Crystal structure of SpaE basal pilin from Lactobacillus rhamnosus GG - Selenium derivative

Experimental Data Snapshot

  • Resolution: 1.71 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 

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Crystal structure of basal pilin SpaE reveals the molecular basis of its incorporation in the lactobacillar SpaFED pilus.

Megta, A.K.Mishra, A.K.Palva, A.von Ossowski, I.Krishnan, V.

(2019) J Struct Biol 207: 74-84

  • DOI: https://doi.org/10.1016/j.jsb.2019.04.016
  • Primary Citation of Related Structures:  
    6JBV, 6JCH, 6JK7

  • PubMed Abstract: 

    For some Gram-positive genera and species, the long-extended and adhesive sortase-dependent pilus plays an essential role during host colonization, biofilm formation, and immune modulation. Lactobacillus rhamnosus GG is a gut-adapted commensal strain that harbors the operonic genes for the SpaCBA and SpaFED pili, both being comprised of three different protein subunits termed the backbone, tip, and basal pilins. Crystal structures of the backbone pilins (SpaA and SpaD) have recently been solved, and here we describe the high-resolution (1.5 Å) structural determination of the SpaE basal pilin. SpaE consists of two immunoglobulin-like CnaB domains, with each displaying a spontaneously formed internal isopeptide bond, though apparently slow forming in the N-terminal domain. Remarkably, SpaE contains an atypically lengthy unstructured C-terminal tail, along with an YPKN pilin motif peptide, which is normally reserved for backbone subunits. Based on our analysis of the crystal structure data, we provide a molecular model for the basal positioning of the SpaE pilin within the SpaFED pilus.

  • Organizational Affiliation

    Laboratory of Structural Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, Faridabad, Haryana 121 001, India; School of Biotechnology, KIIT University, Odisha 751024, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pilus assembly protein400Lacticaseibacillus rhamnosus GGMutation(s): 0 
Gene Names: DU507_12320
Find proteins for A0A5H1ZR38 (Lacticaseibacillus rhamnosus (strain ATCC 53103 / LMG 18243 / GG))
Explore A0A5H1ZR38 
Go to UniProtKB:  A0A5H1ZR38
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A5H1ZR38
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
Experimental Data & Validation

Experimental Data

  • Resolution: 1.71 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.779α = 90
b = 63.936β = 90
c = 131.112γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Department of Biotechnology (India)IndiaBT/PR5891/BRB/10/1098/2012

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-26
    Type: Initial release
  • Version 1.1: 2021-09-15
    Changes: Advisory, Database references, Derived calculations