1ict is a 8 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
[TTHY_HUMAN] Defects in TTR are the cause of amyloidosis transthyretin-related (AMYL-TTR) [MIM:105210]. A hereditary generalized amyloidosis due to transthyretin amyloid deposition. Protein fibrils can form in different tissues leading to amyloid polyneuropathies, amyloidotic cardiomyopathy, carpal tunnel syndrome, systemic senile amyloidosis. The disease includes leptomeningeal amyloidosis that is characterized by primary involvement of the central nervous system. Neuropathologic examination shows amyloid in the walls of leptomeningeal vessels, in pia arachnoid, and subpial deposits. Some patients also develop vitreous amyloid deposition that leads to visual impairment (oculoleptomeningeal amyloidosis). Clinical features include seizures, stroke-like episodes, dementia, psychomotor deterioration, variable amyloid deposition in the vitreous humor.[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72] Defects in TTR are a cause of hyperthyroxinemia dystransthyretinemic euthyroidal (HTDE) [MIM:145680]. It is a condition characterized by elevation of total and free thyroxine in healthy, euthyroid persons without detectable binding protein abnormalities.[73] Defects in TTR are a cause of carpal tunnel syndrome type 1 (CTS1) [MIM:115430]. It is a condition characterized by entrapment of the median nerve within the carpal tunnel. Symptoms include burning pain and paresthesias involving the ventral surface of the hand and fingers which may radiate proximally. Impairment of sensation in the distribution of the median nerve and thenar muscle atrophy may occur. This condition may be associated with repetitive occupational trauma, wrist injuries, amyloid neuropathies, rheumatoid arthritis.[74]
Function
[TTHY_HUMAN] Thyroid hormone-binding protein. Probably transports thyroxine from the bloodstream to the brain.[75]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The crystal structure of a new polymorphic form of human transthyretin (hTTR) with a lattice containing a unique assembly of apo hTTR and TTR-T(4) complex has been determined to 3 A resolution. The monoclinic form of human TTR reported here crystallizes in space group P2(1), with unit-cell parameters a = 76.7 (6), b = 96.7 (8), c = 81.7 (4) A, beta = 106.8 (4) degrees. The asymmetric unit contains two tetramers of transthyretin related by the non-crystallographic symmetry (NCS) operation of a 90.28 degrees rotation between two hTTR molecules around an axis close to crystallographic z. The r.m.s. difference between the two tetramers calculated from their C(alpha) positions is 0.48 A. The structure was refined using 15.0-3.0 A resolution data to R = 22.9% and R(free) = 28.9% for reflections F > 0.0sigma(F), and R = 19.7% and R(free) = 25.8% for reflections F > 3.0sigma(F). The intermolecular interactions involve the tips of alpha-helices and loops around Arg21, Glu61 and Ser100 of all monomers. The electron-density maps revealed residual thyroxine (T(4)) bound in only one of the two unique tetrameric TTR molecules, with an occupancy of 53%, while the second tetramer is unliganded. One thyroxine ligand is bound in a way similar to the orientations described for the orthorhombic form of the hTTR-T(4) complex. The T(4) bound in the second site is positioned similar to 3',5'-dinitro-N-acetyl-L-thyronine in its hTTR complex. Differences in the size of the central channel defined by the D, A, G and H beta-strands of two monomeric subunits are observed between the apo TTR and T(4)-bound tetramer. The averaged distances between Ala108 C(alpha) and its equivalent measured across each binding site are 12.34 A for the T(4)-bound and 10.96 A for the unliganded TTR tetramer, respectively. The observed differences might reflect the mechanics of the ligand binding in the channel and possibly explain the observed negative cooperativity effect for ligand binding.
Structure of a new polymorphic monoclinic form of human transthyretin at 3 A resolution reveals a mixed complex between unliganded and T4-bound tetramers of TTR.,Wojtczak A, Neumann P, Cody V Acta Crystallogr D Biol Crystallogr. 2001 Jul;57(Pt 7):957-67. Epub 2001, Jun 21. PMID:11418763[76]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
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↑Skare J, Jones LA, Myles N, Kane K, Milunsky A, Cohen A, Skinner M. Two transthyretin mutations (glu42gly, his90asn) in an Italian family with amyloidosis. Clin Genet. 1994 Jun;45(6):281-4. PMID:7923855
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↑Hamilton JA, Steinrauf LK, Braden BC, Liepnieks J, Benson MD, Holmgren G, Sandgren O, Steen L. The x-ray crystal structure refinements of normal human transthyretin and the amyloidogenic Val-30-->Met variant to 1.7-A resolution. J Biol Chem. 1993 Feb 5;268(4):2416-24. PMID:8428915
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↑Ueno S, Uemichi T, Takahashi N, Soga F, Yorifuji S, Tarui S. Two novel variants of transthyretin identified in Japanese cases with familial amyloidotic polyneuropathy: transthyretin (Glu42 to Gly) and transthyretin (Ser50 to Arg). Biochem Biophys Res Commun. 1990 Jun 29;169(3):1117-21. PMID:2363717
↑Saeki Y, Ueno S, Yorifuji S, Sugiyama Y, Ide Y, Matsuzawa Y. New mutant gene (transthyretin Arg 58) in cases with hereditary polyneuropathy detected by non-isotope method of single-strand conformation polymorphism analysis. Biochem Biophys Res Commun. 1991 Oct 15;180(1):380-5. PMID:1656975
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↑Tachibana N, Tokuda T, Yoshida K, Taketomi T, Nakazato M, Li YF, Masuda Y, Ikeda S. Usefulness of MALDI/TOF mass spectrometry of immunoprecipitated serum variant transthyretin in the diagnosis of familial amyloid polyneuropathy. Amyloid. 1999 Dec;6(4):282-8. PMID:10611950
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↑Bergstrom J, Patrosso MC, Colussi G, Salvadore M, Penco S, Lando G, Marocchi A, Ueda A, Nakamura M, Ando Y. A novel type of familial transthyretin amyloidosis, ATTR Asn124Ser, with co-localization of kappa light chains. Amyloid. 2007 Jun;14(2):141-5. PMID:17577687 doi:779687106
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↑Moses AC, Rosen HN, Moller DE, Tsuzaki S, Haddow JE, Lawlor J, Liepnieks JJ, Nichols WC, Benson MD. A point mutation in transthyretin increases affinity for thyroxine and produces euthyroid hyperthyroxinemia. J Clin Invest. 1990 Dec;86(6):2025-33. PMID:1979335 doi:https://dx.doi.org/10.1172/JCI114938
↑Murakami T, Tachibana S, Endo Y, Kawai R, Hara M, Tanase S, Ando M. Familial carpal tunnel syndrome due to amyloidogenic transthyretin His 114 variant. Neurology. 1994 Feb;44(2):315-8. PMID:8309582
↑Herbert J, Wilcox JN, Pham KT, Fremeau RT Jr, Zeviani M, Dwork A, Soprano DR, Makover A, Goodman DS, Zimmerman EA, et al.. Transthyretin: a choroid plexus-specific transport protein in human brain. The 1986 S. Weir Mitchell award. Neurology. 1986 Jul;36(7):900-11. PMID:3714052
↑Wojtczak A, Neumann P, Cody V. Structure of a new polymorphic monoclinic form of human transthyretin at 3 A resolution reveals a mixed complex between unliganded and T4-bound tetramers of TTR. Acta Crystallogr D Biol Crystallogr. 2001 Jul;57(Pt 7):957-67. Epub 2001, Jun 21. PMID:11418763
