Uematsu S, Goto Y, Suzuki T, Sasazawa Y, Dohmae N, Simizu S. N-Glycosylation of extracellular matrix protein 1 (ECM1) regulates its secretion, which is unrelated to lipoid proteinosis.
FEBS Open Bio 2014;
4:879-85. [PMID:
25379385 PMCID:
PMC4215116 DOI:
10.1016/j.fob.2014.10.004]
[Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Revised: 10/06/2014] [Accepted: 10/06/2014] [Indexed: 11/21/2022] Open
Abstract
Extracellular matrix protein 1 (ECM1) plays roles in extracellular matrix formation.
Two ECM1 gene mutations observed in lipoid proteinosis patients suppress its secretion.
ECM1 is N-glycosylated at Asn354 and Asn444 residues.
N-linked glycan at Asn354 negatively regulated secretion of ECM1.
Extracellular matrix protein 1 (ECM1) is expressed in a wide variety of tissues and plays important roles in extracellular matrix formation. Additionally, ECM1 gene mutations cause lipoid proteinosis (LP), a rare skin condition of genetic origin. However, an effective therapeutic approach of LP is not established. Here, we showed that ECM1 gene mutation observed in LP patients significantly suppresses its secretion. As ECM1 has three putative N-glycosylation sites and most of mutated ECM1 observed in LP patients are defective in these N-glycosylation sites, we investigated the correlation between LP and N-glycosylation of ECM1. We identified that the Asn354 and Asn444 residues in ECM1 were N-glycosylated by mass spectrometry analysis. In addition, an N-linked glycan at Asn354 negatively regulated secretion of ECM1, contrary to LP patient-derived mutants. These results indicate that the defect of N-glycosylation in ECM1 is not involved in the aberration of secretion of LP-derived mutated ECM1.
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