PDBsum entry 5ejq

Motor protein

PDB id: 5ejq

Contents

Protein chain

498 a.a.

Ligands

GLY

SER

GLU

Waters ×512

PDB id:

5ejq

Name:

Motor protein

Title:

Structure of dictyostelium discoideum myosin vii myth4-ferm mf1 domain, mutant 2

Structure:

Myosin-i heavy chain. Chain: a. Synonym: class vii unconventional myosin,ddmvii,ddm7. Engineered: yes. Mutation: yes

Source:

Dictyostelium discoideum. Slime mold. Organism_taxid: 44689. Gene: myoi, ddb_g0274455. Expressed in: escherichia coli bl21. Expression_system_taxid: 511693. Expression_system_variant: ai

Resolution:

2.19Å R-factor: 0.187 R-free: 0.217

Authors:

V.J.Planelles-Herrero,H.Sirkia,Y.Sourigues,M.A.Titus,A.Houdusse

Key ref:

V.J.Planelles-Herrero et al. (2016). Myosin MyTH4-FERM structures highlight important principles of convergent evolution. Proc Natl Acad Sci U S A, 113, E2906. PubMed id: 27166421 DOI: 10.1073/pnas.1600736113

Date:

02-Nov-15 Release date: 06-Jul-16

Protein chain

Q9U1M8  (MYOI_DICDI) -  Myosin-I heavy chain from Dictyostelium discoideum

Seq: 2357 a.a.

Struc: 498 a.a.*

* PDB and UniProt seqs differ at 10 residue positions (black crosses)

DOI no: 10.1073/pnas.1600736113

Proc Natl Acad Sci U S A 113:E2906 (2016)

PubMed id: 27166421

Myosin MyTH4-FERM structures highlight important principles of convergent evolution.

V.J.Planelles-Herrero, F.Blanc, S.Sirigu, H.Sirkia, J.Clause, Y.Sourigues, D.O.Johnsrud, B.Amigues, M.Cecchini, S.P.Gilbert, A.Houdusse, M.A.Titus.

ABSTRACT

Myosins containing MyTH4-FERM (myosin tail homology 4-band 4.1, ezrin, radixin, moesin, or MF) domains in their tails are found in a wide range of phylogenetically divergent organisms, such as humans and the social amoeba Dictyostelium (Dd). Interestingly, evolutionarily distant MF myosins have similar roles in the extension of actin-filled membrane protrusions such as filopodia and bind to microtubules (MT), suggesting that the core functions of these MF myosins have been highly conserved over evolution. The structures of two DdMyo7 signature MF domains have been determined and comparison with mammalian MF structures reveals that characteristic features of MF domains are conserved. However, across millions of years of evolution conserved class-specific insertions are seen to alter the surfaces and the orientation of subdomains with respect to each other, likely resulting in new sites for binding partners. The MyTH4 domains of Myo10 and DdMyo7 bind to MT with micromolar affinity but, surprisingly, their MT binding sites are on opposite surfaces of the MyTH4 domain. The structural analysis in combination with comparison of diverse MF myosin sequences provides evidence that myosin tail domain features can be maintained without strict conservation of motifs. The results illustrate how tuning of existing features can give rise to new structures while preserving the general properties necessary for myosin tails. Thus, tinkering with the MF domain enables it to serve as a multifunctional platform for cooperative recruitment of various partners, allowing common properties such as autoinhibition of the motor and microtubule binding to arise through convergent evolution.