In meso structure of the membrane integral lipoprotein intramolecular transacylase Lit from Bacillus cereus in space group P21212

Experimental Data Snapshot

  • Resolution: 1.94 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.233 

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Structural basis of the membrane intramolecular transacylase reaction responsible for lyso-form lipoprotein synthesis.

Olatunji, S.Bowen, K.Huang, C.Y.Weichert, D.Singh, W.Tikhonova, I.G.Scanlan, E.M.Olieric, V.Caffrey, M.

(2021) Nat Commun 12: 4254-4254

  • DOI: https://doi.org/10.1038/s41467-021-24475-0
  • Primary Citation of Related Structures:  
    7B0O, 7B0P, 7B0Q, 7B0R

  • PubMed Abstract: 

    Lipoproteins serve diverse functions in the bacterial cell and some are essential for survival. Some lipoproteins are adjuvants eliciting responses from the innate immune system of the host. The growing list of membrane enzymes responsible for lipoprotein synthesis includes the recently discovered lipoprotein intramolecular transacylase, Lit. Lit creates a lipoprotein that is less immunogenic, possibly enabling the bacteria to gain a foothold in the host by stealth. Here, we report the crystal structure of the Lit enzyme from Bacillus cereus and describe its mechanism of action. Lit consists of four transmembrane helices with an extracellular cap. Conserved residues map to the cap-membrane interface. They include two catalytic histidines that function to effect unimolecular transacylation. The reaction involves acyl transfer from the sn-2 position of the glyceryl moiety to the amino group on the N-terminal cysteine of the substrate via an 8-membered ring intermediate. Transacylation takes place in a confined aromatic residue-rich environment that likely evolved to bring distant moieties on the substrate into proximity and proper orientation for catalysis.

  • Organizational Affiliation

    Membrane Structural and Functional Biology Group, School of Medicine and School of Biochemistry and Immunology, Trinity College Dublin, Dublin, Ireland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hypothetical Membrane Spanning Protein
A, B
237Bacillus cereus ATCC 14579Mutation(s): 0 
Gene Names: BC_1526
Membrane Entity: Yes 
Find proteins for Q813T3 (Bacillus cereus (strain ATCC 14579 / DSM 31 / CCUG 7414 / JCM 2152 / NBRC 15305 / NCIMB 9373 / NCTC 2599 / NRRL B-3711))
Explore Q813T3 
Go to UniProtKB:  Q813T3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ813T3
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
OLC (Subject of Investigation/LOI)
Query on OLC

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
Q [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
Q [auth A],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B]
(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate
C21 H40 O4
Query on PG5

Download Ideal Coordinates CCD File 
C8 H18 O4
Query on GOL

Download Ideal Coordinates CCD File 
AA [auth B]
BA [auth B]
CA [auth B]
G [auth A]
H [auth A]
AA [auth B],
BA [auth B],
CA [auth B],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
R [auth A],
Z [auth B]
C3 H8 O3
Experimental Data & Validation

Experimental Data

  • Resolution: 1.94 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.233 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.166α = 90
b = 192.235β = 90
c = 76.801γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
autoPROCdata processing

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Science Foundation IrelandIreland16/IA/4435

Revision History  (Full details and data files)

  • Version 1.0: 2021-05-26
    Type: Initial release
  • Version 1.1: 2021-07-28
    Changes: Database references
  • Version 1.2: 2024-01-31
    Changes: Data collection, Database references, Refinement description