Molecular cloning and functional expression of the mouse gap junction gene connexin-57 in human HeLa cells

Dieter Manthey, Feliksas Bukauskas, Chun G. Lee, Christine A. Kozak, Klaus Willecke

Research output: Contribution to journalArticle

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Abstract

A new mouse connexin gene has been isolated that codes for a connexin protein of 505 amino acid residues. Based on the predicted molecular mass of 57.115 kDa, it has been designated connexin-57. Similar to most other mouse connexin genes, the coding region of connexin-57 is not interrupted by introns and exists in the mouse genome as a single-copy gene. Within the connexin family, this new gene shows highest sequence identity to porcine connexin-60 in the α group of connexins. The connexin-57 gene was mapped to a position on mouse chromosome 4, 30 centimorgans proximal to a cluster of previously mapped connexin genes. Low levels of connexin-57 mRNA were detected in skin, heart, kidney, testis, ovary, intestine, and in the mouse embryo after 8 days post coitum, but expression was not detected in brain, sciatic nerve or liver. In order to analyze gene function, the connexin-57 coding region was expressed by transfection in human HeLa cells, where it restored homotypic intercellular transfer of microinjected neurobiotin. Heterotypic transfer was observed between HeLa connexin-57 transfectants and HeLa cells, expressing murine connexin-43, -37, or -30.3. Double whole-cell voltage clamp analyses revealed that HeLa-connexin-57 transfectants expressed about 10 times more channels than parental HeLa cells. Voltage gating by transjunctional and transmembrane voltages as well as unitary conductance (~27 picosiemens) were different from intrinsic connexin channels in parental HeLa cells.

Original languageEnglish (US)
Pages (from-to)14716-14723
Number of pages8
JournalJournal of Biological Chemistry
Volume274
Issue number21
DOIs
StatePublished - May 21 1999

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Connexins
Cloning
Gap Junctions
Molecular Cloning
HeLa Cells
Genes
Electric potential
Connexin 43
Chromosomes, Human, Pair 4
Clamping devices
Molecular mass
Sciatic Nerve
Chromosomes
Liver
Introns

ASJC Scopus subject areas

  • Biochemistry

Cite this

Molecular cloning and functional expression of the mouse gap junction gene connexin-57 in human HeLa cells. / Manthey, Dieter; Bukauskas, Feliksas; Lee, Chun G.; Kozak, Christine A.; Willecke, Klaus.

In: Journal of Biological Chemistry, Vol. 274, No. 21, 21.05.1999, p. 14716-14723.

Research output: Contribution to journalArticle

Manthey, Dieter ; Bukauskas, Feliksas ; Lee, Chun G. ; Kozak, Christine A. ; Willecke, Klaus. / Molecular cloning and functional expression of the mouse gap junction gene connexin-57 in human HeLa cells. In: Journal of Biological Chemistry. 1999 ; Vol. 274, No. 21. pp. 14716-14723.
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