Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store

Guanidino is present in the amino acid

seo-qna
SearchIcon
Answer
VerifiedVerified
407.1k+ views
Hint: The answer is an essential amino acid that is physiologically active in L form. It has the molecular formula ${{C}_{6}}{{H}_{14}}{{N}_{4}}{{O}_{2}}$. Molecular weight is 174.2 $gmo{{l}^{-1}}$ .

Complete step by step solution:
-As we know amino acids are called building blocks of proteins. As we are aware ,they are a group of organic molecules consisting of a basic amino group ($Nu {{Eta }_{2}}$), an acidic carboxyl group ($-COOH$) along with an organic group R( or side chain) which is unique to each amino acid .
- Guanidine is a compound with the molecular formula $HNC{{(N{{H}_{2}})}_{2}}$. It gets dissolved in the polar solvents and it’s a colourless solid. Guanidine is a strong base and is found in urine as a result of the protein metabolism.
- As we mentioned guanidine is a nitrogen organic base and is widely used in the synthesis of heterocyclic compounds incorporating at least two nitrogen atoms.
- The structure of the guanidino group can be easily thought of as a nitrogenous analogue of the carbonic acid functional group. That is, in guanidine the $C=O$ group in carbonic acid is replaced by a $C=NH$group and each $OH$ is replaced by a $N{{H}_{2}}$ group.
- The guanidine moiety or guanidino functional group appears in larger organic molecules such as on the side chain of the amino acid arginine. Arginine, an essential amino acid, contains a positively charged Guanidino functional group in its side chain.
- Arginine is an $\alpha $-amino acid which is mainly used in the biosynthesis of proteins. This amino acid contains an $\alpha $-amino group, an $\alpha $-carboxylic acid group and also a side chain that consists of a 3-carbon aliphatic straight chain ending in a guanidino functional group
- The guanidino functional group that is present in the side chain of the amino acid arginine plays a major role in the interaction with the enzymes or receptors through hydrogen bonding and electrostatic force of attraction.
-The structures of guanidino group and arginine amino acid are given below

seo images

seo images


Therefore, the answer is Arginine. Guanidino group is present in the amino acid arginine.

Note: Do not confuse guanidine with guanine or guanosine. Guanine is a nucleobase that is found in genetic materials such as DNA and RNA whereas guanosine is a purine nucleoside comprising guanine attached to a ribose ring via a glycosidic linkage.