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- ********************************
- * CBF/NF-Y subunits signatures *
- ********************************
-
- Diverse DNA binding proteins are known to bind the CCAAT box, a common cis-
- acting element found in the promoter and enhancer regions of a large number of
- genes in eukaryotes. Amongst these proteins is one known as the CCAAT-binding
- factor (CBF) or NF-Y [1]. CBF is a heteromeric transcription factor that
- consists of two different components both needed for DNA-binding.
-
- The HAP protein complex of yeast binds to the upstream activation site of
- cytochrome C iso-1 gene (CYC1) as well as other genes involved in
- mitochondrial electron transport and activates their expression. It also
- recognizes the sequence CCAAT and is structurally and evolutionary related to
- CBF.
-
- The first subunit of CBF, known as CBF-A or NF-YB in vertebrates, HAP3 in
- budding yeast and as PHP3 in fission yeast, is a protein of 116 to 210 amino-
- acid residues which contains a highly conserved central domain of about 90
- residues. This domain seems to be involved in DNA-binding; we have developed a
- signature pattern from its central part.
-
- The second subunit of CBF, known as CBF-B or NF-YA in vertebrates, HAP2 in
- budding yeast and PHP2 in fission yeast, is a protein of 265 to 350 amino-acid
- residues which contains a highly conserved region of about 60 residues. This
- region, called the 'essential core' [2], seems to consist of two subdomains:
- an N-terminal subunit-association domain and a C-terminal DNA recognition
- domain. We have developed a signature pattern from a section of the subunit-
- association domain.
-
- -Consensus pattern: C-V-S-E-x-I-S-F-[LIVM]-T-[SG]-E-A-S-[DE]-[KRQ]-C
- -Sequences known to belong to this class detected by the pattern: ALL CBF-A
- subunits.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: Y-V-N-A-K-Q-Y-x-R-I-L-K-R-R-x-A-R-A-K-L-E
- -Sequences known to belong to this class detected by the pattern: ALL CBF-B
- subunits.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: June 1994 / Patterns and text revised.
-
- [ 1] Li X.-Y., Mantovani R., Hooft van Huijsduijnen R., Andre I., Benoist C.,
- Mathis D.
- Nucleic Acids Res. 20:1087-1091(1992).
- [ 2] Olesen J.T., Fikes J.D., Guarente L.
- Mol. Cell. Biol. 11:611-619(1991).
-