Габибов Александр Габибович

Избранные публикации

  1. Smirnov I.V., Golovin A.V., Chatziefthimiou S.D., Stepanova A.V., Peng Y., Zolotareva O.I., Belogurov A.A. Jr, Kurkova I.N., Ponomarenko N.A., Wilmanns M., Blackburn G.M., Gabibov A.G., Lerner R.A. (2016). Robotic QM/MM-driven maturation of antibody combining sites. Sci Adv 2 (10), e1501695 [+]

    In vitro selection of antibodies from large repertoires of immunoglobulin (Ig) combining sites using combinatorial libraries is a powerful tool, with great potential for generating in vivo scavengers for toxins. However, addition of a maturation function is necessary to enable these selected antibodies to more closely mimic the full mammalian immune response. We approached this goal using quantum mechanics/molecular mechanics (QM/MM) calculations to achieve maturation in silico. We preselected A17, an Ig template, from a naïve library for its ability to disarm a toxic pesticide related to organophosphorus nerve agents. Virtual screening of 167,538 robotically generated mutants identified an optimum single point mutation, which experimentally boosted wild-type Ig scavenger performance by 170-fold. We validated the QM/MM predictions via kinetic analysis and crystal structures of mutant apo-A17 and covalently modified Ig, thereby identifying the displacement of one water molecule by an arginine as delivering this catalysis.

    ID:1605
  2. Belogurov A., Zakharov K., Lomakin Y., Surkov K., Avtushenko S., Kruglyakov P., Smirnov I., Makshakov G., Lockshin C., Gregoriadis G., Genkin D., Gabibov A., Evdoshenko E. (2016). CD206-Targeted Liposomal Myelin Basic Protein Peptides in Patients with Multiple Sclerosis Resistant to First-Line Disease-Modifying Therapies: A First-in-Human, Proof-of-Concept Dose-Escalation Study. Neurotherapeutics , [+]

    Previously, we showed that CD206-targeted liposomal delivery of co-encapsulated immunodominant myelin basic protein (MBP) sequences MBP46-62, MBP124-139 and MBP147-170 (Xemys) suppressed experimental autoimmune encephalomyelitis in dark Agouti rats. The objective of this study was to assess the safety of Xemys in the treatment of patients with relapsing-remitting multiple sclerosis (MS) and secondary progressive MS, who failed to achieve a sustained response to first-line disease-modifying therapies. In this phase I, open-label, dose-escalating, proof-of-concept study, 20 patients with relapsing-remitting or secondary progressive MS received weekly subcutaneously injections with ascending doses of Xemys up to a total dose of 2.675 mg. Clinical examinations, including Expanded Disability Status Scale score, magnetic resonance imaging results, and serum cytokine concentrations, were assessed before the first injection and for up to 17 weeks after the final injection. Xemys was safe and well tolerated when administered for 6 weeks to a maximum single dose of 900 μg. Expanded Disability Status Scale scores and numbers of T2-weighted and new gadolinium-enhancing lesions on magnetic resonance imaging were statistically unchanged at study exit compared with baseline; nonetheless, the increase of number of active gadolinium-enhancing lesions on weeks 7 and 10 in comparison with baseline was statistically significant. During treatment, the serum concentrations of the cytokines monocyte chemoattractant protein-1, macrophage inflammatory protein-1β, and interleukin-7 decreased, whereas the level of tumor necrosis factor-α increased. These results provide evidence for the further development of Xemys as an antigen-specific, disease-modifying therapy for patients with MS.

    ID:1535
  3. Ziganshin R.H., Ivanova O.M., Lomakin Y.A., Belogurov A.A. Jr, Kovalchuk S.I., Azarkin I.V., Arapidi G.P., Anikanov N.A., Shender V.O., Piradov M.A., Suponeva N.A., Vorobyeva A.A., Gabibov A.G., Ivanov V.T., Govorun V.M. (2016). The pathogenesis of demyelinating form of Guillain-Barre syndrome: proteo-peptidomic and immunological profiling of physiological fluids. Mol. Cell Proteomics , [+]

    Acute inflammatory demyelinating polyneuropathy (AIDP) - the main form of Guillain-Barre syndrome (GBS) - is a rare and severe disorder of the peripheral nervous system (PNS) with an unknown etiology. One of the hallmarks of the AIDP pathogenesis is a significantly elevated cerebrospinal fluid (CSF) protein level. In this paper CSF peptidome and proteome in AIDP were analyzed and compared with multiple sclerosis (MS) and control patients. A total protein concentration increase was shown to be due to even changes in all proteins rather than some specific response, supporting the hypothesis of protein leakage from blood through the blood-nerve barrier. The elevated CSF protein level in AIDP was complemented by activization of protein degradation and much higher peptidome diversity. Due to the studies of the acute motor axonal form, GBS as a whole is thought to be associated with autoimmune response against neurospecific molecules. Thus, in AIDP, autoantibodies against cell adhesion (CAM) proteins localized at Ranvier's nodes were suggested as possible targets in AIDP. Indeed, AIDP CSF peptidome analysis revealed CAM proteins degradation, however no reliable dependence on the corresponding autoantibodies levels was found. Proteome analysis revealed overrepresentation of Gene Ontology groups related to responses to bacteria and virus infections, which were earlier suggested as possible AIDP triggers. Immunoglobulin blood serum analysis against most common neuronal viruses did not reveal any specific pathogen; however AIDP patients were more immunopositive in average and often had polyinfections. Cytokine analysis of both AIDP CSF and blood did not show a systemic adaptive immune response or general inflammation, while innate immunity cytokines were upregulated. To supplement the widely-accepted though still unproven autoimmunity-based AIDP mechanism we propose a hypothesis of the primary PNS damaging initiated as an innate immunity-associated local inflammation following neurotropic viruses egress, while the autoantibody production might be an optional complementary secondary process.

    ID:1523
  4. Stepanov A., Belyy A., Kasheverov I., Rybinets A., Dronina M., Dyachenko I., Murashev A., Knorre V., Sakharov D., Ponomarenko N., Tsetlin V., Tonevitsky A., Deyev S., Belogurov A., Gabibov A. (2016). Development of a recombinant immunotoxin for the immunotherapy of autoreactive lymphocytes expressing MOG-specific BCRs. Biotechnol. Lett. , [+]

    Myelin oligodendrocyte glycoprotein (MOG) is one of the major autoantigens in multiple sclerosis (MS), therefore selective depletion of autoreactive lymphocytes exposing MOG-specific B cell receptors (BCRs) would be beneficial in terms of MS treatment.

    ID:1524
  5. Ponomarenko N., Chatziefthimiou S.D., Kurkova I., Mokrushina Y., Stepanova A., Smirnov I., Avakyan M., Bobik T., Mamedov A., Mitkevich V., Belogurov A., Fedorova O.S., Dubina M., Golovin A., Lamzin V., Friboulet A., Makarov A.A., Wilmanns M., Gabibov A. (2014). Role of κ→λ light-chain constant-domain switch in the structure and functionality of A17 reactibody. Acta Crystallogr. D Biol. Crystallogr. 70 (Pt 3), 708–19 [+]

    The engineering of catalytic function in antibodies requires precise information on their structure. Here, results are presented that show how the antibody domain structure affects its functionality. The previously designed organophosphate-metabolizing reactibody A17 has been re-engineered by replacing its constant κ light chain by the λ chain (A17λ), and the X-ray structure of A17λ has been determined at 1.95 Å resolution. It was found that compared with A17κ the active centre of A17λ is displaced, stabilized and made more rigid owing to interdomain interactions involving the CDR loops from the VL and VH domains. These VL/VH domains also have lower mobility, as deduced from the atomic displacement parameters of the crystal structure. The antibody elbow angle is decreased to 126° compared with 138° in A17κ. These structural differences account for the subtle changes in catalytic efficiency and thermodynamic parameters determined with two organophosphate ligands, as well as in the affinity for peptide substrates selected from a combinatorial cyclic peptide library, between the A17κ and A17λ variants. The data presented will be of interest and relevance to researchers dealing with the design of antibodies with tailor-made functions.

    ID:1245
  6. Lomakin Y.A., Zakharova M.Y., Stepanov A.V., Dronina M.A., Smirnov I.V., Bobik T.V., Pyrkov A.Y., Tikunova N.V., Sharanova S.N., Boitsov V.M., Vyazmin S.Y., Kabilov M.R., Tupikin A.E., Krasnov A.N., Bykova N.A., Medvedeva Y.A., Fridman M.V., Favorov A.V., Ponomarenko N.A., Dubina M.V., Boyko A.N., Vlassov V.V., Belogurov A.A. Jr, Gabibov A.G. (2014). Heavy-light chain interrelations of MS-associated immunoglobulins probed by deep sequencing and rational variation. Mol. Immunol. , [+]

    The mechanisms triggering most of autoimmune diseases are still obscure. Autoreactive B cells play a crucial role in the development of such pathologies and, in particular, production of autoantibodies of different specificities. The combination of deep-sequencing technology with functional studies of antibodies selected from highly representative immunoglobulin combinatorial libraries may provide unique information on specific features in the repertoires of autoreactive B cells. Here, we have analyzed cross-combinations of the variable regions of human immunoglobulins against the myelin basic protein (MBP) previously selected from a multiple sclerosis (MS)-related scFv phage-display library. On the other hand, we have performed deep sequencing of the sublibraries of scFvs against MBP, Epstein-Barr virus (EBV) latent membrane protein 1 (LMP1), and myelin oligodendrocyte glycoprotein (MOG). Bioinformatics analysis of sequencing data and surface plasmon resonance (SPR) studies have shown that it is the variable fragments of antibody heavy chains that mainly determine both the affinity of antibodies to the parent autoantigen and their cross-reactivity. It is suggested that LMP1-cross-reactive anti-myelin autoantibodies contain heavy chains encoded by certain germline gene segments, which may be a hallmark of the EBV-specific B cell subpopulation involved in MS triggering.

    ID:1009
  7. Kuzina E., Kudriaeva A., Smirnov I., Dubina M.V., Gabibov A., Belogurov A. (2014). Glatiramer Acetate and Nanny Proteins Restrict Access of the Multiple Sclerosis Autoantigen Myelin Basic Protein to the 26S Proteasome. Biomed Res Int 2014, 926394 [+]

    We recently showed that myelin basic protein (MBP) is hydrolyzed by 26S proteasome without ubiquitination. The previously suggested concept of charge-mediated interaction between MBP and the proteasome led us to attempt to compensate or mimic its positive charge to inhibit proteasomal degradation. We demonstrated that negatively charged actin and calmodulin (CaM), as well as basic histone H1.3, inhibit MBP hydrolysis by competing with the proteasome and MBP, respectively, for binding their counterpart. Interestingly, glatiramer acetate (GA), which is used to treat multiple sclerosis (MS) and is structurally similar to MBP, inhibits intracellular and in vitro proteasome-mediated MBP degradation. Therefore, the data reported in this study may be important for myelin biogenesis in both the normal state and pathophysiological conditions.

    ID:1089
  8. Gasparian M.E., Bobik T.V., Kim Y.V., Ponomarenko N.A., Dolgikh D.A., Gabibov A.G., Kirpichnikov M.P. (2013). Heterogeneous catalysis on the phage surface: Display of active human enteropeptidase. Biochimie 95 (11), 2076–81 [+]
    ID:924
  9. Ilyushin D.G., Smirnov I.V., Belogurov A.A. Jr, Dyachenko I.A., Zharmukhamedova T.I.u., Novozhilova T.I., Bychikhin E.A., Serebryakova M.V., Kharybin O.N., Murashev A.N., Anikienko K.A., Nikolaev E.N., Ponomarenko N.A., Genkin D.D., Blackburn G.M., Masson P., Gabibov A.G. (2013). Chemical polysialylation of human recombinant butyrylcholinesterase delivers a long-acting bioscavenger for nerve agents in vivo. Proc. Natl. Acad. Sci. U.S.A. 110 (4), 1243–8 [+]

    The creation of effective bioscavengers as a pretreatment for exposure to nerve agents is a challenging medical objective. We report a recombinant method using chemical polysialylation to generate bioscavengers stable in the bloodstream. Development of a CHO-based expression system using genes encoding human butyrylcholinesterase and a proline-rich peptide under elongation factor promoter control resulted in self-assembling, active enzyme multimers. Polysialylation gives bioscavengers with enhanced pharmacokinetics which protect mice against 4.2 LD(50) of S-(2-(diethylamino)ethyl) O-isobutyl methanephosphonothioate without perturbation of long-term behavior.

    ID:1246
  10. Zakharova M.Y., Kuznetsov N.A., Dubiley S.A., Kozyr A.V., Fedorova O.S., Chudakov D.M., Knorre D.G., Shemyakin I.G., Gabibov A.G., Kolesnikov A.V. (2009). Substrate recognition of anthrax lethal factor examined by combinatorial and pre-steady-state kinetic approaches. J. Biol. Chem. 284 (27), 17902–13 [+]

    Lethal factor (LF), a zinc-dependent protease of high specificity produced by Bacillus anthracis, is the effector component of the binary toxin that causes death in anthrax. New therapeutics targeting the toxin are required to reduce systemic anthrax-related fatalities. In particular, new insights into the LF catalytic mechanism will be useful for the development of LF inhibitors. We evaluated the minimal length required for formation of bona fide LF substrates using substrate phage display. Phage-based selection yielded a substrate that is cleaved seven times more efficiently by LF than the peptide targeted in the protein kinase MKK6. Site-directed mutagenesis within the metal-binding site in the LF active center and within phage-selected substrates revealed a complex pattern of LF-substrate interactions. The elementary steps of LF-mediated proteolysis were resolved by the stopped-flow technique. Pre-steady-state kinetics of LF proteolysis followed a four-step mechanism as follows: initial substrate binding, rearrangement of the enzyme-substrate complex, a rate-limiting cleavage step, and product release. Examination of LF interactions with metal ions revealed an unexpected activation of the protease by Ca(2+) and Mn(2+). Based on the available structural and kinetic data, we propose a model for LF-substrate interaction. Resolution of the kinetic and structural parameters governing LF activity may be exploited to design new LF inhibitors.

    ID:301
  11. Reshetnyak A.V., Armentano M.F., Ponomarenko N.A., Vizzuso D., Durova O.M., Ziganshin R., Serebryakova M., Govorun V., Gololobov G., Morse H.C. 3rd, Friboulet A., Makker S.P., Gabibov A.G., Tramontano A. (2007). Routes to covalent catalysis by reactive selection for nascent protein nucleophiles. J. Am. Chem. Soc. 129 (51), 16175–82 [+]

    Reactivity-based selection strategies have been used to enrich combinatorial libraries for encoded biocatalysts having revised substrate specificity or altered catalytic activity. This approach can also assist in artificial evolution of enzyme catalysis from protein templates without bias for predefined catalytic sites. The prevalence of covalent intermediates in enzymatic mechanisms suggests the universal utility of the covalent complex as the basis for selection. Covalent selection by phosphonate ester exchange was applied to a phage display library of antibody variable fragments (scFv) to sample the scope and mechanism of chemical reactivity in a naive molecular library. Selected scFv segregated into structurally related covalent and noncovalent binders. Clones that reacted covalently utilized tyrosine residues exclusively as the nucleophile. Two motifs were identified by structural analysis, recruiting distinct Tyr residues of the light chain. Most clones employed Tyr32 in CDR-L1, whereas a unique clone (A.17) reacted at Tyr36 in FR-L2. Enhanced phosphonylation kinetics and modest amidase activity of A.17 suggested a primitive catalytic site. Covalent selection may thus provide access to protein molecules that approximate an early apparatus for covalent catalysis.

    ID:134
  12. Ponomarenko N.A., Durova O.M., Vorobiev I.I., Belogurov A.A. Jr, Kurkova I.N., Petrenko A.G., Telegin G.B., Suchkov S.V., Kiselev S.L., Lagarkova M.A., Govorun V.M., Serebryakova M.V., Avalle B., Tornatore P., Karavanov A., Morse H.C. 3rd, Thomas D., Friboulet A., Gabibov A.G. (2006). Autoantibodies to myelin basic protein catalyze site-specific degradation of their antigen. Proc. Natl. Acad. Sci. U.S.A. 103 (2), 281–6 [+]

    Autoantibody-mediated tissue destruction is among the main features of organ-specific autoimmunity. This report describes "an antibody enzyme" (abzyme) contribution to the site-specific degradation of a neural antigen. We detected proteolytic activity toward myelin basic protein (MBP) in the fraction of antibodies purified from the sera of humans with multiple sclerosis (MS) and mice with induced experimental allergic encephalomyelitis. Chromatography and zymography data demonstrated that the proteolytic activity of this preparation was exclusively associated with the antibodies. No activity was found in the IgG fraction of healthy donors. The human and murine abzymes efficiently cleaved MBP but not other protein substrates tested. The sites of MBP cleavage determined by mass spectrometry were localized within immunodominant regions of MBP. The abzymes could also cleave recombinant substrates containing encephalytogenic MBP(85-101) peptide. An established MS therapeutic Copaxone appeared to be a specific abzyme inhibitor. Thus, the discovered epitope-specific antibody-mediated degradation of MBP suggests a mechanistic explanation of the slow development of neurodegeneration associated with MS.

    ID:132
  13. Ponomarenko N.A., Vorobiev I.I., Alexandrova E.S., Reshetnyak A.V., Telegin G.B., Khaidukov S.V., Avalle B., Karavanov A., Morse H.C. 3rd, Thomas D., Friboulet A., Gabibov A.G. (2006). Induction of a protein-targeted catalytic response in autoimmune prone mice: antibody-mediated cleavage of HIV-1 glycoprotein GP120. Biochemistry 45 (1), 324–30 [+]

    We have induced a polyclonal IgG that degrades the HIV-1 surface antigen, glycoprotein gp120, by taking advantage of the susceptibility of SJL mice to a peptide-induced autoimmune disorder, experimental autoimmune encephalomyelitis (EAE). Specific pathogen-free SJL mice were immunized with structural fragments of gp120, fused in-frame with encephalitogenic peptide MBP(85-101). It has resulted in a pronounced disease-associated immune response against antigens. A dramatic increase of gp120 degradation level by purified polyclonal IgG from immunized versus nonimmunized mice has been demonstrated by a newly developed fluorescence-based assay. This activity was inhibited by anti-mouse immunoglobulin antibodies as well as by Ser- and His-reactive covalent inhibitors. A dominant proteolysis site in recombinant gp120 incubated with purified polyclonal IgG from immunized mice was shown by SDS-PAGE. The SELDI-based mass spectrometry revealed that these antibodies exhibited significant specificity toward the Pro484-Leu485 peptide bond. The sequence surrounding this site is present in nearly half of the HIV-I variants. This novel strategy can be generalized for creating a catalytic vaccine against viral pathogens.

    ID:133
  14. Shuster A.M., Gololobov G.V., Kvashuk O.A., Bogomolova A.E., Smirnov I.V., Gabibov A.G. (1992). DNA hydrolyzing autoantibodies. Science 256 (5057), 665–7 [+]

    A DNA-nicking activity was detected in the sera of patients with various autoimmune pathologies and was shown to be a property of autoantibodies. The DNA hydrolyzing activity, which was purified by affinity and high-performance liquid chromatography, corresponded in size to immunoglobulin M (IgM) and IgG and had a positive response to antibodies to human IgG. The DNA hydrolyzing autoantibodies were stable to acid shock and yielded a DNA degradation pattern that was different from that of deoxyribonuclease (DNase) I and blood DNase.

    ID:131