Statistical analysis of functional region(s) of the TSH receptor.
In this study, we apply recently developed methods to evaluate the thyrotropin receptor (TSH-R). These methods are called deviation (DEV) model, deviation decrease (DD) and DEV/DD analyses, and are based on deviation of amino acid sequences. A 3-dimensional structure model of TSH-R was graphically constructed, and found to possess a large central cavity (donut-like structure). The N-terminus was found to be in the center of the whole extracellular structure and to form a part of the bottom of the cavity. High DEV values indicate deviated amino acid compositions in the protein and were seen in 7 regions, 6 of which were found to be in regions with hydrophilic and acrophilic character. On the basis of the analysis of intra-molecular cis-acting relationships, 7 pairs of regions were presumed to be closely related. Further, when 3 exoplasmic loop lesions were analyzed similarly, 3 other regions were shown to have a close relationship with the cell surface. DEV/DD values were applied to predict the interface of TSH-R with trans-acting molecules such as TSH-R antibody or TSH. The regions in association with trans-acting molecules were seen in 14 regions, 11 of which included the high DEV regions. Both of the TSH-R specific regions in the N- and C-terminal side, especially the latter, were found to be the major components.
Sugawa
H
H
Department of Laboratory Medicine, Kyoto University Faculty of Medicine, Japan.
Ueda
Y
Y
Akamizu
T
T
Kosugi
S
S
Okuda
J
J
Ohta
C
C
Kiho
Y
Y
Mori
T
T
D000595:Amino Acid Sequence; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D005110:Extracellular Space / Q000378:metabolism; D006801:Humans; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011487:Protein Conformation; D011989:Receptors, Thyrotropin / Q000737:chemistry*
D011989:Receptors, Thyrotropin