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Abstract
Receptor activity modifying proteins (RAMPs) are a family of single-pass transmembrane proteins that dimerize with G-protein-coupled receptors. They may alter the ligand recognition properties of the receptors ( particularly for the calcitonin receptor-like receptor, CLR). Very little structural information is available about RAMPs. Here, an ab initio model has been generated for the extracellular domain of RAMP1. The disulfide bond arrangement (Cys(27)-Cys(82), Cys(40)-Cys(72), and Cys(57)-Cys (104)) was determined by site-directed mutagenesis. The secondary structure (alpha-helices from residues 29-51, 60-80, and 87-100) was established from a consensus of predictive routines. Using these constraints, an assemblage of 25,000 structures was constructed and these were ranked using an all-atom statistical potential. The best 1000 conformations were energy minimized. The lowest scoring model was refined by molecular dynamics simulation. To validate our strategy, the same methods were applied to three proteins of known structure; PDB:1HP8, PDB:1V54 chain H (residues 21-85), and PDB:1T0P. When compared to the crystal structures, the models had root mean-square deviations of 3.8 angstrom, 4.1 angstrom, and 4.0 angstrom, respectively. The model of RAMP1 suggested that Phe(93), Tyr(100), and Phe(101) form a binding interface for CLR, whereas Trp(74) and Phe(92) may interact with ligands that bind to the CLR/RAMP1 heterodimer.
Original language | English |
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Pages (from-to) | 662-669 |
Number of pages | 8 |
Journal | Biophysical Journal |
Volume | 91 |
DOIs | |
Publication status | Published - 21 Apr 2006 |
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Dive into the research topics of 'Characterization of the structure of RAMP1 by mutagenesis and molecular modeling'. Together they form a unique fingerprint.Projects
- 1 Finished
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Structural Analysis of RAMPs and their Role in CGRP Binding
Wheatley, M.
Biotechnology & Biological Sciences Research Council
1/01/04 → 31/12/06
Project: Research Councils