JC1 26.11.13 Yakse - rna.uzh.ch

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Journal Club 2, 26.11.2013 Yakushev Sergey Natureinspired design of motifspecific antibody scaffolds * Nature Biotechnology, October 2013, Vol. 31, #10 Jim Wells, Ph.D. Professor University of California San Francisco Department of Pharmaceutical Chemistry Phone: 14155144498 Email: [email protected] JT Koerber, Ph.D. Ph.D. University of California, Berkeley B.S. University of Illinois Project: Engineering Protein Scaffolds to Detect Cellular Apoptosis Email: [email protected] * Scientific information in the following slides is from this article, if not stated otherwise

Transcript of JC1 26.11.13 Yakse - rna.uzh.ch

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Journal Club 2, 26.11.2013 Yakushev Sergey

Nature‐inspired design of motif‐specific antibody scaffolds*

Nature Biotechnology, October 2013, Vol. 31, #10

Jim Wells, Ph.D.ProfessorUniversity of California San FranciscoDepartment of Pharmaceutical ChemistryPhone: 1‐415‐514‐4498Email: [email protected]

JT Koerber, Ph.D.Ph.D. University of California, BerkeleyB.S. University of IllinoisProject: Engineering Protein Scaffolds to Detect Cellular ApoptosisEmail: [email protected]

* Scientific information in the following slides is from this article, if not stated otherwise

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Outline

1. Background (traditional and recombinant AB production)

2. Motivation for the study, aims

3. Study design, Models, Methods

4. Results

5. Discussion: Significance and relevance of the results

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BackgroundProduction of AB

Feature Polyclonal sera Hybridoma mAB In vitro‐selected mAB

Therapeutic use Not for chronic diseases Requires humanization Yes

Toxic antigen Difficult Difficult Possible

Minimal time for selection Months Months Weeks

Predetermination of epitope structure, conformation specificity, avoid cross‐reactivity

Not possible Not possible Adjustment of selection conditions, introducing competitors

Costs Animal facility Animal facility In vitro automated liquid handling

Immunization

MorphoSys©

Genetic information, Expression and Display

Diversity 107‐13

hybridomahybridoma

S. Dübel, Trends in Biotechnology, 2010

Display

H. Hoogenboom Nature Biotechnology, 2005 

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BackgroundProduction of AB

Feature Polyclonal sera Hybridoma mAB In vitro‐selected mAB

Therapeutic use Not for chronic diseases Requires humanization Yes

Toxic antigen Difficult Difficult Possible

Minimal time for selection Months Months Weeks

Predetermination of epitope structure, conformation specificity, avoid cross‐reactivity

Not possible Not possible Adjustment of selection conditions, introducing competitors

Costs Animal facility Animal facility In vitro automated liquid handling

Immunization

MorphoSys©

Genetic information, Expression and Display

hybridomahybridoma

S. Dübel, Trends in Biotechnology, 2010

Display

H. Hoogenboom Nature Biotechnology, 2005 

Diversity 107‐13

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BackgroundProduction of AB specific to post translational modifications (PTMs)

Ideal antibody against PTM

1. Exclusive PTM2. Exclusive targeted AA3. High affinity4. Renewability5. Cheap and quick6. All types of applications

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BackgroundProduction of AB specific to Phosphorylated AA

O Vielemeyer et a.,The Journal of Biological Chemistry,July 2009

1. Exclusive PTM +2. Targeted AA ‐/+3. High affinity +4. Renewability ‐5. Cheap and quick ‐6. All types of 

applications ‐/+Threat:Antigen processing

1. Exclusive PTM +2. Targeted AA +3. High affinity +4. Renewability ‐5. Cheap and quick ‐/+6. All types of applications ‐/+Threat:Far more rear AB, selection complexity (20 times more clones for selection)

Kehoe JW, Mol Cell Proteomics. 2006

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BackgroundProduction of AB specific to Phosphorylated AA

H.H. Shih et al.,The Journal of Biological Chemistry,November 2012

Phosphopeptide mixture

Phosphorylated Tau protein

Library 3.8x108

Kd 100‐1nM

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Motivation for the study and aim

Reduction of the selection steps in display technology and fixation of specificity to the PTM with targeted AA

1. Exclusive PTM2. Exclusive targeted AA3. High affinity4. Renewability5. Cheap and quick6. All types of applications

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Study design, models, methods

Common structure of anion (phosphate group) binding motif in protein super‐families:kinases and ATPases

anion

hydrogen bondsamid of the protein main chain

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Study design, models, methodsScreen existing mAB scaffolds library for the desired anion recognition region

Novimune©

Asp of antigen peptide

KGNYVVTDH

O. Stoevesandt,Nature Biotechnology, October 2013

anion recognitionSTGGYN

reader region

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Study design, models, methods

KGNYVVTDH

Antigen peptide CDR H2 region+ +

Selection:Phage display selectionELISAWB

STGGYN

Generation:1. Antigen phosphopeptide

• Phosphorylated AA• Sequence of rest of 

the peptide 2. Phage libraries

Structure analysis:X‐ray crystallographyModeling

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ResultsDoes parent H2 scaffold STGGYN (anion recognition) binds phosphopeptides?

KGNYVVTDH

KGNYVVTpTH

KGNYVVTpSH

KGNYVVTpYHKGNYVVTYH

KGNYVVTSH

KGNYVVTTH

KGNYVVTAH

Competition Fab‐phage binding to the immobilized wild‐type peptide

Phospho T and S bind, but with low affinity

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ResultsAdjustment of the parent H2 scaffold for binding of phosphopeptides

S  T  G  G Y  N52  52A 53   54    55  56

Phage libraryPhage display selection

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ResultsWhat do the AA in the H2 scaffold actually do?

Anchoring (52), Conformation  (54), Specificity (53, 55, 56)

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Results

Novimune©

Adjust anion recognition region (H2)

KGNYVVTDH

KGNYVVTpTH

KGNYVVTpSH

KGNYVVTpYH

1. Exclusive PTM 2. Exclusive targeted AA

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ResultsAdjust reader region (H3, L3)

Novimune©

KGNYVVTpTH

KGNYVVTpSH

KGNYVVTpYH XXXXXXXpYX

XXXXXXXpSX

XXXXXXXpTX

3. High affinity !4. Renewability !

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ResultsLibrary for reader region

Display to the number of targets

Target Selected scFvs with fixed H2 phosphate recognition regionand selective to the specific target

KGNYVVTpTH

KGNYVVTpSH

KGNYVVTpYH XXXXXXXpYX

XXXXXXXpSX

XXXXXXXpTX

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ResultsSpecificity of the selected scFvs validated by ELISA

ELISA

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ResultsValidation of the selected scFvs with WB on phosphorylated full length proteins 

FLAG‐tagged target proteins from HEK293T cells +/‐ treated with alkaline phosphatase (AP)

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ConclusionNature inspired

design of motif‐specific antibody scaffolds

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DiscussionSignificance and relevance of the results

• High affinity (42‐250 nM Kd)• Easier/quicker selection in phage display (conserved phosphate binding nest): competition 

with unphosphorylated peptide

JT Koerber, Ph.D.Ph.D. University of California, BerkeleyB.S. University of IllinoisProject: Engineering Protein Scaffolds to Detect Cellular ApoptosisEmail: [email protected]

= High throughput biomarker screening 

Fixed PTM recognizing nest in the library

Phage Display Library (random)Direct Selection of Monoclonal Phosphospecific Antibodies without Prior Phosphoamino Acid MappingOle Vielemeyer, JBC, 2009

Phage Display Library from pre‐immunized animalAn Ultra‐specific Avian Antibody to Phosphorylated Tau Protein Reveals a Unique Mechanism for PhosphoepitopeRecognitionHeather H. Shih, JBC, 2012