The E5 protein of BPV-4 interacts with the heavy chain of MHC class I and irreversibly retains the MHC complex in the Golgi apparatus.

Abstract:

:BPV-4 E5 inhibits transcription of the bovine MHC class I heavy chain (HC) gene, increases degradation of HC and downregulates surface expression of MHC class I by retaining the complex in the Golgi apparatus (GA). Here we report that transcription inhibition can be alleviated by interferon treatment and the degradation of HC can be reversed by treatment with inhibitors of proteasomes and lysosomes. However, the inhibition of transport of MHC class I to the cell surface is irreversible. We show that E5 is capable of physically interacting with HC. Together with the inhibition of the vacuolar ATPase (due to the interaction between E5 and 16k subunit c), the interaction between E5 and HC is likely to be responsible for retention of MHC class I in the GA. C-terminus deletion mutants of E5 are incapable of either downregulating surface MHC class I or interacting with HC, establishing that the C-terminus domain of E5 is important in the inhibition of MHC class I.

journal_name

Oncogene

journal_title

Oncogene

authors

Marchetti B,Ashrafi GH,Dornan ES,Araibi EH,Ellis SA,Campo MS

doi

10.1038/sj.onc.1209245

subject

Has Abstract

pub_date

2006-04-06 00:00:00

pages

2254-63

issue

15

eissn

0950-9232

issn

1476-5594

pii

1209245

journal_volume

25

pub_type

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