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- ****************************
- * Transthyretin signatures *
- ****************************
-
- Transthyretin (prealbumin) [1] is a thyroid hormone-binding protein that seems
- to transport thyroxine (T4) from the bloodstream to the brain. It is a protein
- of about 130 amino acids that assembles as a homotetramer and forms an
- internal channel that binds thyroxine. Tranthyretin is mainly synthesized in
- the brain choroid plexus. In humans, variants of the protein are associated
- with distinct forms of amyloidosis.
-
- The sequence of transthyretin is highly conserved in vertebrates. We selected
- two regions as signature patterns. The first located in the N-terminal
- extremity is centered on a lysine known to be involved in binding T4. The
- second pattern is located in the C-terminal extremity and contains two
- residues also involved in T4-binding.
-
- -Consensus pattern: S-K-C-P-L-M-V-K-V-L-D-A-V-R-G
- [The second K binds thyroxine]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: S-P-[FY]-S-Y-S-T-T-A-[LIVM]-V-[ST]-x-P
- [The third S and the second T bind thyroxine]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: December 1992 / First entry.
-
- [ 1] Duan W., Achen M.G., Richardson S.J., Lawrence M.C., Wettenhall R.E.H.,
- Jaworowski A., Schreiber G.
- Eur. J. Biochem. 200:679-687(1991).
-