Inhibition of host proteasome antigen processing by virus

The proteasome plays an essential role in MHC class I antigen presentation pathway. The processing of foreign proteins leads to the presentation of viral peptides by MHC class I molecules to cytotoxic T lymphocytes.

TAT EBNA1

Several viruses have managed to avoid degradation by the proteasome using different tricks. Epstein-Barr virus EBNA-1(P03211) contains for example an internal repeat exclusively composed of glycines and alanines that inhibits proteasomal degradation. HIV TAT also acts at the transcriptional level by modifying proteasome composition by upregulating the LMP7(X62598:9606) and MECL1(Y13640:9606) subunits and downregulating the LMP2(X62741:9606) subunit, thereby promoting presentation of cryptic and subdominant CTL epitopes.

Matching UniProtKB/Swiss-Prot entries

6 entries grouped by protein (browse by keywords)

3 entries

Epstein-Barr nuclear antigen 1 (EBNA-1) (EBV nuclear antigen 1)

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EBNA1_EBVA8
Epstein-Barr virus (strain AG876) (HHV-4) (Human herpesvirus 4) reference strain
EBNA1_EBVB9
Epstein-Barr virus (strain B95-8) (HHV-4) (Human herpesvirus 4) reference strain
EBNA1_EBVG
Epstein-Barr virus (strain GD1) (HHV-4) (Human herpesvirus 4)

3 entries

Envelope glycoprotein (Env polyprotein)

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ENV_MLVF5
Friend murine leukemia virus (isolate 57) (FrMLV)
ENV_MLVFF
Friend murine leukemia virus (isolate FB29) (FrMLV)
ENV_MLVFP
Friend murine leukemia virus (isolate PVC-211) (FrMLV)