Primary Citation of Related Structures:   1GR3
PubMed Abstract: 
Collagen X is expressed specifically in the growth plate of long bones. Its C1q-like C-terminal NC1 domain forms a stable homotrimer and is crucial for collagen X assembly. Mutations in the NC1 domain cause Schmid metaphyseal chondrodysplasia (SMCD). The crystal structure at 2 ...
Collagen X is expressed specifically in the growth plate of long bones. Its C1q-like C-terminal NC1 domain forms a stable homotrimer and is crucial for collagen X assembly. Mutations in the NC1 domain cause Schmid metaphyseal chondrodysplasia (SMCD). The crystal structure at 2.0 A resolution of the human collagen X NC1 domain reveals an intimate trimeric assembly strengthened by a buried cluster of calcium ions. Three strips of exposed aromatic residues on the surface of NC1 trimer are likely to be involved in the supramolecular assembly of collagen X. Most internal SMCD mutations probably prevent protein folding, whereas mutations of surface residues may affect the collagen X suprastructure in a dominant-negative manner.
Related Citations: 
Metaphyseal Chondrodysplasia Type Schmid Mutations are Predicted to Occur in Two Distinct Three-Dimensional Clusters within Type X Collagen Nc1 Domains that Retain the Ability to Trimerize Marks, D.S., Gregory, C.A., Wallis, G.A., Brass, A., Kadler, K.E., Boot-Handford, R.P. (1999) J Biol Chem 274: 3632
Phenotypic and Biochemical Consequences of Collagen X Mutations in Mice and Humans Chan, D., Jacenko, O. (1998) Matrix Biol 17: 169