Myoglobin 137-148 MHC II DRB1*03:01 is a short part of Myoglobin. Myoglobin is a protein which binds oxygen or also iron in the skeletal muscle tissue.
Myoglobin 137-148 MHC II DRB1*03:01
Myoglobin 137-148 MHC II DRB1*03:01 is a classical peptide reference for the binding with MHC II DRB1*03:01. Myoglobin 137-148 is often used to be in competition for study of the relative binding affinity.
Peptide binding to class II MHC protein is commonly viewed as a combination of discrete anchor residue preferences for pockets 1,4,6/7,and 9. However,previous studies have suggested cooperative effects during the peptide binding process. Investigation of the DRB1*0901 binding motif demonstrated a clear interaction between peptide binding pockets 6 and 9. In agreement with prior studies,pockets 1 and 4 exhibited clear binding preferences. Previously uncharacterized pockets 6 and 7 accommodated a wide variety of residues. However,although it was previously reported that pocket 9 is completely permissive,several substitutions at this position were unable to bind. Structural modeling revealed a probable interaction between pockets 6 and 9 through beta9Lys. Additional binding studies with doubly substituted peptides confirmed that the amino acid bound within pocket 6 profoundly influences the binding preferences for pocket 9 of DRB1*0901,causing complete permissiveness of pocket 9 when a small polar residue is anchored in pocket 6 but accepting relatively few residues when a basic residue is anchored in pocket 6. The beta9Lys residue is unique to DR9 alleles. However,similar studies with doubly substituted peptides confirmed an analogous interaction effect for DRA1/B1*0301,a beta9Glu allele. Accounting for this interaction resulted in improved epitope prediction. These findings provide a structural explanation for observations that an amino acid in one pocket can influence binding elsewhere in the MHC class II peptide binding groove.
2- James E A et al. J Immunol. 186(11):6633-40 (2011)
Recurrent respiratory papillomatosis (RRP) is caused by human papillomavirus type 6 (HPV-6) or HPV-11. Specific HLA-DR haplotypes DRB1*01:02 and DRB1*03:01 are associated with the development of RRP,disease severity,and Th2-like responses to HPV early proteins. Th1-like responses to HPV proteins have been shown to be protective in animal models. Therefore,we investigated the hypothesis that RRP patients have dysfunctional Th1-like,HPV-specific T cell responses. Using MHC class II tetramers,we identified immunogenic peptides within HPV-11 early proteins. Two distinct peptides (E6(113-132) and E2(1-20)) contained DRB1*01:02- or DRB1*03:01-restricted epitopes,respectively. An additional peptide (E2(281-300)) contained an epitope presented by both alleles. Peptide binding,tetramer,and proliferation assays identified minimal epitopes within these peptides. These epitopes elicited E2/E6-specific CD4(+) T cell responses in RRP patients and healthy control subjects,allowing the isolation of HPV-specific T cell lines using tetramers. The cytokine profiles and STAT signaling of these tetramer-positive T cells were measured to compare the polarization and responsiveness of HPV-specific T cells from patients with RRP and healthy subjects. HPV-specific IFN-γ secretion was substantially lower in T cells from RRP patients. HPV-specific IL-13 secretion was seen at modest levels in T cells from RRP patients and was absent in T cells from healthy control subjects. HPV-specific T cells from RRP patients exhibited reduced STAT-5 phosphorylation and reduced IL-2 secretion,suggesting anergy. Levels of STAT-5 phosphorylation and IFN-γ secretion could be improved through addition of IL-2 to HPV-specific T cell lines from RRP patients. Therapeutic vaccination or interventions aimed at restoring Th1-like cytokine responses to HPV proteins and reversing anergy could improve clinical outcomes for RRP patients.
3- Salvat R,Moise L,Bailey-Kellogg C and Griswold K E. J Vis Exp. (85):51308 (2014)
Biochemical assays with recombinant human MHC II molecules can provide rapid,quantitative insights into immunogenic epitope identification,deletion,or design(1 ,2). Here,a peptide-MHC II binding assay is scaled to 384-well format. The scaled down protocol reduces reagent costs by 75% and is higher throughput than previously described 96-well protocols(1 ,3-5). Specifically,the experimental design permits robust and reproducible analysis of up to 15 peptides against one MHC II allele per 384-well ELISA plate. Using a single liquid handling robot,this method allows one researcher to analyze approximately ninety test peptides in triplicate over a range of eight concentrations and four MHC II allele types in less than 48 hr. Others working in the fields of protein deimmunization or vaccine design and development may find the protocol to be useful in facilitating their own work. In particular,the step-by-step instructions and the visual format of JoVE should allow other users to quickly and easily establish this methodology in their own labs.
4- Stone B et al. Clinical Immunology. 145(2):153-160 (2012)
Therapies capable of generating host T regulatory cells (TR) responsive to donor-specific HLA-class II minor histocompatibility antigens have the potential to promote tolerance of a transplanted organ. Our group has developed a novel approach for the identification of potentially therapeutic TR target antigens. We perform parallel non-synonymous SNP genotyping of HLA-identical subject pairs to identify peptide variations expressed by only one of the two subjects. Variant peptide pairs are then evaluated for binding a shared HLA-class II allele. Minor peptides predicted to bind HLA-class II with greater affinity than the common variant peptide are tested for HLA class II binding and in vitro induction of suppressive CD4+ T cells. Using this approach we have identified multiple pairs of variant peptides capable of differential binding and induction of suppressive CD4+ T cells. These data demonstrate the feasibility of identifying potentially therapeutic HLA class II minor antigens for generation of donor-specific TR.
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