Linked Life Data

11418599

Source:http://linkedlifedata.com/resource/pubmed/id/11418599

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
33
pubmed:dateCreated
2001-8-13
pubmed:databankReference
pubmed:abstractText
We previously identified testicular protein kinase 1 (TESK1), which phosphorylates cofilin and induces actin cytoskeletal reorganization. We now report identification and characterization of another member of a TESK family, testicular protein kinase 2 (TESK2), with 48% amino acid identity with TESK1. Like TESK1, TESK2 phosphorylated cofilin specifically at Ser-3 and induced formation of actin stress fibers and focal adhesions. Both TESK1 and TESK2 are highly expressed in the testis, but in contrast to TESK1, which is predominantly expressed in testicular germ cells, TESK2 is expressed predominantly in nongerminal Sertoli cells. Thus, TESK1 and TESK2 seem to play distinct roles in spermatogenesis. In HeLa cells, TESK1 was localized mainly in the cytoplasm, whereas TESK2 was localized mainly in the nucleus, which means that TESK1 and TESK2 likely have distinct cellular functions. Because the kinase-inactive mutant of TESK2 was localized in the cytoplasm, nuclear/cytoplasmic localization of TESK2 depends on its kinase activity. A TESK2 mutant lacking the C-terminal noncatalytic region had about a 10-fold higher kinase activity in vitro and, when expressed in HeLa cells, induced punctate actin aggregates in the cytoplasm and unusual condensation and fragmentation of nuclei, followed by apoptosis. Thus, we propose that the C-terminal region plays important roles in regulating the kinase activity and cellular functions of TESK2.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
17
pubmed:volume
276
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
31449-58
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed-meshheading:11418599-Actin Depolymerizing Factors, pubmed-meshheading:11418599-Actins, pubmed-meshheading:11418599-Amino Acid Sequence, pubmed-meshheading:11418599-Animals, pubmed-meshheading:11418599-Base Sequence, pubmed-meshheading:11418599-Cell Line, pubmed-meshheading:11418599-DNA, Complementary, pubmed-meshheading:11418599-Humans, pubmed-meshheading:11418599-Immunohistochemistry, pubmed-meshheading:11418599-Intracellular Signaling Peptides and Proteins, pubmed-meshheading:11418599-Male, pubmed-meshheading:11418599-Microfilament Proteins, pubmed-meshheading:11418599-Molecular Sequence Data, pubmed-meshheading:11418599-Phosphorylation, pubmed-meshheading:11418599-Protein-Serine-Threonine Kinases, pubmed-meshheading:11418599-RNA, Messenger, pubmed-meshheading:11418599-Rats, pubmed-meshheading:11418599-Sertoli Cells
pubmed:year
2001
pubmed:articleTitle
Cofilin phosphorylation and actin reorganization activities of testicular protein kinase 2 and its predominant expression in testicular Sertoli cells.
pubmed:affiliation
Department of Biomolecular Sciences, Graduate School of Life Sciences, Tohoku University, Sendai 980-8578, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't