6IWG

Crystal structure of rhesus macaque MHC class I molecule Mamu-B*05104 complexed with N-myristoylated 4-mer lipopeptide derived from SIV nef protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.179 

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Literature

Identification and Structure of an MHC Class I-Encoded Protein with the Potential to PresentN-Myristoylated 4-mer Peptides to T Cells.

Yamamoto, Y.Morita, D.Shima, Y.Midorikawa, A.Mizutani, T.Suzuki, J.Mori, N.Shiina, T.Inoko, H.Tanaka, Y.Mikami, B.Sugita, M.

(2019) J Immunol 202: 3349-3358

  • DOI: 10.4049/jimmunol.1900087
  • Primary Citation of Related Structures:  
    6IWG, 6IWH

  • PubMed Abstract: 
  • Similar to host proteins, N -myristoylation occurs for viral proteins to dictate their pathological function. However, this lipid-modifying reaction creates a novel class of "lipopeptide" Ags targeted by host CTLs. The primate MHC class I-enc ...

    Similar to host proteins, N -myristoylation occurs for viral proteins to dictate their pathological function. However, this lipid-modifying reaction creates a novel class of "lipopeptide" Ags targeted by host CTLs. The primate MHC class I-encoded protein, Mamu-B*098, was previously shown to bind N -myristoylated 5-mer peptides. Nevertheless, T cells exist that recognize even shorter lipopeptides, and much remains to be elucidated concerning the molecular mechanisms of lipopeptide presentation. We, in this study, demonstrate that the MHC class I allele, Mamu-B*05104, binds the N -myristoylated 4-mer peptide (C14-Gly-Gly-Ala-Ile) derived from the viral Nef protein for its presentation to CTLs. A phylogenetic tree analysis indicates that these classical MHC class I alleles are not closely associated; however, the high-resolution x-ray crystallographic analyses indicate that both molecules share lipid-binding structures defined by the exceptionally large, hydrophobic B pocket to accommodate the acylated glycine (G1) as an anchor. The C-terminal isoleucine (I4) of C14-Gly-Gly-Ala-Ile anchors at the F pocket, which is distinct from that of Mamu-B*098 and is virtually identical to that of the peptide-presenting MHC class I molecule, HLA-B51. The two central amino acid residues (G2 and A3) are only exposed externally for recognition by T cells, and the methyl side chain on A3 constitutes a major T cell epitope, underscoring that the epitopic diversity is highly limited for lipopeptides as compared with that for MHC class I-presented long peptides. These structural features suggest that lipopeptide-presenting MHC class I alleles comprise a distinct MHC class I subset that mediates an alternative pathway for CTL activation.


    Organizational Affiliation

    Laboratory of Cell Regulation and Molecular Network, Graduate School of Biostudies, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MHC class I antigenA276Macaca mulattaMutation(s): 4 
Gene Names: Mamu-B*05104Mamu-BB
Find proteins for B2ZHY7 (Macaca mulatta)
Explore B2ZHY7 
Go to UniProtKB:  B2ZHY7
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB100Macaca mulattaMutation(s): 0 
Gene Names: B2M
Find proteins for Q6V7J5 (Macaca mulatta)
Explore Q6V7J5 
Go to UniProtKB:  Q6V7J5
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
N-myristoylated 4-mer lipopeptideC5Simian immunodeficiency virusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

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A, B
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
BO3
Query on BO3

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A, B
BORIC ACID
B H3 O3
KGBXLFKZBHKPEV-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.823α = 90
b = 81.756β = 90
c = 106.635γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data collection
HKL-2000data reduction
PHENIXrefinement
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japan Society for the Promotion of ScienceJapan16K19151
Japan Society for the Promotion of ScienceJapan15J04072
Japan Agency for Medical Research and Development (AMED)Japan16K15517
Japan Society for the Promotion of ScienceJapan17H05791

Revision History 

  • Version 1.0: 2019-08-14
    Type: Initial release