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- ********************************************
- * Myb DNA-binding domain repeat signatures *
- ********************************************
-
- The retroviral oncogene v-myb , and its cellular counterpart c-myb, encode
- nuclear DNA-binding proteins that specifically recognize the sequence
- YAAC(G/T)G [1]. The myb family also includes the following proteins:
-
- - Drosophila D-myb [2].
- - Vertebrate myb-like proteins A-myb and B-myb [3].
- - Maize C1 protein, a trans-acting factor which controls the expression of
- genes involved in anthocyanin biosynthesis.
- - Maize P protein [4], a trans-acting factor which regulates the biosynthetic
- pathway of a flavonoid-derived pigment in certain floral tissues.
- - Arabidopsis thaliana protein GL1 [5], required for the initiation of
- differentiation of leaf hair cells (trichomes).
- - A number of myb/c1-related proteins in maize and barley, whose roles are
- not yet known [4].
- - Yeast BAS1 [7], a transcriptional activator for the HIS4 gene.
- - Yeast REB1 [8], which recognizes sites within both the enhancer and the
- promoter of rRNA transcription, as well as upstream of many genes
- transcribed by RNA polymerase II.
-
- One of the most conserved regions in all of these proteins is a domain of 160
- amino acids. It consists of three tandem repeats of 51 to 53 amino acids. In
- myb, this repeat region has been shown [9] to be involved in DNA-binding.
-
- The major part of the first repeat is missing in retroviral v-myb sequences
- and in plant myb-related proteins. Yeast REB1 differs from the other proteins
- in this family in having a single myb-like domain.
-
- As shown in the following schematic representation, we have developed two
- signature patterns for myb-like domains; the first is located in the
- N-terminal section, the second spans the C-terminal extremity of the domain.
-
- xxxxxxxxxWxxxEDxxxxxxxxxxxxxxWxxIxxxxxxRxxxxxxxxWxxxx
- ********* ************************
-
- '*' : Position of the patterns.
-
- -Consensus pattern: W-[ST]-x(2)-E-[DE]-x(2)-[LIV]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: 29.
-
- -Note: this pattern detects the three patterns in myb, d-myb, A-myb and B-myb;
- the first of the two complete copies in plant myb-related proteins, and the
- last two copies of yeast BAS1.
-
- -Consensus pattern: W-x(2)-[LI]-[SAG]-x(4,5)-R-x(8)-[YW]-x(3)-[LIVM]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: Xenopus gap-junction protein beta-
- 1, Berne virus RNA polymerase and Caenorhabditis elegans fem-3.
-
- -Note: this pattern detects the three copies of the domain in myb, d-myb,
- A-myb and B-myb; the second of the two complete copies of plant myb-related
- proteins, and the last two copies of yeast BAS1.
-
- -Last update: June 1994 / Text revised.
-
- [ 1] Biednkapp H., Borgmeyer U., Sippel A.E., Klempnauer K.-H.
- Nature 335:835-837(1988).
- [ 2] Peters C.W.B., Sippel A.E., Vingron M., Klempnauer K.-H.
- EMBO J. 6:3085-3090(1987).
- [ 3] Nomura N., Takahashi M., Matsui M., Ishii S., Date T., Sasamoto S.,
- Ishizaki R.
- Nucleic Acids Res. 16:11075-11090(1988).
- [ 4] Grotewold E., Athma P., Peterson T.
- Proc. Natl. Acad. Sci. U.S.A. 88:4587-4591(1991).
- [ 5] Oppenheimer D.G., Herman P.L., Sivakumaran S., Esch J., Marks M.D.
- Cell 67:483-493(1991).
- [ 6] Marocco A., Wissenbach M., Becker D., Paz-Ares J., Saedler H.,
- Salamini F., Rohde W.
- Mol. Gen. Genet. 216:183-187(1989).
- [ 7] Tice-Baldwin K., Fink G.R., Arndt K.T.
- Science 246:931-935(1989).
- [ 8] Ju Q., Morrow B.E., Warner J.R.
- Mol. Cell. Biol. 10:5226-5234(1990).
- [ 9] Klempnauer K.-H., Sippel A.E.
- EMBO J. 6:2719-2725(1987).
-