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Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Biol+Chem 2014 ; 289 (21): 14731-9 Nephropedia Template TP
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Mg2+-dependent interactions of ATP with the cystathionine-beta-synthase (CBS) domains of a magnesium transporter #MMPMID24706765
Hirata Y; Funato Y; Takano Y; Miki H
J Biol Chem 2014[May]; 289 (21): 14731-9 PMID24706765show ga
Ancient conserved domain protein/cyclin M (CNNM) family proteins are evolutionarily conserved Mg(2+) transporters. However, their biochemical mechanism of action remains unknown. Here, we show the functional importance of the commonly conserved cystathionine-beta-synthase (CBS) domains and reveal their unique binding ability to ATP. Deletion mutants of CNNM2 and CNNM4, lacking the CBS domains, are unable to promote Mg(2+) efflux. Furthermore, the substitution of one amino acid residue in the CBS domains of CNNM2, which is associated with human hereditary hypomagnesemia, abrogates Mg(2+) efflux. Binding analyses reveal that the CBS domains of CNNM2 bind directly to ATP and not AMP in a manner dependent on the presence of Mg(2+), which is inhibited in a similar pattern by the disease-associated amino acid substitution. The requirement of Mg(2+) for these interactions is a unique feature among CBS domains, which can be explained by the presence of highly electronegative surface potentials around the ATP binding site on CNNM2. These results demonstrate that the CBS domains play essential roles in Mg(2+) efflux, probably through interactions with ATP. Interactions with ATP, which mostly forms complexes with Mg(2+) in cells, may account for the rapid Mg(2+) transport by CNNM family proteins.
|Adenosine Triphosphate/*metabolism[MESH]
|Amino Acid Sequence[MESH]
|Amino Acid Substitution[MESH]
|Animals[MESH]
|Binding Sites/genetics[MESH]
|Blotting, Western[MESH]
|Cation Transport Proteins/chemistry/genetics/*metabolism[MESH]