1887

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Volume 75, Issue 11

T cell-stimulatory Fragments of Foot-and-mouth Disease Virus Released by Mild Treatment With Cathepsin D Free

Abstract

Cathepsin D and cathepsin B are endosomal/lysosomal proteases that are thought to play a role during antigen processing, releasing fragments for binding to major histocompatibility complex class II products and subsequent presentation to T cells. Here we treated purified foot-and-mouth disease virus (FMDV) strain AHolland with both enzymes. Cathepsin D, but not cathepsin B, was shown to release fragments from reduced or non-reduced FMDV under mild conditions . Twenty-eight predominant cathepsin D-released fragments were purified by HPLC and identified by amino acid composition analysis and sequencing. The unseparated set of fragments produced (the digest) was able to stimulate T cells from eight vaccinated cattle. With respect to the response to intact virus the extent of the response to the digest differed between animals: four animals could be classified as good responders, three as intermediate responders and one as a low responder. Subsequently, we investigated the proliferative T cell response to a large set of synthetic peptides in detail for two animals, one belonging to the group of good responders, the other being the low responder. The peptides covered all 28 cathepsin D-released fragments analysed and also several sequences not recovered from the digest. In this way seven T cell sites could be identified, five of which coincided with cathepsin D-released fragments. The other two T cell sites were VP2[54–72], being a homologue of a T cell site identified for FMDV strain OK and the N terminus of VP4. Whether the most dominantly recognized T cell site was recovered from the digest or not was shown to be related to the good or low response to the digest. These findings suggest a role for cathepsin D in the release of some but not all T cell-stimulatory fragments from FMDV.

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© The Journal of General Virology 1994
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1994-11-01
2024-04-25
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T cell-stimulatory Fragments of Foot-and-mouth Disease Virus Released by Mild Treatment With Cathepsin D
J. Gen. Virol. 75, 2937 (1994); https://doi.org/10.1099/0022-1317-75-11-2937
/content/journal/jgv/10.1099/0022-1317-75-11-2937
/content/journal/jgv/10.1099/0022-1317-75-11-2937
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