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Evolutionary divergence of thyrotropin receptor structure.

Abstract：

:The availability of 18 thyrotropin receptor (TSHR) sequences, including two recent entries for primates and seven from fish, have allowed us to investigate diversification of residues or domains during evolution. We used a likelihood ratio test for evolutionary rate shifts [Proc. Natl. Acad. Sci. 98 (2001) 14512] using LH/CGR sequences as an out-group. At each residue in the alignment, a statistical test was performed for a rate shift at the divergence between mammals and fish. Eighty-two rate shift sites were found, significantly more than was expected (p < 0.0001). The occurrence of rate shifts was highest in the intracellular tail, lowest in the transmembrane serpentine and intermediate in the ectodomain. In 52 mammalian sites, the rates were significantly faster than for the corresponding sites in fish. We have identified rate shift in sites important to TSHR function or in intimate proximity to such regions. The former category includes residues 53 and 55 (of LLR1 beta strand) and 253 and 255 (of LLR9 beta strand), crucial to TSH thyrotropic activity, residue 113, the site of N-linked glycosylation limited to humans, residue 310, an important switch in the hinge region for receptor binding and constitutive activity and residue 382 which centres a motif important for TSH-mediated receptor activation. The rate shifts positions close to functional region include a site proximal to a TSHR-specific motif on LLR3 beta strand, sites important in TM helix structure and homodimerization as well as, in the case of the third intracellular loop, to TSHR/G protein coupling. Rate shift analyses have identified residues whose manipulation in the human TSHR may lead to better understanding of receptor functions and help in the creation of designer analogues.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Knudsen B,Farid NR

doi

10.1016/j.ymgme.2004.01.010

subject

Has Abstract

pub_date

2004-04-01 00:00:00

pages

322-34

issue

4

eissn

1096-7192

issn

1096-7206

pii

S1096719204000289

journal_volume

81

pub_type

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