Smooth muscle myosin light chain kinase efficiently phosphorylates serine 15 of cardiac myosin regulatory light chain.
Smooth muscle myosin light chain kinase efficiently phosphorylates serine 15 of cardiac myosin regulatory light chain.
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DOI:
10.1016/j.bbrc.2011.11.044
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发表时间:
2011-12-16
影响因子:
3.1
通讯作者:
Ajtai K
中科院分区:
文献类型:
--
作者:
Josephson MP;Sikkink LA;Penheiter AR;Burghardt TP;Ajtai K
Specific phosphorylation of the human ventricular cardiac myosin regulatory light chain (MYL2) modifies the protein at S15. This modification affects MYL2 secondary structure and modulates the Ca2+ sensitivity of contraction in cardiac tissue. Smooth muscle myosin light chain kinase (smMLCK) is a ubiquitous kinase prevalent in uterus and present in other contracting tissues including cardiac muscle. The recombinant 130 kDa (short) smMLCK phosphorylated S15 in MYL2 in vitro. Specific modification of S15 was verified using the direct detection of the phospho group on S15 with mass spectrometry. SmMLCK also specifically phosphorylated myosin regulatory light chain S15 in porcine ventricular myosin and chicken gizzard smooth muscle myosin (S20 in smooth muscle) but failed to phosphorylate the myosin regulatory light chain in rabbit skeletal myosin. Phosphorylation kinetics, measured using a novel fluorescence method eliminating the use of radioactive isotopes, indicates similar Michaelis-Menten Vmax and KM for regulatory light chain S15 phosphorylation rates in MYL2, porcine ventricular myosin, and chicken gizzard myosin. These data demonstrate that smMLCK is a specific and efficient kinase for the in vitro phosphorylation of MYL2, cardiac, and smooth muscle myosin. Whether smMLCK plays a role in cardiac muscle regulation or response to a disease causing stimulus is unclear but it should be considered a potentially significant kinase in cardiac tissue on the basis of its specificity, kinetics, and tissue expression.
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影响因子:
3.7
作者:
Han YS;Ogut O
通讯作者:
Ogut O
影响因子:
3.9
作者:
Hong, Feng;Haldeman, Brian D.;Jackson, Del;Carter, Mike;Baker, Jonathan E.;Cremo, Christine R.
通讯作者:
Cremo, Christine R.
DOI:
10.2174/1568006033481474
发表时间:
2003-06-01
期刊:
Current Drug Targets - Cardiovascular & Haematological Disorders
影响因子:
--
作者:
Szczesna, Danuta
通讯作者:
Szczesna, Danuta
影响因子:
--
作者:
Dudnakova, T. V.;Stepanova, O. V.;Shirinsky, V. R.
通讯作者:
Shirinsky, V. R.
影响因子:
7
作者:
Olsen, JV;de Godoy, LMF;Mann, M
通讯作者:
Mann, M