m5p seminars il mistero delle proteine · coagulation of egg white by heat, the curdling of milk...
TRANSCRIPT
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Padova, 16 Ottobre 2007
IL MISTERO DELLEPROTEINEFlavioFlavio SenoSeno
Dipartimento di Fisica – Universita’di Padova
Istituto Nazionale Fisica Nucleare (INFN)
Consorzio Nazionale Interuniversitario per la Struttura della Materia (CNISM)
M5P SEMINARS
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Leo Slizard:“Physicist bring to biology not any skills acquired in physics, butrather an attitude: the convinction which few biologist have thatmysteries can be solved”
BiofisicaBiofisica : Applicazione di principi e metodi fisici per lo studio della strutturadegli organismi viventi e per la comprensione dei meccanismi vitali
FisicaFisica ee BiologiaBiologia
X-rays Diffraction of Lysozyme crystals obtained at -30°.
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FisicaFisica BiologicaBiologica ( Biologically motivated Physics)( Biologically motivated Physics)
ModelliModelli sonosono giocattoligiocattoli mentalimentali cheche possonopossono guidareguidare ilil nostronostromodomodo didi pensarepensare ee didi comprenderecomprendere
Molte delle principali scoperte in meccanica statistica derivano da semplificazioni chepotrebbero sembrare irrealistiche a prima vista: particelle rappresentate da sfereperfette con ogni dettaglio atomico dimenticato, trascurando la presenza di altreparticelle, momenti magnetici trattati come frecce ….
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PROTEINS
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�Proteins: why are so important?
�From the Greek: “Being of Primary Importance”
No better world could have been chosen !!!!!!
Enzymatic catalysis
Transport and Storage
Movement
Immunitary Defense
Transmission of nervous signals
Hormon activity
Forming tissues
Berzelius,1838
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Albuminoids: these materials were identified (1800) in natural processes as thecoagulation of egg white by heat, the curdling of milk with acid or the
spontaneous clotting of blood
Gerardus Mulder (1802-1880) proposed a molecular form: 12106240 ONHC
S+
Justus von Liebig(1803-1873):
We cannot isolate the particular substance described by Mr. Moulder. And so,it is a source of despair, after so much has been prattled and written about“protein”, to have to say there is no such thing.
Mulder again: 1285436 ONHC
Von Liebig (working with casein) purified to small molecules:
first amino-acids: leucine and tyrosine
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20 KIND OF AMINO-ACIDS
C COOHNH
H
R
2
Amino groupCarboxylic acid group
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Protein Structure
Carbon alpha, Carbon’, Nitrogen, Oxigen …. Hydrogen omitted
Alanine
Valine
Glycine
Serine
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Adenina
Guanina
Citosina
Uracile
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Integrin Cell Adhesion Protein
184 Aminoacids 1491 Atoms
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Integrin Cell Adhesion Protein
184 Aminoacids 1491 Atoms
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Integrin Cell Adhesion Protein
184 Aminoacids 1491 Atoms
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PROTEIN FOLDING
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The Protein Folding Problem• The native state is uniquely
determined by the sequence
• The native state isthermodynamically stableand reachable from differentstarting conditions.
• Only few sequences areproteins
• Only few conformationsare native states
• The folding time is veryrapid (0.01-100 sec)
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The Inverse Folding Problem• Given a desired structure to
find an aminoacid sequencethat folds on it
• Protein functionality iscontrolled by its nativeconformation
• Powerful DNA-recombinationtechniques allow to modifythe sequence of amino-acids
• To solve the problem wouldallow to design new proteinswith new functionality
(drug design)
?
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Protein folding is complex
• 20 type of amino acids with distinct sidechains
• huge number of degrees of freedom• polymer chain constraint (length 50-1000)• steric constraints (excluded volume)• role of the aqueous solvent• quantum chemistry
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Current level of computational resources rulesan all atoms model (protein+solvent)
Blue Gene:IBM challenge
Many results are corroborating the existence of a few , effective mechanisms which are the relevantones for the folding process:
•Many amino-acids sequences fold into the same structure•Hydrophobic effect as leading force for the folding
Physcists’ Challenge…
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Very interesting fact
~ 100.000 sequences exist and only~ 1.000 folds
� mapping many to one
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Compactness-Hydrophobicity
HH PP
SolventSolvent
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Connessioni con la Fisica Teorica
•Catene lineari: polimeri, fenomeni critici,modello O(n), universalitàgruppo di rinormalizzazione
•Dinamica: free energy landscape, modelli frustrati,vetri di spin, processi di ottimizzazione
•Simulazioni: Dinamica molecolare e Monte-Carlo,Enumerazioni esatte
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COARSE-GRAINEDMODELS
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Coarse grained representation
Too many details can obscure ,rather than illuminate physical principles
To consider just few degrees of freedom for each amino-acid (e.g. )αC
Effective interactions between these “amino-acids” are postulated toarise on integrating out the other degrees of freedom
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HP ModelOnly two kinds of aminoacids: H Hydrophobic
P Polar
Tk
E
B
1−
0
0
08−=E
2
1 3
45
66
77
8
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PROTEIN DESIGN
*C
Target
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PROTEIN DESIGN
Solution*S
5− 4−
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TEST N. 2TEST N. 2
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TEST N. 2TEST N. 2
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TEST N. 2TEST N. 2Right
Left
Forward
Backward
Up
Down
10/10 successes
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TEST N. 3TEST N. 3
3rn3
124 aa
74 %
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PRE-SCULPTED ENERGY
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Very interesting fact
Protein sequences have undergone evolutionbut folds have not…. they seem immutable
~ 100.000 sequences exist and only~ 1.000 folds
� mapping many to one
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Is it possibile to develop anunifying framework thatcan explain the stability ofthese Platonic folds?
Can we use this frameworkto understand more aboutproteins?
1 Step:
Which are the reallyimportant leading forces andrules that drive to these folds?
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Thick Homopolymers
• Chain directionality breaks rotational symmetry ofthe tethered objects.
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Optimal Helix
Pieranski
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-5 -4 -3 -2 -1 0 +1 +2 +3 +4
eW
4
3
2
1
0
eR
Ground State Phase Diagram
ew = water mediated hydrophobic interaction
No sequence specificity: HOMOPOLYMER
eR = curvature - Ramachandran
StructurelessCompact Swollen
?
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Ground State Phase Diagram
-5 -4 -3 -2 -1 0 +1 +2 +3 +4
eW
4
3
2
1
0
eR
SwollenStructurelessCompact
bend
ing
ener
gy
attraction energy
HOMOPOLYMER
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Ground State Phase Diagram
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All Minima In The Vicinity Of theSwollen Phase
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48 beads
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Alzheimer disease and hereditary cerebral hemmorhage with amylodosis.
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Conjectured Amyloid Fiber
Proteins tend to misfold and to aggregate(in several diseases, but not only)
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Single Chain versus multiple chains
…amyloid formation arises primarly from main chaininteractions (Fandrich-Dobson EMBO J. 21, 5892 (2002))
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Human amyloid beta-peptide 1-40 (Alzheimer disease)
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Qualche lettura:
1. E. Boncinelli, Prima lezione di biologia, Universale Laterza (2001)
2. C. Branden e J. Tooze, Introduzione alla struttura delle proteine, Zanichelli(1993)
3. M. Gross, Travels to the Nanoworld, Perseus Publishing (2001)
4. D. Dressler and H. Potter, Discovering enzymes, Scientific American Library(1991)
5. K. Huang, Statistical Physics and Protein Folding, World Scientific (2005)
6. A.R. Fersht, Structure and Mechanism in Protein Scienc: A guide to EnzymeCatalysis and Protein Folding, W.H. Freeman and Company (1999)
7. A.V. Finkelstein and O. Ptistyn, Protein physics: a course of lectures,Academic Press (2002)
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Fisica BiologicaProblemi fondamentali: universalità,interazioni competitive, proprietà
topologiche, ottimizzazione
Problemi applicativi con impatto bio-medico: disegno di nuovi farmaci,guida a terapie genetiche,prevenzione di malattie
Forte connessione quotidiana:Teoria-Esperimento
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Cosa studiare (Laurea Specialistica):PERCORSO DI FISICA BIOLOGICA
BiofisicaFondamenti di Biologia Cellulare e Biochimica
Laboratorio di ElettronicaMicroscopia Ottica – Fisica dei Sistemi Complessi
PERCORSO DI FISICA DELLA MATERIA
Complementari: Biofisica-Fondamenti-Microscopia Ottica (Sperimentale)Complementari: Fisica dei Sistemi Complessi-Biofisica-Fondamenti (Teorica)
PERCORSO TEORICO:
Complementari: Fisica dei Sistemi Complessi-Biofisica-Fondamenti (Teorica)
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Con chi lavorare (Fare la Tesi):Sensory and signal transductionin the inner ear (sperimentale)
Venetian Institute of Molecular Medicine (VIMM)-Via Orus
Theory (Dipartimento - CNISM )
Amos Maritan Flavio Seno Antonio Trovato
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