Human erythrocyte dematin and protein 4.2 (pallidin) are ATP binding proteins

Biochemistry
A C AzimA H Chishti

Abstract

Dematin and protein 4.2 are peripheral membrane proteins associated with the cytoplasmic surface of the human erythrocyte plasma membrane. Isoforms of dematin and protein 4.2 exist in many nonerythroid cells. In solution, dematin is a trimeric protein containing two subunits of 48 kDa and one subunit of 52 kDa. Recent determination of the primary structure of the 52 kDa subunit of dematin showed that it contains an additional 22-amino acid sequence in the headpiece domain. An alignment of the 22-amino acid insertion sequence revealed that the 52 kDa subunit of dematin shares a novel 11-amino acid motif with protein 4.2. In this communication, we report that the conserved 11-amino acid motif in dematin52 and protein 4.2 contains a nucleotide binding P-loop. Direct binding of ATP is demonstrated to the glutathione S-transferase fusion proteins containing corresponding segments of dematin52 and protein 4.2 as well as to purified protein 4.2. The binding of ATP to the recombinant domains of dematin52 and protein 4.2 is specific, saturable, and of high affinity. The nucleotide specificity of the P-loop is restricted to ATP since no detectable binding was observed with GTP. These results show that the 11-amino acid motif provides an ...Continue Reading

Citations

Jul 10, 1998·Biochimica Et Biophysica Acta·A C KimA H Chishti
May 16, 2002·Proceedings of the National Academy of Sciences of the United States of America·Richie KhannaAthar H Chishti
Mar 10, 2009·Blood Cells, Molecules & Diseases·Timothy J SatchwellAshley M Toye
Dec 6, 1996·The Journal of Biological Chemistry·T S LaiC S Greenberg

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