Position 156 influences the peptide repertoire and tapasin dependency of human leukocyte antigen B*44 allotypes.

Abstract:

BACKGROUND:Polymorphic differences between donor and recipient human leukocyte antigen class I molecules can result in graft-versus-host disease due to distinct peptide presentation. As part of the peptide-loading complex, tapasin plays an important role in selecting peptides from the pool of potential ligands. Class I polymorphisms can significantly alter the tapasin-mediated interaction with the peptide-loading complex and although most class I allotypes are highly dependent upon tapasin, some are able to load peptides independently of tapasin. Several human leukocyte antigen B*44 allotypes differ exclusively at position 156 (B*44:02(156Asp), 44:03(156Leu), 44:28(156Arg), 44:35(156Glu)). From these alleles, only the high tapasin-dependency of human leukocyte antigen B*44:02 has been reported. DESIGN AND METHODS:We investigated the influence of position 156 polymorphisms on both the requirement of tapasin for efficient surface expression of each allotype and their peptide features. Genes encoding human leukocyte antigen B*44 variants bearing all possible substitutions at position 156 were lentivirally transduced into human leukocyte antigen class I-negative LCL 721.221 cells and the tapasin-deficient cell line LCL 721.220. RESULTS:Exclusively human leukocyte antigen B*44:28(156Arg) was expressed on the surface of tapasin-deficient cells, suggesting that the remaining B*44/156 variants are highly tapasin-dependent. Our computational analysis suggests that the tapasin-independence of human leukocyte antigen B*44:28(156Arg) is a result of stabilization of the peptide binding region and generation of a more peptide receptive state. Sequencing of peptides eluted from human leukocyte antigen B*44 molecules by liquid chromatography-electrospray ionization-mass spectrometry (LTQ-Orbitrap) demonstrated that both B*44:02 and B*44:28 share the same overall peptide motif and a certain percentage of their individual peptide repertoires in the presence and/or absence of tapasin. CONCLUSIONS:Here we report for the first time the influence of position 156 on the human leukocyte antigen/tapasin association. Additionally, the results of peptide sequencing suggest that tapasin chaperoning is needed to acquire peptides of unusual length.

journal_name

Haematologica

journal_title

Haematologica

authors

Badrinath S,Saunders P,Huyton T,Aufderbeck S,Hiller O,Blasczyk R,Bade-Doeding C

doi

10.3324/haematol.2011.046037

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

98-106

issue

1

eissn

0390-6078

issn

1592-8721

pii

haematol.2011.046037

journal_volume

97

pub_type

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