The Longest Word In The World: The Full Chemical Name Of Titin

Full IUPAC Name for the Protein Titin


You may have heard of the longest word in the world, but did you know that it is actually the full chemical name of a protein called titin? Titin is one of the largest known proteins and plays an important role in muscle contraction. In this article, we will explore the full chemical name of titin and its significance.

The Full Chemical Name of Titin

The full chemical name of titin is: METHIONYLTHREONYLTHREONYGLUTAMINYLARGINYL ISOLEUCINE This word has a total of 189,819 letters and takes over three hours to pronounce! It was first discovered by a group of German scientists in 1975 and was officially recognized by the Guinness World Records as the longest word in the world in 1985.

The Significance of Titin

Titin is an essential protein in muscle contraction as it acts as a molecular spring, allowing muscles to stretch and recoil. It is also involved in regulating muscle stiffness and has been linked to various muscle disorders. Understanding the structure and function of titin is important in developing treatments for these disorders.

The Breakdown of the Word

Breaking down the full chemical name of titin can help us understand its composition. The word consists of 189 amino acids, the building blocks of proteins. Methionine, threonine, glutamine, arginine, and isoleucine are all amino acids that make up the word. The repetition of threonine three times is what gives the word its length.

How to Pronounce the Word

Pronouncing the full chemical name of titin is no easy feat. It takes over three hours to say the word in its entirety! However, if you want to attempt it, the pronunciation is as follows: METH-ee-on-il-THREE-on-il-THREE-on-ee-GLOO-ta-MIN-il-AR-jin-il-I-so-LOO-sin


The full chemical name of titin may be the longest word in the world, but it is also a significant protein in muscle contraction. Understanding its structure and function can help in the development of treatments for muscle disorders. While pronouncing the word may be a challenge, its importance cannot be understated.