A visual intracellular classification strategy for uncharacterized human proteins

Mary Rose Hoja, Claes Wahlestedt, Christer Höög

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The human cDNA and genomic sequencing projects will result in the identification and isolation of some 140,000 genes, the majority of which lack predicted functions and for which the cellular localizations are not known. The identification and characterization of protein components of specific cell structures and machineries are essential steps not only toward defining functions of genes but also toward understanding cell function and regulation. We describe here a new approach, termed PROLOC, which uses full-length cDNAs for systematic classification of novel proteins as a functional pointer. We have PCR-amplified 25 uncharacterized human genes and expressed the encoded proteins as GFP fusions in a human cell line. This pilot project has identified novel proteins associated with the nucleolus, mitochondria, the ER, the ER-Golgi-intermediate compartment (ERGIC), the GC, the plasma membrane, and cytoplasmic foci. This visual classification approach may be scaled up to handle a large number of novel genes and permit the generation of a global cellular protein localization map. Such information should be valuable for many aspects of functional genomics and cell biology. (C) 2000 Academic Press.

Original languageEnglish (US)
Pages (from-to)239-246
Number of pages8
JournalExperimental Cell Research
Issue number1
StatePublished - Aug 25 2000
Externally publishedYes


  • GFP
  • Novel genes
  • Protein localization

ASJC Scopus subject areas

  • Cell Biology


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