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You are here: Home / Archives for bioinformatics

Call for Papers on Biopharmaceutical Informatics

January 19, 2021 by Janice Reichert

As evident from papers published in mAbs in recent years, computation is being increasingly used in the discovery and development of antibody-based biologic drugs. To celebrate the rise of biopharmaceutical informatics directed towards antibody R & D, we invite The Antibody Society members, mAbs readers and the broader scientific community to contribute review articles focused on highlighting how computation has enabled their investigations or led them to new ones. The reviews should narrate the state of the art and speculate on new vistas for computational applications in the field.

We are particularly interested in reviews in the following topics:

  • Analyses of immune repertoires and their role in target validation and drug discovery.
  • Analyses of antibody structure-function relationships with emphasis on therapeutic antibody-based biologics.
  • Structure-based design of antibody fragments (e.g., nanobodies) and antibody-based multi-specific molecular formats.
  • Design of antibody libraries for different display strategies and/or with improved developability.
  • Structure-based affinity maturation and optimization of biologic lead candidates.
  • Molecular simulations of antibodies to understand their solution behaviors, such as aggregation, viscosity and physicochemical degradation.
  • Consideration of developability in biologic drug discovery and design.
  • Developability assessments at early-stage development.
  • Specific and non-specific interactions formed by antibodies in vitro and in vivo.
  • Computation in antibody formulations – design of novel excipients.
  • Applications of artificial Intelligence and machine learning towards antibody discovery, development and manufacturing.
  • Progress and challenges in modeling antibodies and multi-specific formats.
  • Predicting chemical degradation in antibody-based biologic drugs.
  • Optimizing antigens for greater immunization success.

Although these topics are especially of interest, we welcome well-written reviews in related areas as well.

Publication charges will be waived for six of the best review articles selected from pre-submission inquiries, which should consist of the title, abstract and general outline of the intended review article.

The deadline for the pre-submission enquiries is February 15, 2021, and the deadline for submission of the completed review articles is June 30, 2021.

Please send pre-submission inquiries to Assistant Editor Dr. Sandeep Kumar (skumarmabs@gmail.com) and Editor-in-Chief Dr. Janice Reichert (reichert.biotechconsulting@gmail.com), and contact us if you have any questions.

Filed Under: Antibody discovery Tagged With: antibody discovery, antibody therapeutics, bioinformatics

Cyrus Chothia – In Memoriam

November 27, 2019 by The Antibody Society

Post contributed by: Prof. Andrew C.R. Martin, Professor of Bioinformatics and Computational Biology; SMB Graduate Tutor
Institute of Structural and Molecular Biology, University College London

Cyrus Chothia, FRS, (19 February 1942 – 26 November 2019), was an emeritus scientist at the Medical Research Council Laboratory of Molecular Biology (LMB) in Cambridge, UK where he was a fellow of Wolfson College. He studied at Durham University, followed by an MSc at Birkbeck College, University of London, a small college but famed for its involvement in the development of structural biology and x-ray crystallography, being the home of such luminaries as J.D. Bernal, Aaron Klug and Rosalind Franklin. This was followed by a PhD at University College London supervised by Peter Pauling, son of Linus Pauling. Cyrus was one of the founding fathers of structural bioinformatics and made a particular contribution in the antibody field. Amongst others, he worked with Nobel prize winner, Michael Levitt, Joel Janin, Alexey Murzin, Tim Hubbard and Anna Tramontano, but he is perhaps best known for his work with Arthur Lesk. His PhD students included a number of people who have gone on to make major contributions in bioinformatics, such as Alex Bateman, Steve Brenner, Mark Gerstein, Julian Gough, Sarah Teichmann, and Bissan Al-Lazikani.

Back in the early 1970s, Wu and Kabat had demonstrated the presence of hypervariable sequence regions in antibody variable domains that they suggested would form structural loops or complementarity-determining regions (CDRs) that come together in 3D to form the binding site. This was confirmed when Poljak solved the first antibody crystal structure, and it was assumed that the CDRs would also be extremely variable in structure. I first met Cyrus in the late 1980s when I was doing my DPhil in Oxford on modelling antibody combining sites with Anthony Rees. By that time, around eight structures of antibodies, or Bence Jones light chain dimers, were available and Cyrus, together with Arthur Lesk, compared these. They found that, with the exception of the third CDR of the heavy chain (CDR-H3), the structures of the remaining CDRs were remarkably conserved. Further they proposed that the presence of certain ‘key residues’ – either within the CDRs, or packing against them – would define the conformation [PMID: 3090684, 3681981, 2687698]. To be frank, Tony and I didn’t really believe it. After all, there were potentially billions of antibody sequences and they had looked at fewer than 10. Cyrus and Arthur came to visit us in Oxford, and I remember sitting in The Eagle and Child with them discussing these ideas. Cyrus was always modest and completely accepted that they may be wrong, but of course they turned out to be largely correct. As more structures became available, the rules evolved with the importance of other positions being recognized [PMID: 2118959], but the principle was completely upheld. When we published a paper on key residues in 1986, I spoke to him about one of the outliers that appeared not to follow the rules. His view (which was almost certainly correct!) was that the crystal structure was wrong. More recent analysis by ourselves and others has suggested that the rules aren’t always as precise as might once have been thought and the requirements for framework mutations outside the key residues in order to achieve good binding in antibody humanization supports the view that the precise conformation is influenced by other residues and the detail of the environment around the CDRs.

Cyrus introduced a definition of the ‘structural loops’ in antibodies. These are frequently referred to as the ‘Chothia CDRs’, a term that he did not like as, in his view, the CDRs were the sequence-variable regions defined by Wu and Kabat, while his definition related to regions that were structurally variable and he would not presume to redefine what had been done by Wu and Kabat. In fact, his definitions changed over his various papers as more structural information became available. He also introduced the Chothia numbering scheme for antibodies, which was based on Kabat numbering but corrected the insertion sites in CDR-L1 and CDR-H1 to be structurally correct. Unfortunately in 1989, they made an error such that the insertions in CDR-L1 were placed after residue L31 rather than L30. As another example of his humility and modesty, I happened to referee a paper of theirs in 1997 and recognized this error. He guessed that I was the referee, contacted me, and immediately accepted the correction.

While I have focussed on his work on antibodies, he was widely known for his work in many areas of understanding protein structure. He was elected as a Fellow of the Royal Society (FRS) in 2000, for having “shown how the amino sequences of proteins determine their structure, function and evolution”. To name just a few of his contributions, he developed the SCOP classification of protein structure with Alexey Murzin [PMID: 7723011] and the SUPERFAMILY database with Julian Gough. He studied multi-domain proteins [PMID: 15093836], protein packing [PMID: 10388571] and was involved in functional annotation of more than 60,000 cDNAs from the mouse transcriptome [PMID: 12466851]. As well as his work on the conformation of the CDRs, he examined the packing of VH and VL domains in antibodies [PMID: 4093982] and examined the evolution of immunoglobulin domains in general [PMID: 7175935]. With Bissan Al-Lazikani, he published his final paper on canonical classes of antibody CDRs [PMID: 9367782], but then extended this into T-cell alpha-beta receptors [PMID: 10656805].

Cyrus made enormous contributions to our understanding of protein evolution in general as well as of the structure of antibodies. He will be hugely missed by the scientific community, and by me personally. His science and the many well-known scientists who did their PhDs with him or were influenced by him, are a huge and lasting legacy.

Filed Under: Bioinformatics Tagged With: bioinformatics, Cyrus Chothia

Anna Tramontano – In Memoriam

August 21, 2017 by The Antibody Society

Written by Dr. Andrew Martin, Institute of Structural and Molecular Biology, University College London

Anna Tramontano (14 July 1957 – 10 March 2017), Professor of Biochemistry at the “Sapienza” University in Rome, was an outstanding scientist who made hugely important contributions to our understanding of antibody structure.

She obtained her PhD in physics from the University of Naples in 1980, but then moved to a post doc at the University of California, San Francisco. At a time when molecular graphics meant using specialized hardware – some the size of a small refrigerator – she developed a software package which was later commercialized as InsightII. In 1988, she moved to the European Molecular Biology Laboratory (EMBL) in Heidelberg to work with Arthur Lesk on analysis and modelling of antibodies. Between 1989 and 1990, together with Cyrus Chothia in Cambridge, Anna and Arthur published three key papers on the conformation of antibody complementarity-determining regions (CDRs) [1-3] – a development of the idea of canonical conformations of CDRs first published by Cyrus, Arthur and others in 1986 [4]. At this time, I was doing my D.Phil. in Oxford with Tony Rees on modelling antibodies and, to be frank, we didn’t believe this work!  They were claiming that five of the six hypervariable antibody CDRs adopted only a small number of conformations defined by the length of the loop and the presence of a small number of key residues both within, and outside, the CDRs.  However, this was based on analysis of only about eight available structures from the billions and billions of possible antibodies.  Indeed, when the third of those papers came out [5], our view seemed to be reinforced – it appeared to be an exception to the rules – and we expected that there would be lots of these exceptions in future.  However, with over 1000 antibody structures now available, some enhancements to the simple rules in those papers are still able to predict the conformations of five of the six CDRs with high accuracy.

In the early 1990s, Anna returned to a research institute in Rome that was then acquired by Merck & Co. She was involved in developing methods for designing both inhibitors and proteins and in protein modelling and docking.  She continued to publish in the area of antibodies throughout the 1990s including work on phage display libraries [6-9], modelling [10-13], docking [14] and epitope prediction [15].

In 2001, she became a full professor at the Sapienza University in Rome where she continued her interest in protein structure, but also started to look at RNA molecules and their structure, but hardly published on antibodies again until 2008 when she developed the PIGS server for the automatic prediction of antibody structure [16, 17]. She then revived her interest in antibodies, among other things looking at the structural repertoire of immunoglobulin lambda light chains [18], the association of light and heavy variable domains [19], and mutations in paired light and heavy chains in chronic lymphocytic leukemia B cells [20]. In 2012, she created a database of antibodies together with a set of integrated tools known as DIGIT [21], a complement to servers such as IMGT, SAbDab and our own abYsis. Since then she has developed the proABC server for predicting interactions in antibody-antigen complexes [22], improved the modelling of CDR-H3 [23]; developed tools for antibody humanization [24]; developed methods for profiling antigen regions recognized by serum antibodies from NextGen sequencing [25] and methods for comparison and clustering of antibody binding sites [26].

Anna was a Fellow and Vice President of the International Society of Computational Biology (ISCB), which is responsible for the largest international bioinformatics conference (Intelligent Systems for Molecular Biology (ISMB)). She was also an organizer of the European Conference on Computational Biology (ECCB) and, with John Moult, of the Critical Assessment of Structure Prediction (CASP) experiment held every other year to assess progress on protein modelling.  She was passionate about training in Bioinformatics and about encouraging young scientists.

Here I have focussed on her work on antibodies, but she was hugely influential in many areas of Bioinformatics. She will be greatly missed by the scientific community, and by me personally. She was always very supportive of my research and nominated me as an expert on the nomenclature of antibody-based drugs to the WHO-INN. Her science and the scientists that she has mentored and trained will remain as her lasting legacy.

1.      Tramontano A, Chothia C, Lesk AM. Structural determinants of the conformations of medium-sized loops in proteins. Proteins. 1989;6(4):382-94. PMID: 2622909.
2.      Chothia C, Lesk AM, Tramontano A, Levitt M, Smith-Gill SJ, Air G, Sheriff S, Padlan EA, Davies D, Tulip WR, et al. Conformations of immunoglobulin hypervariable regions. Nature. 1989 Dec 21-28;342(6252):877-83. PMID: 2687698.
3.      Tramontano A, Chothia C, Lesk AM. Framework residue 71 is a major determinant of the position and conformation of the second hypervariable region in the VH domains of immunoglobulins. J Mol Biol. 1990 Sep 5;215(1):175-82. PMID: 2118959.
4.      Chothia C, Lesk AM, Levitt M, Amit AG, Mariuzza RA, Phillips SE, Poljak RJ.The predicted structure of immunoglobulin D1.3 and its comparison with the crystal structure. Science. 1986 Aug 15;233(4765):755-8. PMID: 3090684.
5.      Tramontano A, Chothia C, Lesk AM. Framework residue 71 is a major determinant of the position and conformation of the second hypervariable region in the VH domains of immunoglobulins. J Mol Biol. 1990 Sep 5;215(1):175-82. PMID: 2118959.
6.      Leplae R, Tramontano A. PLANET: a phage library analysis expert tool.Physiol Chem Phys Med NMR. 1995;27(4):331-8. PMID: 8768788.
7.      Cortese R, Monaci P, Nicosia A, Luzzago A, Felici F, Galfré G, Pessi A, Tramontano A, Sollazzo M. Identification of biologically active peptides using random libraries displayed on phage. Curr Opin Biotechnol. 1995 Feb;6(1):73-80. PMID: 7534506.
8.      Luzzago A, Felici F, Tramontano A, Pessi A, Cortese R. Mimicking of discontinuous epitopes by phage-displayed peptides, I. Epitope mapping of human H ferritin using a phage library of constrained peptides. Gene. 1993 Jun 15;128(1):51-7. PMID: 7685301.
9.      Tramontano A, Pizzi E, Felici F, Luzzago A, Nicosia A, Cortese R. A database system for handling phage library-derived sequences. Gene. 1993 Jun 15;128(1):143-4. PMID: 8508956.
10.  Tramontano A, Lesk AM. Proteins. 1992 Jul;13(3):231-45. Common features of the conformations of antigen-binding loops in immunoglobulins and application to modeling loop conformations. PMID: 1603812.
11.  Morea V, Tramontano A, Rustici M, Chothia C, Lesk AM. Conformations of the third hypervariable region in the VH domain of immunoglobulins. J Mol Biol. 1998 Jan 16;275(2):269-94. PMID: 9466909.
12.  Morea V, Tramontano A, Rustici M, Chothia C, Lesk AM .Antibody structure, prediction and redesign. Biophys Chem. 1997 Oct;68(1-3):9-16. PMID: 9468606
13.  Morea V, Lesk AM, Tramontano A. Antibody modeling: implications for engineering and design. Methods. 2000 Mar;20(3):267-79. PMID: 10694450.
14.  Helmer-Citterich M, Rovida E, Luzzago A, Tramontano A. Modelling antibody-antigen interactions: ferritin as a case study. Mol Immunol. 1995 Sep;32(13):1001-10. PMID: 7476997.
15.  Pizzi E, Cortese R, Tramontano A. Mapping epitopes on protein surfaces. Biopolymers. 1995 Nov;36(5):675-80. PMID: 7578958.
16.  Marcatili P1, Rosi A, Tramontano A. PIGS: automatic prediction of antibody structures. Bioinformatics. 2008 Sep 1;24(17):1953-4. doi: 10.1093/bioinformatics/btn341. PMID: 18641403.
17.  Lepore R, Olimpieri PP, Messih MA, Tramontano A. PIGSPro: prediction of immunoGlobulin structures v2. Nucleic Acids Res. 2017 May 4. doi: 10.1093/nar/gkx334. PMID: 28472367.
18.  Chailyan A, Marcatili P, Cirillo D, Tramontano A. Structural repertoire of immunoglobulin λ light chains. Proteins. 2011 May;79(5):1513-24. doi: 10.1002/prot.22979. PMID: 21365679.
19.  Chailyan A, Marcatili P, Tramontano A. The association of heavy and light chain variable domains in antibodies: implications for antigen specificity. FEBS J. 2011 Aug;278(16):2858-66. doi: 10.1111/j.1742-4658.2011.08207.x. PMID: 21651726.
20.  Ghiotto F, Marcatili P, Tenca C, Calevo MG, Yan XJ, Albesiano E, Bagnara D, Colombo M, Cutrona G, Chu CC, Morabito F, Bruno S, Ferrarini M, Tramontano A, Fais F, Chiorazzi N. Mutation pattern of paired immunoglobulin heavy and light variable domains in chronic lymphocytic leukemia B cells. Mol Med. 2011;17(11-12):1188-95. doi: 10.2119/molmed.2011.00104. PMID: 21785810.
21.  Chailyan A, Tramontano A, Marcatili P. A database of immunoglobulins with integrated tools: DIGIT. Nucleic Acids Res. 2012 Jan;40(Database issue):D1230-4. doi: 10.1093/nar/gkr806. PMID: 22080506.
22.  Olimpieri PP, Chailyan A, Tramontano A, Marcatili P. Prediction of site-specific interactions in antibody-antigen complexes: the proABC method and server. Bioinformatics. 2013 Sep 15;29(18):2285-91. doi: 10.1093/bioinformatics/btt369. PMID: 23803466.
23.  Messih MA, Lepore R, Marcatili P, Tramontano A. Improving the accuracy of the structure prediction of the third hypervariable loop of the heavy chains of antibodies. Bioinformatics. 2014 Oct;30(19):2733-40. doi: 10.1093/bioinformatics/btu194. PMID: 24930144
24.  Olimpieri PP, Marcatili P, Tramontano A. Tabhu: tools for antibody humanization. Bioinformatics. 2015 Feb 1;31(3):434-5. doi: 10.1093/bioinformatics/btu667. PMID: 25304777.
25.  Domina M, Lanza Cariccio V, Benfatto S, D’Aliberti D, Venza M, Borgogni E, Castellino F, Biondo C, D’Andrea D, Grassi L, Tramontano A, Teti G, Felici F, Beninati C. Rapid profiling of the antigen regions recognized by serum antibodies using massively parallel sequencing of antigen-specific libraries. PLoS One. 2014 Dec 4;9(12):e114159. doi: 10.1371/journal.pone.0114159. PMID: 25473968.
26. Di Rienzo L, Milanetti E, Lepore R, Olimpieri PP, Tramontano A. Superposition-free comparison and clustering of antibody binding sites: implications for the prediction of the nature of their antigen. Scientific Reports 2017;7:45053.

Filed Under: Bioinformatics Tagged With: bioinformatics

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