Insights into the regulation of the ryanodine receptor: differential effects of Mg2+ and Ca2+ on ATP binding.
Calcium ions are frequently used second messengers in most living organisms. Members of the family of ryanodine sensitive calcium channels (ryanodine receptors, RyRs) are responsible for many important Ca(2+) signaling events in both excitable and nonexcitable cells. The biological activity of these membrane proteins is modulated and regulated by a great variety of different cellular and extracellular effectors, proteins, and small molecules. However, very little is still understood about how the modulators work on a molecular level. The very large size of more than 2 million Da per functional tetrameric RyR unit and its membrane association have made more detailed biochemical and structural analysis extremely challenging.
Dias
José M
JM
Department of Biological Sciences, Southern Methodist University, 6501 Airline Road, Dallas, Texas 75275, USA.
Szegedi
Csaba
C
Jóna
Istvan
I
Vogel
Pia D
PD
D000255:Adenosine Triphosphate / Q000031:analogs & derivatives / Q000737:chemistry / Q000378:metabolism*; D000818:Animals; D002118:Calcium / Q000737:chemistry / Q000378:metabolism*; D002413:Cations, Divalent / Q000737:chemistry / Q000378:metabolism; D008274:Magnesium / Q000737:chemistry / Q000378:metabolism*; D011817:Rabbits; D019837:Ryanodine Receptor Calcium Release Channel / Q000737:chemistry / Q000378:metabolism*
D002413:Cations, Divalent; D019837:Ryanodine Receptor Calcium Release Channel; C026652:3'-O-(1-oxyl-2,2,5,5-tetramethyl-3-carbonyl pyrrolidine)-adenosine 5'-triphosphate; D000255:Adenosine Triphosphate; D008274:Magnesium; D002118:Calcium