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2015 ; 1
(ä): 85-96
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Model structures of inactive and peptide agonist bound C5aR: Insights into
agonist binding, selectivity and activation
#MMPMID29124137
Rana S
; Sahoo AR
Biochem Biophys Rep
2015[May]; 1
(ä): 85-96
PMID29124137
show ga
C5a receptor (C5aR) is one of the major chemoattractant receptors of the
druggable proteome that binds C5a, the proinflammatory polypeptide of complement
cascade, triggering inflammation and SEPSIS. Here, we report the model structures
of C5aR in both inactive and peptide agonist (YSFKPMPLaR; a=D-Ala) bound
meta-active state. Assembled in CYANA and evolved over molecular dynamics (MD) in
POPC bilayer, the inactive C5aR demonstrates a topologically unique compact
heptahelical bundle topology harboring a ?-hairpin in extracellular loop 2
(ECL2), derived from the atomistic folding simulations. The peptide agonist bound
meta-active C5aR deciphers the "site2" at an atomistic resolution in the
extracellular surface (ECS), in contrast to the previously hypothesized
inter-helical crevice. With estimated Ki?2.75 ?M, the meta-active C5aR
excellently rationalizes the IC(50) (0.1-13 ?M) and EC(50) (0.01-6 ?M) values,
displayed by the peptide agonist in several signaling studies. Moreover, with
Ki?5.3×10(5) ?M, the "site2" also illustrates selectivity, by discriminating the
stereochemical mutant peptide (YSFkPMPLaR; k=D-Lys), known to be inert toward
C5aR, up to 1 mM concentration. Topologically juxtaposed between the structures
of rhodopsin and CXCR1, the C5aR models also display excellent structural
correlations with the other G-protein coupled receptors (GPCRs). The models
elaborated in the current study unravel many important structural insights
previously not known for regulating the agonist binding and activation mechanism
of C5aR.