Domain

I/LWEQ domain (IPR002558)

Short name: ILWEQ_dom

Domain relationships

None.

Description

The I/LWEQ domain is a ~250-residue actin-binding module that is found in the C termini of functionally diverse proteins from yeast to mammals. The I/LWEQ domain contains four conserved blocks and has been named after the conserved initial residues of blocks 1-4. The I/LWEQ domain is generally found near the C terminus and in association with other domains, such as FERM or ENTH. The I/LWEQ domain has been shown to bind to F-actin and to bundle actin filaments [PMID: 9159132, PMID: 10581178, PMID: 16415883].

The I/LWEQ domain contains a proteolysis resistant-core that has an all-alpha-helical structure composed of five long down-up-down-up-down antiparallelhelices connected by short loops and one short connecting alpha helix arranged in a progressive topology. The proteolysis-resistant core is followed by a C-terminal latch region that adopts an alpha-helical conformation. The latch region can mediate oligomerization of I/LWEQ domains, possibly as dimers, and this seems to enhance the F-actin-binding ability of the proteolysis-resistant core [PMID: 16415883].

It's worth noting that the I/LWEQ domain has also been called the talin-HIP1/R/Slap2p actin- tethering C-terminal homology (THATCH) domain (HIP1/R/Slap2p denotes similarity of Slap2p to HIP1 and HIP1R) [PMID: 6415883].

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

GO:0003779 actin binding

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
SMART
Pfam
PROSITE profiles
ProDom