A novel dual-specificity protein kinase targeted to the chloroplast in tobacco.
The NtDSK1 cDNA encoding a novel chloroplast-targeted protein kinase was identified in Nicotiana tabacum. It contains the kinase domain at the C-terminus and a putative regulatory domain at the N-terminus. The recombinant NtDSK1 underwent autophosphorylation of serine, threonine, and tyrosine residues, indicating that NtDSK1 encodes a functional dual-specificity protein kinase. The NtDSK1-green fluorescent protein fusion protein was targeted to chloroplasts. Furthermore, the NtDSK1 protein was immunodetected in chloroplast fractions isolated from tobacco seedlings. The NtDSK1 mRNA expression was developmentally regulated in different tissues, including anthers and germinating seeds, and strongly stimulated by gibberellin. The mRNA was rapidly light responsive during seedling growth. NtDSK1 may play a role in a light-regulated signaling process in tobacco.
Cho
H S
HS
Plant Cell Biochemistry Labouratory, Korea Research Institute of Bioscience and Biotechnology, South Korea.
Yoon
G M
GM
Lee
S S
SS
Kim
Y A
YA
Hwang
I
I
Choi
D
D
Pai
H S
HS
D002736:Chloroplasts / Q000201:enzymology* / Q000528:radiation effects; D018076:DNA, Complementary / Q000235:genetics; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000528:radiation effects; D015698:Genomic Library; D005875:Gibberellins / Q000494:pharmacology; D008027:Light; D008969:Molecular Sequence Data; D010766:Phosphorylation; D018514:Plant Structures / Q000201:enzymology; D010947:Plants, Toxic; D011494:Protein Kinases / Q000235:genetics / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D011505:Protein-Tyrosine Kinases / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity / Q000502:physiology; D014026:Nicotiana / Q000201:enzymology*
D018076:DNA, Complementary; D005875:Gibberellins; D012333:RNA, Messenger; D011494:Protein Kinases; D011505:Protein-Tyrosine Kinases; D017346:Protein Serine-Threonine Kinases