title: Systemic lupus erythematosus: molecular cloning and analysis of 22 individual recombinant monoclonal kappa light chains specifically hydrolyzing human myelin basic protein.
abstract: Antibodies hydrolyzing myelin basic protein (MBP) can play an important role in the pathogenesis of multiple sclerosis (MS) and systemic lupus erythematosus (SLE). An immunoglobulin light chain phagemid library derived from peripheral blood lymphocytes of patients with SLE was used. Small pools of phage particles displaying light chains with different affinities for MBP were isolated by affinity chromatography on MBP-Sepharose, and the fraction eluted with 0.5 M NaCl was used for preparation of individual monoclonal light chains (MLChs, 26-27 kDa). Seventy-two of 440 individual colonies were randomly chosen, expressed in Escherichia coli in a soluble form, and MLChs were purified by metal chelating chromatography. Twenty-two of 72 MLChs have high affinity and efficiently hydrolyze only MBP (not other control proteins) demonstrating various pH optima in a 5.7-9.0 range and different substrate specificity in the hydrolysis of four different MBP oligopeptides. Four MLChs demonstrated serine protease-like and three thiol protease-like activities, while 11 MLChs were metalloproteases. The activity of three MLChs was inhibited by both phenylmethylsulfonyl fluoride (PMSF) and Ethylenediaminetetraacetic acid (EDTA), two other by EDTA and iodoacetamide, and one by PMSF, EDTA, and iodoacetamide. The ratio of relative activity in the presence of Ca(2+), Mg(2+), Mn(2+), Ni(2+), Zn(2+), Cu(2+), and Co(2+) was individual for each of 22 MLCh preparations. It is the first examples of human MLChs, which probably can possess two or even three different proteolytic activities. These observations suggest an extreme diversity of anti-MBP abzymes in SLE patients. The immune systems of individual SLE patients can generate a variety of anti-MBP abzymes, which can attack MBP of myelin-proteolipid sheath of axons and play an important role in MS and SLE pathogenesis.
authors: SB RAS, Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentiev Ave., 630090, Novosibirsk, Russia.
authors: Anna M
authors: AM
authors: Timofeeva
authors: SB RAS, Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentiev Ave., 630090, Novosibirsk, Russia.|Novosibirsk State University, 2 Pirogova St., 630090, Novosibirsk, Russia.
authors: Valentina N
authors: VN
authors: Buneva
authors: SB RAS, Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentiev Ave., 630090, Novosibirsk, Russia.|Novosibirsk State University, 2 Pirogova St., 630090, Novosibirsk, Russia.
authors: Georgy A
authors: GA
authors: Nevinsky
mesh_terms: D001435:Bacteriophages / Q000235:genetics; D003001:Cloning, Molecular; D004926:Escherichia coli; D006801:Humans; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007147:Immunoglobulin Light Chains / Q000737:chemistry / Q000235:genetics / Q000276:immunology*; D008024:Ligands; D008180:Lupus Erythematosus, Systemic / Q000097:blood / Q000201:enzymology / Q000276:immunology*; D008214:Lymphocytes / Q000201:enzymology; D008670:Metals / Q000737:chemistry / Q000276:immunology; D004676:Myelin Basic Protein / Q000737:chemistry / Q000276:immunology / Q000378:metabolism*; D009842:Oligopeptides / Q000737:chemistry / Q000276:immunology; D019151:Peptide Library; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D013379:Substrate Specificity / Q000276:immunology
chemical_list: D007147:Immunoglobulin Light Chains; D008024:Ligands; C499048:MBP protein, human; D008670:Metals; D004676:Myelin Basic Protein; D009842:Oligopeptides; D019151:Peptide Library; D011994:Recombinant Proteins
keywords: extreme diversity of abzymes; hydrolysis of myelin basic protein; recombinant monoclonal light chains; systemic lupus erythematosus