Recettori accoppiati a proteine G: analisi struttura/funzione di mutazioni patogenetiche
- 5 Anni 2002/2007
- 450.862€ Totale Fondi
L'attività di ogni cellula del corpo umano é praticamente regolata dall'attivazione di diverse classi di recettori proteici allocati o ancorati alla membrana cellulare. La maggior parte di questi recettori appartiene alla superfamiglia dei recettori accoppiati alle proteine-G, i quali, secondo stime correnti, costituiscono circa l'1% dei geni presenti nel genoma dei mammiferi. Un crescente numero di malattie umane è associato ad una impropria o errata regolazione della funzione svolta da questi recettori.
Lo studio è centrato su tre sottofamiglie a) i recettori adrenergici, b) i recettori delle gonadotropine, e c) il recettore della vasopressina.
L'approccio utilizzato integra tecniche e metodologie di chimica e biologia computazionale e bioinformatica con esperimenti di mutagenesi, biofisici e biochimici.
I principali obiettivi sono: a) ottenere sufficienti informazioni, a livello molecolare, per la progettazione razionale di nuovi farmaci e la ingegnerizzazione di molecole con potenzialità curative in terapia genica e, b) elaborare modelli molecolari in grado di prevedere l'effetto funzionale di mutazioni recettoriali.
Le tre linee di questo progetto convergeranno in deduzioni di ampia rilevanza e, verosimilmente, saranno estendibili ad altri recettori della stessa famiglia.
I modelli ed i protocolli di simulazione computazionale connessi, una volta ottimizzati e validati sperimentalmente, verranno messi a disposizione della comunità scientifica.
Pubblicazioni Scientifiche
- 2003 ASSAY AND DRUG DEVELOPMENT TECHNOLOGIES
Constitutively active G protein-coupled receptor mutants: Implications on receptor function and drug action
- 2002 ENDOCRINE
Structural aspects of luteinizing hormone receptor - Information from molecular modeling and mutagenesis
- 2007 JOURNAL OF BIOLOGICAL CHEMISTRY
Intrinsic differences in the response of the human lutropin receptor versus the human follitropin receptor to activating mutations
- 2005 BIOCHEMISTRY
Rhodopsin activation follows precoupling with transducin: Inferences from computational analysis
- 2002 MOLECULAR PHARMACOLOGY
Mutagenesis and modelling of the alpha(1b)-adrenergic receptor highlight the role of the helix 3/helix 6 interface in receptor activation
- 2004 JOURNAL OF MEDICINAL CHEMISTRY
Synthesis, screening, and molecular modeling of new potent and selective antagonists at the alpha(1d) adrenergic receptor
- 2007 MOLECULAR AND CELLULAR ENDOCRINOLOGY
Dimerization of the lutropin receptor: Insights from computational modeling
- 2005 ANNALS OF THE NEW YORK ACADEMY OF SCIENCES
Structure-function relationships of the luteinizing hormone receptor
- 2003 JOURNAL OF BIOLOGICAL CHEMISTRY
Adenosine A(2A)-dopamine D2 receptor-receptor heteromerization - Qualitative and quantitative assessment by fluorescence and bioluminescence energy transfer
- 2002 JOURNAL OF RECEPTOR AND SIGNAL TRANSDUCTION RESEARCH
The alpha(1b)-adrenergic receptor subtype: Molecular properties and physiological implications
- 2006 BMC BIOINFORMATICS
Quaternary structure predictions of transmembrane proteins starting from the monomer: A docking-based approach
- 2006 BIOPHYSICAL JOURNAL
Sequential unfolding of individual helices of bacterioopsin observed in molecular dynamics simulations of extraction from the purple membrane
- 2006 JOURNAL OF STRUCTURAL BIOLOGY
Prediction of MEF2A-DNA interface by rigid body docking: A tool for fast estimation of protein mutational effects on DNA binding
- 2008 ENDOCRINOLOGY
An intracellular loop (IL2) residue confers different basal constitutive activities to the human lutropin receptor and human thyrotropin receptor through structural communication between IL2 and helix 6, via helix 3
- 2008 MOLECULAR ENDOCRINOLOGY
Contributions of intracellular loops 2 and 3 of the lutropin receptor in gs coupling
- 2004 PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS
Structural features of the inactive and active states of the melanin-concentrating hormone receptors: Insights from molecular simulations
- 2005 JOURNAL OF BIOLOGICAL CHEMISTRY
Different structural requirements for the constitutive and the agonist-induced activities of the beta(2)-adrenergic receptor
- 2005 Journal of Chemical Information and Modeling
Probing fragment complementation by rigid-body docking: in silico reconstitution of calbindin D9k
- 2003 JOURNAL OF CHEMICAL INFORMATION AND COMPUTER SCIENCES
Molecular dynamics simulations of the ligand-induced chemical information transfer in the 5-HT1A receptor
- 2002 JOURNAL OF BIOLOGICAL CHEMISTRY
A model for constitutive lutropin receptor activation based on molecular simulation and engineered mutations in transmembrane helices 6 and 7
- 2004 MOLECULAR ENDOCRINOLOGY
Insight into mutation-induced activation of the luteinizing hormone receptor: Molecular simulations predict the functional behavior of engineered mutants at M398
- 2008 FEBS LETTERS
Dark and photoactivated rhodopsin share common binding modes to transducin
- 2004 BIOLOGY OF THE CELL
Structural determinants involved in the activation and regulation of G protein-coupled receptors: lessons from the alpha1-adrenegic receptor subtypes
- 2005 JOURNAL OF BIOLOGICAL CHEMISTRY
The formation of a salt bridge between helices 3 and 6 is responsible for the constitutive activity and lack of hormone responsiveness of the naturally occurring L457R mutation of the human lutropin receptor
- 2007 MOLECULAR AND CELLULAR ENDOCRINOLOGY
A functional transmembrane complex: The luteinizing hormone receptor with bound ligand and G protein
- 2005 BIOCHEMISTRY
The DRY motif as a molecular switch of the human oxytocin receptor
- 2008 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Mechanisms of inter- and intramolecular communication in GPCRs and g proteins
- 2005 CHEMICAL REVIEWS
Computational Modeling approaches to structure-function analysis of G protein-coupled receptors