Titin

This article is about the protein. For the comic book character, see Tintin.

Sliding filament model of muscle contraction. (Titin labeled at upper right.)
Titin
Identifiers
Symbol	TTN
Entrez	7273
HUGO	12403
OMIM	188840
RefSeq	NM_133378
UniProt	Q8WZ42
Other data
Locus	Chr. 2 q31

Titin, also known as connectin (UniProt name: Q10466_HUMAN; accession number: Q10466), is a protein that is important in the contraction of striated muscle tissues. Titin connects the Z line to the M line in the sarcomere. The protein limits the range of motion of the sarcomere in tension, thus contributing to the passive stiffness of muscle. Variations in the sequence of titin between different types of muscle (e.g. cardiac or skeletal) has been correlated with differences in the mechanical properties of the muscles.

Titin is the largest known protein, consisting of 26,926 amino acids. The molecular weight of the mature protein is approximately 2,993,451.39 Da, and it has a theoretical pI of 6.01. The protein's chemical formula is C₁₃₂₉₈₃H₂₁₁₈₆₁N₃₆₁₄₉O₄₀₈₈₃S₆₉₃. It has a theoretical instability index (II) of 39.69, indicating that it would be stable in a test tube. The protein's in vivo half-life, the time it takes for half of the amount of protein in a cell to disappear after its synthesis in the cell, is predicted to be approximately 30 hours (in mammalian reticulocytes).

As the largest known protein, titin has the longest full chemical name. The full chemical name, containing 189,819 letters, is sometimes stated to be the longest word in the English language.

External links

• Full chemical name of titin

de:Titin