Summary

This strain contains 20 protein-level mutations:

  • 6 mutations in Spike protein: L5F, HV 69-70 deletion, T95I, D614G, T859N, D950H
  • 2 mutations in N protein: T205I, M234I
  • 2 mutations in NS3 protein: P42L, Q57H
  • 2 mutations in NS8 protein: T11I, A51S
  • 1 mutation in NS9c protein: L52F
  • 1 mutation in NSP2 protein: T85I
  • 3 mutations in NSP4 protein: K399E, L438P, A446V
  • 2 mutations in NSP6 protein: SGF 106-108 deletion, V278I
  • 1 mutation in NSP12 protein: P323L

We identified all possible linear viral peptides affected by these mutations. Whenever it was possible, we matched the reference peptide with the mutated one. For example, D -> L mutation transformed SDNGPQNQR to SLNGPQNQR. Cases when it was not meaningful included deletions and insertions at the flanks of the peptide, e.g., HV deletion in NVTWFHAIHV peptide.

Then, we predicted binding affinities between the selected peptides and frequent HLA alleles. Predictions were made with NetMHCpan-4.1 and NetMHCIIpan-4.0. The binding affinities were classifies into three groups:

  1. Tight binding (IC50 affinity ≤ 50 nM)
  2. Moderate binding (50 nM < IC50 affinity ≤ 500 nM)
  3. Weak/no binding (IC50 affinity > 500 nM)

Here we report HLA-peptide interactions whose affinity was altered by at least two folds. Note that mutations with empty set of altered interactions are not showed.

The total number of interactions between HLA-B*57:01 and peptides affected by the mutations

Weaker binding was found for 3 epitopes, while stronger binding was found for 1 entrie. There are 62 tight binders for the HLA-B*57:01 in the reference immunopeptidome (IC50 affinity ≤ 50 nM); 0 of them became non-tight binders (0.0%) and 0 novel tight binders appeared (0.0%). To avoid possible divisions by zero, we used + 1 regularization term in denominators when calculating percentages.

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HLA-B*57:01

Spike protein

T95I

Reference  VSGTNGTKRFDNPVLPFNDGVYFASTEKSNIIRGWIFGTTLDSKTQSLLIV
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Mutated    ‑SGTNGTKRFDNPVLPFNDGVYFASIEKSNIIRGWIFGTTLDSKTQSLLIV

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Allele Reference peptide Mutated peptide Reference affinity (IC50, nM) Mutated affinity (IC50, nM)
HLA-B*57:01 STEKSNIIRGW SIEKSNIIRGW 135 2014

NS3 protein

P42L

Reference  QGEIKDATPSDFVRATATIPIQASLPFGWLIVGVALLAVFQSASKIITLKK
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Mutated    QGEIKDATPSDFVRATATIPIQASLLFGWLIVGVALLAVFHSASKIITLKK

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Allele Reference peptide Mutated peptide Reference affinity (IC50, nM) Mutated affinity (IC50, nM)
HLA-B*57:01 ASLPFGWLI ASLLFGWLI 116 1279
HLA-B*57:01 QASLPFGWLI QASLLFGWLI 222 889
HLA-B*57:01 ATIPIQASLPF ATIPIQASLLF 369 169