Deregulated expression of KRAP, a novel gene encoding actin-interacting protein, in human colon cancer cells

Junichi Inokuchi, Misako Komiya, Iwai Baba, Seiji Naito, Takehiko Sasazuki, Senji Shirasawa

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

We have identified a novel gene, designated KRAP (Ki-ras-induced actin-interacting protein), encoding a protein of 1,259 amino acids with coiled-coil regions and transmembrane regions, from the cDNA library of human colon cancer HCT116 cells, as one of the genes upregulated by activated Ki-ras. While KRAP was rarely expressed in normal colon epithelium, deregulated constitutive KRAP expression was observed in some other colon cancer cells. In normal tissues, KRAP was strongly expressed in pancreas and testis. Anti-KRAP polyclonal antibodies detected endogenous KRAP as the molecular size of M r 180,000, and immunofluorescence microscopy and cytochalasin E treatment revealed that KRAP was clearly associated with the actin filaments. Furthermore, KRAP was localized as a membrane-bound form with extracellular regions. These results together suggested KRAP might be involved in the regulation of filamentous actin and signals from the outside of the cells.

Original languageEnglish
Pages (from-to)46-52
Number of pages7
JournalJournal of Human Genetics
Volume49
Issue number1
DOIs
Publication statusPublished - 2004

All Science Journal Classification (ASJC) codes

  • Genetics
  • Genetics(clinical)

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