Crystal structure of syndesmos and its interaction with Syndecan-4 proteoglycan

Heeyoun Kim, Jiho Yoo, Inhwan Lee, Ying Jin Kang, Hyun Soo Cho, Weontae Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Syndesmos, nucleoside diphosphate linked moiety X (nudix)-type motif 16-like 1 (Nudt16l1), is evolutionarily divergent from the Nudt16 family. Syndesmos, which is co-localized with syndecan-4 cytoplasmic domain (Syn4cyto) in focal contacts, interacts with various cell adhesion adaptor proteins to control cell signaling. We determined the X-ray crystal structure of syndesmos; it is composed of seven α-helices and seven β-strands. Although syndesmos has a molecular topology similar to that of nudix hydrolase proteins, the structure of the nudix motif differs from that of X29. The dimeric interface of syndesmos is composed of α-helix 4, 7 and β-strand 2, 7, which primarily form hydrophobic interactions. The binding interaction between syndesmos and syn4cyto was characterized as a low-affinity interaction (Kd = 62 μM) by surface plasmon resonance (SPR) and nuclear magnetic resonance (NMR). The NMR resonances of Lys (177, 178, 179), Gly182, and Ser183 in the C1 region and Lys193 and Lys194 in the V region of syndecan-4 are perturbed upon syndesmos binding. Our results provide structural insight into the molecular function of syndesmos in the regulation of cell signaling via binding to syndecan-4.

Original languageEnglish
Pages (from-to)762-767
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume463
Issue number4
DOIs
Publication statusPublished - 2015 Jul 13

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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