title: Some characteristics and purification of anti-(human ovarian carcinoma)xanti-(human CD3) single-chain bispecific antibody.
abstract: To obtain high-quality AhOC x AhCD3 [anti-(human ovarian carcinoma)xanti-(human CD3)] with high biological activity economically and easily, some characteristics and purification of AhOC x AhCD3, a single chain bispecific antibody, were investigated. During the present study, some important properties of AhOC x AhCD3, such as molecular mass, pI, solubility, stability, hydrophobic ability, molecular status and bioactivity were primarily studied. The molecular mass of AhOC x AhCD3 was determined to be approx. 58.0 kDa by SDS/PAGE (theoretical molecular mass: 56972.5 Da, calculated on the basis of the primary structure) and the pI was approx. 7.5+/-0.4 by IEF (isoelectric focusing; theoretical pI: 8.5, predicted by the ProtParam software tool) respectively. Experiments showed that the solubility of AhOC x AhCD3 increased with the pH increase and that the AhOC x AhCD3 was easily degraded into several fragments during the storage time of samples and the mixtures of both fragment B and fragment C retained normal bioactivity. Particularly, the soluble aggregate/polymer status of AhOC x AhCD3 with bioactivity was verified by non-reducing SDS/PAGE. After optimization of purification process, AhOC x AhCD3 with electrophoretic homogeneity was successfully obtained and the yield was approx. 20%. Some important properties of AhOC x AhCD3 were first observed and a procedure for soluble AhOC x AhCD3 purification in scale-up was first established. Some characteristics of AhOC x AhCD3, especially the stability of AhOC x AhCD3, are critical for the development of this protein pharmaceutical and useful for reference to other proteins.
authors.affiliation: State Key Laboratory of Bioreactor Engineering, Institute of New World Biotechnology, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhou
authors.forename: Dong-Zhi
authors.initials: DZ
authors.lastname: Wei
authors.forename: Wang-Yu
authors.initials: WY
authors.lastname: Tong
authors.forename: Yi-Qi
authors.initials: YQ
authors.lastname: Zhu
authors.forename: Yun-Mei
authors.initials: YM
authors.lastname: Jiang
mesh_terms: D018033:Antibodies, Bispecific / Q000737:chemistry / Q000276:immunology / Q000302:isolation & purification*; D000951:Antigens, Neoplasm / Q000276:immunology*; D017252:CD3 Complex / Q000276:immunology*; D002277:Carcinoma / Q000276:immunology*; D045744:Cell Line, Tumor; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005260:Female; D006801:Humans; D010051:Ovarian Neoplasms / Q000276:immunology*; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000276:immunology / Q000302:isolation & purification
chemical_list: D018033:Antibodies, Bispecific; D000951:Antigens, Neoplasm; D017252:CD3 Complex; D011993:Recombinant Fusion Proteins