Abstract:
:The major histocompatibility complex (MHC) class I region of humans, chimpanzees (Pan troglodytes), and bonobos (Pan paniscus) is highly similar, and orthologues of HLA-A, -B, and -C are present in both Pan species. Based on functional characteristics, the different HLA-A allotypes are classified into different supertypes. One of them, the HLA A03 supertype, is widely distributed among different human populations. All contemporary known chimpanzee and bonobo MHC class I A allotypes cluster genetically into one of the six HLA-A families, the HLA-A1/A3/A11/A30 family. We report here that the peptide-binding motif of the Patr-A*05:01 allotype, which is commonly present in a cohort of western African chimpanzees, has a strong preference for binding peptides with basic amino acids at the carboxyl terminus. This phenomenon is shared with the family members of the HLA A03 supertype. Based on the chemical similarities in the peptide-binding pocket, we inferred that the preference for binding peptides with basic amino acids at the carboxyl terminus is widely present among the human, chimpanzee, and bonobo MHC-A allotypes. Subsequent in silico peptide-binding predictions illustrated that these allotypes have the capacity to target conserved parts of the proteome of human immunodeficiency virus type 1 (HIV-1) and the simian immunodeficiency virus SIVcpz.IMPORTANCE Most experimentally infected chimpanzees seem to control an HIV-1 infection and are therefore considered to be relatively resistant to developing AIDS. Contemporary free-ranging chimpanzees may carry SIVcpz, and there is evidence for AIDS-like symptoms in these free-ranging animals, whereas SIV infections in bonobos appear to be absent. In humans, the natural control of an HIV-1 infection is strongly associated with the presence of particular HLA class I allotypes. The ancestor of the contemporary living chimpanzees and bonobos survived a selective sweep targeting the MHC class I repertoire. We have put forward a hypothesis that this may have been caused by an ancestral retroviral infection similar to SIVcpz. Characterization of the relevant MHC allotypes may contribute to understanding the shaping of their immune repertoire. The abundant presence of MHC-A allotypes that prefer peptides with basic amino acids at the C termini suggests that these molecules may contribute to the control of retroviral infections in humans, chimpanzees, and bonobos.
journal_name
J Viroljournal_title
Journal of virologyauthors
de Groot NG,Heijmans CMC,de Ru AH,Otting N,Koning F,van Veelen PA,Bontrop REdoi
10.1128/JVI.01960-19subject
Has Abstractpub_date
2020-04-16 00:00:00issue
9eissn
0022-538Xissn
1098-5514pii
JVI.01960-19journal_volume
94pub_type
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