SOLUTION STRUCTURE OF HUMAN P8-MTCP1, A CYSTEINE-RICH PROTEIN ENCODED BY THE MTCP1 ONCOGENE,REVEALS A NEW ALPHA-HELICAL ASSEMBLY MOTIF, NMR, MINIMIZED AVERAGE STRUCTURE
Primary Citation of Related Structures: 1HP8, 2HP8
PubMed Abstract:
MTCP1 (for Mature-T-Cell Proliferation) is the first gene unequivocally identified in the group of uncommon leukemias with a mature phenotype. The three-dimensional solution structure of the human p8(MTCP1) protein encoded by the MTCP1 oncogene was determined by homonuclear proton two-dimensional NMR methods at 600 MHz ...
MTCP1 (for Mature-T-Cell Proliferation) is the first gene unequivocally identified in the group of uncommon leukemias with a mature phenotype. The three-dimensional solution structure of the human p8(MTCP1) protein encoded by the MTCP1 oncogene was determined by homonuclear proton two-dimensional NMR methods at 600 MHz. After sequence specific assignments, a total of 931 distance restraints and 57 dihedral restraints were collected. The location of the three previously unassigned disulfide bridges was determined from preliminary DIANA structures, using a statistical analysis of intercystinyl distances. The solution structure of p8(MTCP1) is presented as a set of 30 DIANA structures, further refined by restrained molecular dynamics using a simulated annealing protocol with the AMBER force field. The r.m.s.d. values with respect to the mean structure for the backbone and all heavy atoms for a family of 30 structures are 0.73(+/-0.28) and 1.17(+/-0.23) A, when the structured core of the protein (residues 5 to 63) is considered. The solution structure of p8(MTCP1) reveals an original scaffold consisting of three alpha helices, associated with a new cysteine motif. Two of the helices are covalently paired by two disulfide bridges, forming an alpha-hairpin which resembles an antiparallel coiled-coil. The third helix is oriented roughly parallel to the plane defined by the alpha-antiparallel motif and its axis forms an angle of approximately 60 degrees with respect to the main axis of this motif.
Related Citations:
The Mtcp-1/C6.1B Gene Encodes for a Cytoplasmic 8 Kd Protein Overexpressed in T Cell Leukemia Bearing a T(X;14) Translocation Soulier, J., Madani, A., Cacheux, V., Rosenzwajg, M., Sigaux, F., Stern, M.H. (1994) Oncogene 9: 3565
Mtcp-1: A Novel Gene on the Human Chromosome Xq28 Translocated to the T Cell Receptor Alpha/Delta Locus in Mature T Cell Proliferations Stern, M.H., Soulier, J., Rosenzwajg, M., Nakahara, K., Canki-Klain, N., Aurias, A., Sigaux, F., Kirsch, I.R. (1993) Oncogene 8: 2475
Organizational Affiliation:
CNRS-UMR 9955, INSERM-U414, Faculté de Pharmacie, Université de Montpellier I, 15 Avenue Charles Flahault, Montpellier Cedex, 34060, France.
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