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- ***************************
- * DnaJ domains signatures *
- ***************************
-
- The prokaryotic heat shock protein dnaJ interacts with the chaperone hsp70-
- like dnaK protein [1]. Structurally, the dnaJ protein consists of an N-
- terminal conserved domain (called 'J' domain) of about 70 amino acids, a
- glycine-rich region ('G' domain') of about 30 residues, a central domain
- containing four repeats of a CXXCXGXG motif ('CRR' domain) and a C-terminal
- region of 120 to 170 residues. Such a structure is shown in the following
- schematic representation:
-
- +------------+-+-------+-----+-----------+--------------------------------+
- | N-terminal | | Gly-R | | CXXCXGXG | C-terminal |
- +------------+-+-------+-----+-----------+--------------------------------+
-
- It has been shown [2] that the 'J' domain as well as the 'CRR' domain are also
- found in other prokaryotic and eukaryotic proteins which are listed below.
-
- a) Proteins containing both a 'J' and a 'CRR' domain:
-
- - Yeast protein MAS5/YDJ1 which seems to be involved in mitochondrial protein
- import.
- - Yeast protein MDJ1, involved in mitochondrial biogenesis and protein
- folding.
- - Yeast protein SCJ1, involved in protein sorting.
- - Plants dnaJ homologs (from leek and cucumber).
- - Human HDJ2, a dnaJ homolog of unknown function.
-
- b) Proteins containing a 'J' domain without a 'CRR' domain:
-
- - Rhizobium fredii nolC, a protein involved in cultivar-specific nodulation
- of soybean.
- - Escherichia coli cbpA [3], a protein that binds curved DNA.
- - Yeast protein SEC63/NPL1, important for protein assembly into the
- endoplasmic reticulum and the nucleus.
- - Yeast protein SIS1, required for nuclear migration during mitosis.
- - Plasmodium falciparium ring-infected erythrocyte surface antigen (RESA).
- RESA, whose function is not known, is associated with the membrane skeleton
- of newly invaded erythrocytes.
- - Human HDJ1.
- - Human HSJ1, a neuronal protein.
-
- We developed a signature pattern for the 'J' domain, based on conserved
- positions in the C-terminal half of this domain. We also developed a pattern
- for the 'CRR' domain, based on the first two copies of that motif.
-
- -Consensus pattern: [FY]-x(2)-[LIVMA]-x(3)-[FYWH]-[DENQSA]-x-L-x-D-x(3)-[KR]-
- x(2)-[FY]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: budding yeast zuotin.
-
- -Consensus pattern: C-[DESTHK]-x-C-x-G-x-[GK]-[AGSM]-x(2)-[GNK]-x(4,5)-C-
- x(2,3)-C-x-G-x-G
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Expert(s) to contact by email: Kelley W.
- kelley@cmu.unige.ch
-
- -Last update: June 1994 / Patterns and text revised.
-
- [ 1] Cyr D.M., Langer T., Douglas M.G.
- Trends Biochem. Sci. 19:176-181(1994).
- [ 2] Bork P., Sander C., Valencia A., Bukau B.
- Trends Biochem. Sci. 17:129-129(1992).
- [ 3] Ueguchi C., Kaneda M., Yamada H., Mizuno T.
- Proc. Natl. Acad. Sci. U.S.A. 91:1054-1058(1994).
-