3V8O

Human Filamin C Ig - like Domains 4 and 5

Summary for 3V8O

• Entry DOI: 10.2210/pdb3v8o/pdb
• Descriptor: Filamin-C, POTASSIUM ION (3 entities in total)
• Functional Keywords: immunoglobulin like fold, muscle z disk, structural protein
• Biological source: Homo sapiens (human)
• Cellular location: Cytoplasm: Q14315
• Total number of polymer chains: 2
• Total formula weight: 41249.50

Authors

Sethi, R.,Ylanne, J. (deposition date: 2011-12-23, release date: 2013-07-17, Last modification date: 2023-09-13)

Primary citation

Sethi, R.,Seppala, J.,Tossavainen, H.,Ylilauri, M.,Ruskamo, S.,Pentikainen, O.T.,Pentikainen, U.,Permi, P.,Ylanne, J.
A novel structural unit in the N-terminal region of filamins.
J.Biol.Chem., 289:8588-8598, 2014

PubMed Abstract: Immunoglobulin-like (Ig) domains are a widely expanded superfamily that act as interaction motifs or as structural spacers in multidomain proteins. Vertebrate filamins (FLNs), which are multifunctional actin-binding proteins, consist of 24 Ig domains. We have recently discovered that in the C-terminal rod 2 region of FLN, Ig domains interact with each other forming functional domain pairs, where the interaction with signaling and transmembrane proteins is mechanically regulated by weak actomyosin contraction forces. Here, we investigated if there are similar inter-domain interactions around domain 4 in the N-terminal rod 1 region of FLN. Protein crystal structures revealed a new type of domain organization between domains 3, 4, and 5. In this module, domains 4 and 5 interact rather tightly, whereas domain 3 has a partially flexible interface with domain 4. NMR peptide titration experiments showed that within the three-domain module, domain 4 is capable for interaction with a peptide derived from platelet glycoprotein Ib. Crystal structures of FLN domains 4 and 5 in complex with the peptide revealed a typical β sheet augmentation interaction observed for many FLN ligands. Domain 5 was found to stabilize domain 4, and this could provide a mechanism for the regulation of domain 4 interactions.

PubMed: 24469451
DOI: 10.1074/jbc.M113.537456

Experimental method

X-RAY DIFFRACTION (2.8 Å)