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J Gen Virol 85 (2004), 1427-1431; DOI 10.1099/vir.0.79844-0

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© 2004 Society for General Microbiology

Short Communication

Identification of membrane proteins differentially expressed in human papillomavirus type 16 E5-transfected human keratinocytes by nanoelectrospray ionization mass spectrometry

Kerstin Leykauf, Mojiborahman Salek, Holger Schlüter, Wolf-Dieter Lehmann and Angel Alonso

Deutsches Krebsforschungszentrum, Im Neuenheimer Feld 242, 69120 Heidelberg, Germany

Correspondence
Angel Alonso
A.Alonso{at}dkfz.de

Membrane proteins differentially expressed in human papillomavirus type 16 (HPV-16) E5-transfected HaCaT cells have been identified. Membrane proteins were isolated and separated by two-dimensional gel electrophoresis. Spots showing quantitative differences between E5-transfected and control cells were extracted and the proteins were identified by nanoelectrospray ionization mass spectrometry. A total of 24 spots was analysed. Among the proteins showing differential expression, a decreased amount of calnexin and increased expression of hsp70, proteins both involved in maturation and transport of MHC class I complexes to the plasma membrane, were noticed. These findings correlate with the decreased surface expression of MHC class I molecules described in E5-expressing cells, HPV-positive cervical lesions and cervical carcinomas. These results stress the value of the proteomic approach, as used here in the experimental design, which allows the correlation of changes in host gene expression with biological functions of viral genes.






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