Ojha, H. and Ghosh, P. and Singh Panwar , H. and Shende, R. and Gondane, A. and Mande, S.C. and Sahu, A. (2019) Spatially conserved motifs in complement control protein domains determinefunctionality in regulators of complement activation-family proteins. Communications Biology..

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Abstract

Regulation of complement activation in the host cells is mediated primarily by the regulators of complement activation (RCA) family proteins that are formed by tandemly repeating complement control protein (CCP) domains. Functional annotation of these proteins, however, is challenging as contiguous CCP domains are found in proteins with varied functions. Here, by employing an in silico approach, we identify five motifs which are conserved spatially in a specific order in the regulatory CCP domains of known RCA proteins. We report that the presence of these motifs in a specific pattern is sufficient to annotate regulatory domains in RCA proteins. We show that incorporation of the lost motif in the fourth long-homologous repeat (LHR-D) in complement receptor 1 regains its regulatory activity. Additionally, the motif pattern also helped annotate human polydom as a complement regulator. Thus, we propose that the motifs identified here are the determinants of functionality in RCA proteins.

Item Type:	Article
Depositing User:	Mr. Rameshwar Nema
Date Deposited:	21 Feb 2020 09:01
Last Modified:	08 Dec 2021 11:03
URI:	http://nccs.sciencecentral.in/id/eprint/743

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