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Binding affinity of full-length and extracellular domains of recombinant human (pro)renin receptor to human renin when expressed in the fat body and hemolymph of silkworm larvae

Paper ID Volume ID Publish Year Pages File Format Full-Text
21691 43235 2009 6 PDF Available
Title
Binding affinity of full-length and extracellular domains of recombinant human (pro)renin receptor to human renin when expressed in the fat body and hemolymph of silkworm larvae
Abstract

Transmembrane domains of some receptors have been found to be very important in the process of constitutive oligomerization, and in the stability and functioning of the receptor. In this study, full-length of human (pro)renin receptor (hPRR) and hPRR lacking cytoplasmic domain (hPRR-ΔCD) were expressed in fat body of silkworm larvae, and the extracellular domain of hPRR (hPRR-ΔTMΔCD) in hemolymph. Three forms of hPRR were used for investigation of the interaction between receptor and ligand using surface plasmon resonance (SPR). As a result, the cytoplasmic domain was not an essential requirement for binding affinity, but the transmembrane domain of hPRR was indispensable in the formation of functional hPRR. The dissociation equilibrium constants (KD) of purified hPRR and hPRR-ΔCD were estimated to be 46 nM and 330 nM, respectively. No evidence of binding by the extracellular domain of hPRR located in hemolymph was found. However, the solubilized microsomal fraction of the extracellular domain of hPRR expressed in the fat body showed specific affinity, but lost its binding affinity after purification. Its binding affinity was recovered by mixing microsomal fraction of mock-injected fat body to the purified extracellular domain. It is probable that an artificial transmembrane domain stabilizes the extracellular domain of hPRR and native conformation may be structurally recovered. To our knowledge, these are the first findings describing the interaction of transmembrane and extracellular domains of hPRR with ligand and this may help towards the understanding of binding affinity of hPRR to ligand.

Keywords
Human (pro)renin receptor; Binding affinity; Surface plasmon resonance; Bacmid; BmNPV; Silkworm larvae
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Binding affinity of full-length and extracellular domains of recombinant human (pro)renin receptor to human renin when expressed in the fat body and hemolymph of silkworm larvae
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 108, Issue 4, October 2009, Pages 304–309
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us