7ANK

Crystal structure of sarcomeric protein FATZ-1 (d91-FATZ-1 construct) in complex with half dimer of alpha-actinin-2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.256 

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Literature

Order from disorder in the sarcomere: FATZ forms a fuzzy but tight complex and phase-separated condensates with alpha-actinin.

Sponga, A.Arolas, J.L.Schwarz, T.C.Jeffries, C.M.Rodriguez Chamorro, A.Kostan, J.Ghisleni, A.Drepper, F.Polyansky, A.De Almeida Ribeiro, E.Pedron, M.Zawadzka-Kazimierczuk, A.Mlynek, G.Peterbauer, T.Doto, P.Schreiner, C.Hollerl, E.Mateos, B.Geist, L.Faulkner, G.Kozminski, W.Svergun, D.I.Warscheid, B.Zagrovic, B.Gautel, M.Konrat, R.Djinovic-Carugo, K.

(2021) Sci Adv 7

  • DOI: 10.1126/sciadv.abg7653
  • Primary Citation of Related Structures:  
    7A8U, 7A8T, 7ANK

  • PubMed Abstract: 
  • In sarcomeres, α-actinin cross-links actin filaments and anchors them to the Z-disk. FATZ (filamin-, α-actinin-, and telethonin-binding protein of the Z-disk) proteins interact with α-actinin and other core Z-disk proteins, contributing to myofibril assembly and maintenance ...

    In sarcomeres, α-actinin cross-links actin filaments and anchors them to the Z-disk. FATZ (filamin-, α-actinin-, and telethonin-binding protein of the Z-disk) proteins interact with α-actinin and other core Z-disk proteins, contributing to myofibril assembly and maintenance. Here, we report the first structure and its cellular validation of α-actinin-2 in complex with a Z-disk partner, FATZ-1, which is best described as a conformational ensemble. We show that FATZ-1 forms a tight fuzzy complex with α-actinin-2 and propose an interaction mechanism via main molecular recognition elements and secondary binding sites. The obtained integrative model reveals a polar architecture of the complex which, in combination with FATZ-1 multivalent scaffold function, might organize interaction partners and stabilize α-actinin-2 preferential orientation in Z-disk. Last, we uncover FATZ-1 ability to phase-separate and form biomolecular condensates with α-actinin-2, raising the question whether FATZ proteins can create an interaction hub for Z-disk proteins through membraneless compartmentalization during myofibrillogenesis.


    Organizational Affiliation

    Department of Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Alpha-actinin-2A535Homo sapiensMutation(s): 0 
Gene Names: ACTN2
UniProt & NIH Common Fund Data Resources
Find proteins for P35609 (Homo sapiens)
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Go to UniProtKB:  P35609
PHAROS:  P35609
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Alpha-actinin-2B389Homo sapiensMutation(s): 0 
Gene Names: ACTN2
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Find proteins for P35609 (Homo sapiens)
Explore P35609 
Go to UniProtKB:  P35609
PHAROS:  P35609
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Myozenin-1C209Homo sapiensMutation(s): 0 
Gene Names: MYOZ1MYOZ
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Find proteins for Q9NP98 (Homo sapiens)
Explore Q9NP98 
Go to UniProtKB:  Q9NP98
PHAROS:  Q9NP98
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.256 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.6α = 90
b = 56.92β = 94.56
c = 209.38γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European CommissionMarie Sklodowska-Curie Actions, ITN 238423
Austrian Science FundAustriaI525, I1593, P22276, P19060 and W1221
Christian Doppler ForschungsgesellschaftAustriaLaboratory for High-Content Structural Biology and Biotechnology
Wellcome TrustUnited Kingdom201543/Z/16
European CommissionAustrian-Slovak Interreg Project B301
Vienna Science and Technology Fund (WWTF)AustriaChemical Biology project LS17-008
Research Platform ComammoxAustria--

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-30
    Type: Initial release