Structure of the cysteine-rich intestinal protein, CRIP.Perez-Alvarado, G.C., Kosa, J.L., Louis, H.A., Beckerle, M.C., Winge, D.R., Summers, M.F.
(1996) J.Mol.Biol. 257: 153-174
- PubMed: 8632452
- DOI: 10.1006/jmbi.1996.0153
- PubMed Abstract:
- Structure of the Carboxy-Terminal Lim Domain from the Cysteine Rich Protein Crp
Perez-Alvarado, G.C.,Miles, C.,Michelsen, J.W.,Louis, H.A.,Winge, D.R.,Beckerle, M.C.,Summers, M.F.
(1994) Nat.Struct.Mol.Biol. 1: 388
- Perez-Alvarado, G.C.
(1995) NMR Studies of Lim Domain Proteins --: --
LIM domains are Zn-binding arrays found in a number of proteins involved in the control of cell differentiation, including several developmentally regulated transcription factors and a human proto-oncogene product. The rat cysteine-rich intestinal pr ...
LIM domains are Zn-binding arrays found in a number of proteins involved in the control of cell differentiation, including several developmentally regulated transcription factors and a human proto-oncogene product. The rat cysteine-rich intestinal protein, CRIP, is a 76-residue polypeptide which contains a LIM motif. The solution structure of CRIP has been determined by homonuclear and 1H-15N heteronuclear correlated nuclear magnetic resonance spectroscopy. Structures with individual distance violations of < or = 0.03 angstrom and penalties (squared sum of distance violations) of < or = 0.06 angstrom2 were generated with a total of 500 nuclear Overhauser effect (NOE)-derived distance restraints (averaging 15.6 restraints per refined residue). Superposition of backbone heavy atoms of ordered residues relative to mean atom positions is achieved with pairwise rms deviations of 0.54(+/-0.14) angstrom. As observed previously for a peptide with the sequence of the C-terminal LIM domain from the avian cysteine-rich protein, CRP (cCRP-LIM2), CRIP binds two equivalents of zinc, forming N-terminal CCHC (Cys3, Cys6, His24, Cys27) and C-terminal CCCC (Cys30, Cys33, Cys51, Cys55) modules. The CCHC and CCCC modules in CRIP contain two orthogonally-arrayed antiparallel beta-sheets. The C-terminal end of the CCHC module contains a tight turn and the C terminus of the CCCC module forms an alpha-helix. The modules pack via hydrophobic interactions, forming a compact structure that is similar to that observed for cCRP-LIM2. The most significant differences between the structures occur at the CCHC module-CCCC module interface, which results in a difference in the relative orientations of the modules, and at the C terminus where the alpha-helix appears to be packed more tightly against the preceding antiparallel beta-sheet. The greater abundance of NOE information obtained for CRIP relative to cCRP-LIM2, combined with the analysis of J-coupling and proton chemical shift data, have allowed a more detailed evaluation of the molecular level interactions that stabilize the fold of the LIM motif.
Howard Hughes Medical Institute, Department of Chemistry and Biochemistry, University of Maryland Baltimore County 21228, USA.