Linked Life Data

10913253

Source:http://linkedlifedata.com/resource/pubmed/id/10913253

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
29
pubmed:dateCreated
2000-8-15
pubmed:abstractText
Human myotonic dystrophy protein kinase (DMPK) is a member of a novel class of multidomain protein kinases that regulate cell size and shape in a variety of organisms. However, little is currently known about the general properties of DMPK including domain function, substrate specificity, and potential mechanisms of regulation. Two forms of the kinase are expressed in muscle, DMPK-1 and DMPK-2. We demonstrate that the larger DMPK-1 form (the primary translation product) is proteolytically cleaved near the carboxy terminus to generate the smaller DMPK-2 form. We further demonstrate that the coiled-coil domain is required for DMPK oligomerization; coiled-coil mediated oligomerization also correlated with enhanced catalytic activity. DMPK was found to exhibit a novel catalytic activity similar to, but distinct from, related protein kinases such as protein kinase C and A, and the Rho kinases. We observed that recombinant DMPK-1 exhibits low activity, whereas the activity of carboxy-terminally truncated DMPK is increased approximately 3-fold. The inhibitory activity of the full-length kinase was mapped to what appears to be a pseudosubstrate autoinhibitory domain at the extreme carboxy terminus of DMPK. To date, endogenous activators of DMPK are unknown; however, we observed that DMPK purified from cells exposed to the G protein activator GTP-gamma-S exhibited an approximately 2-fold increase in activity. These results suggest a general model of DMPK regulation with two main regulatory branches: short-term activation of the kinase in response to G protein second messengers and long-term activation as a result of proteolysis.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
39
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
8480-90
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Myotonic dystrophy protein kinase domains mediate localization, oligomerization, novel catalytic activity, and autoinhibition.
pubmed:affiliation
Division of Cardiology, Department of Medicine, University of Colorado Health Sciences Center, Denver 80262, USA.
pubmed:publicationType
Journal Article, In Vitro, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't