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| M-LDH serves as a sarcolemmal K-ATP channel subunit essential for cell protection against ischemia |
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| Author(s): Crawford RM, Budas GR, Jovanovic S, Ranki HJ, Wilson TJ, Davies AM, Jovanovic A |
| Source: EMBO JOURNAL Volume: 21 Issue: 15 Pages: 3936-3948 Published: AUG 1 2002 |
| Times Cited: 50 References: 32 |
| Abstract: ATP-sensitive K+ (K-ATP) channels in the heart are normally closed by high intracellular ATP, but are activated during ischemia to promote cellular survival. These channels are heteromultimers composed of Kir6.2 subunit, an inwardly rectifying K+ channel core, and SUR2A, a regulatory subunit implicated in ligand-dependent regulation of channel gating. Here, we have shown that the muscle form (M-LDH), but not heart form (H-LDH), of lactate dehydrogenase is directly physically associated with the sarcolemmal K-ATP channel by interacting with the Kir6.2 subunit via its N-terminus and with the SUR2A subunit via its C-terminus. The species of LDH bound to the channel regulated the channel activity despite millimolar concentration of intracellular ATP. The presence of M-LDH in the channel protein complex was required for opening of K-ATP channels during ischemia and ischemia-resistant cellular phenotype. We conclude that M-LDH is an integral part of the sarcolemmal K-ATP channel protein complex in vivo, where, by virtue of its catalytic activity, it couples the metabolic status of the cell with the K-ATP channels activity that is essential for cell protection against ischemia. |
| Document Type: Article |
| Language: English |
| Reprint Address: Jovanovic, A (reprint author), Univ Dundee, Ninewells Hosp & Med Sch, Tayside Inst Child Hlth, Dundee DD1 9SY, Scotland |
Addresses:
1. Univ Dundee, Ninewells Hosp & Med Sch, Tayside Inst Child Hlth, Dundee DD1 9SY, Scotland
2. Univ Dundee, Sch Life Sci, Div Biol Chem & Mol Microbiol, Dundee DD1 4HN, Scotland |
| Publisher: OXFORD UNIV PRESS, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND |
| Subject Category: Biochemistry & Molecular Biology; Cell Biology |
| IDS Number: 584MQ |
| ISSN: 0261-4189 |
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| | | | | | | | | Record from Web of Science® | | | | | | | | | |