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(Received for publication, July 23, 1996, and in revised form, February 6, 1997)
,
,
,
From the We report the identification and characterization
of Dnrk (Drosophila neurospecific
receptor kinase), a Drosophila gene
encoding a putative receptor tyrosine kinase (RTK) highly related to
the Trk and Ror families of RTKs. During Drosophila
embryogenesis, the Dnrk gene is expressed specifically in
the developing nervous system. The Dnrk protein possesses two conserved
cysteine-containing domains and a kringle domain within its
extracellular domain, resembling those observed in Ror family RTKs
(Ror1, Ror2, and a Drosophila Ror, Dror). This protein
contains the catalytic tyrosine kinase (TK) domain with two putative
ATP-binding motifs, resembling those observed in another
Drosophila RTK (Dtrk) that mediates homophilic cell
adhesion. The TK domain of Dnrk, expressed in bacteria or mammalian
cells, exhibits apparent autophosphorylation activities in
vitro. The TK domain lacking the distal ATP-binding motif also
exhibits autophosphorylation activity, yet to a lesser extent. In
addition to its TK activity, there are several putative tyrosine-containing motifs that upon phosphorylation may interact with
Src homology 2 regions of other signaling molecules. Collectively, these results suggest that Dnrk may play an important role in neural
development during Drosophila embryogenesis.
Department of Biochemistry, Kobe University
School of Medicine, 7-5-1, Kusunoki-chou, Chuo-Ku, Kobe 650, Japan and
§ Division of Biological Science, Graduate School of
Science, Nagoya University, Nagoya 464-01, Japan
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