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Volume 272, Number 35, Issue of August 29, 1997 pp. 21982-21988
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Rem Is a New Member of the Rad- and Gem/Kir Ras-related GTP-binding Protein Family Repressed by Lipopolysaccharide Stimulation

(Received for publication, March 14, 1997, and in revised form, May 28, 1997)

From the Department of Biochemistry, University of Kentucky College of Medicine, Lexington, Kentucky 40536-0084

We report the cDNA cloning and characterization of a novel GTP-binding protein, termed Rem (for Rad and Gem-related), that was identified as a product of polymerase chain reaction amplification using oligonucleotide primers derived from conserved regions of the Rad, Gem, and Kir Ras subfamily. Alignment of the full-length open reading frame of mouse Rem revealed the encoded protein to be 47% identical to the Rad, Gem, and Kir proteins. The distinct structural features of the Rad, Gem, and Kir subfamily are maintained including a series of nonconservative amino acid substitutions at positions important for GTPase activity and a unique sequence motif thought to direct membrane association. Recombinant Rem binds GTP in a specific and saturable manner. Ribonuclease protection analysis found Rem to be expressed at comparatively high levels in cardiac muscle and at moderate levels in lung, skeletal muscle, and kidney. The administration of lipopolysaccharide to mice, a potent activator of the inflammatory and immune systems, results in the general repression of Rem mRNA levels in a dose- and time-dependent manner. Thus, Rem is the first Ras-related gene whose mRNA levels have been shown to be regulated by repression.

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