Abstract:
:The TCR structure of T cell hybridomas recognizing a tumor glycan-defined epitope has been studied using reverse transcriptase-PCR and gene sequencing. The hybridomas had been raised against a glycopeptide, T72(Tn), consisting of the mouse hemoglobin-derived decapeptide Hb(67 - 76), O-glycoslated in position 72 with alpha-D-GalNAc. The glycan-specific hybridomas varied widely in their use of Valpha genes although Valpha4 was predominant, being present in one third of them. The Vbeta gene usage was more restricted and dominated by Vbeta1 and Vbeta15. There was no correlation between Valpha and Vbeta usage and antigen fine specificity of the hybridomas. The overall amino acid composition of the complementarity-determining region (CDR) 3 of the hybridomas was dominated by small polar residues such as Gly, Asn, Ser, Glu and Ala, amino acids reported in the literature to be frequent in glycan-recognizing proteins. Furthermore, the CDR3 of most hybridomas also contained an aromatic residue with preference for Tyr. A few of the hybridomas raised against the T72(Tn) glycopeptide were peptide specific, i. e. they responded to the unglycosylated peptide only. The amino acid usage of their CDR3 regions was not radically different from that of the glycopeptide specific hybridomas. They also preferentially used Valpha4. However, Vbeta4 and Vbeta8 were the dominating beta chains.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Jensen T,Hansen P,Faurskov Nielsen A,Meldal M,Komba S,Werdelin Odoi
10.1002/(SICI)1521-4141(199909)29:09<2759::AID-IMMkeywords:
subject
Has Abstractpub_date
1999-09-01 00:00:00pages
2759-68issue
9eissn
0014-2980issn
1521-4141journal_volume
29pub_type
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