeoxyribonucleotides; D012333:RNA, Messenger; D011994:Recombinant Proteins