Table of Contents
Elementary Idea of Primary Structure
The linear sequence of a protein in a specific protein is known as the primary structure. The main structure of a protein is described from the amino-terminal (N) end to the carboxyl-terminal (C) end, as is customary. Ribosomes seem to be the most frequent organelles in cells that facilitate protein biosynthesis. Peptides can also be manufactured in the lab. Primary structures of proteins can be sequenced directly or deduced from DNA sequences. Amino acids are polymerized into a lengthy backbone by peptide bonds, with the various amino acid side chains projecting along with it. Proteins are synthesized by ribosomes in biological systems during translation. Non-ribosomal peptide synthesis, which commonly uses amino acids other than the usual 20, and can be cyclized, is another way for some organisms to generate short peptides.
| S.NO | CONTENT |
| 1 | INTRODUCTION |
| 2 | A BRIEF OUTLINE |
| 3 | IMPORTANT CONCEPTS |
| 4 | EXAMPLES OF PRIMARY STRUCTURE OF PROTEIN |
| 5 | SIGNIFICANCE OF PRIMARY STRUCTURE OF PROTEIN |
| 6 | FAQ’S |
A Brief Outline
Primary structure of protein:
A variety of laboratory procedures can be used to chemically synthesize peptides. Chemical methods often synthesize peptides in the opposite order as biological protein production (beginning at the C-terminus) (starting at the N-terminus). The amino acids are listed from the amino-terminal end to the carboxyl-terminal end of a protein sequence, which is usually written as a string of letters. The 20 occurs naturally amino acids, as well as mixes and ambiguous amino acids, can be represented by a three-letter code or a single-letter code. Direct sequencing of peptides is possible, as is inferring peptide sequences from DNA sequences. There are now large sequence databases that compile known protein sequences.
By analogy to the usage of the phrase in regard to proteins, every linear-chain heteropolymer could be said to have a “primary structure,” however this usage is uncommon compared to the extremely prevalent usage in reference to proteins. The linear chain of nucleotides in RNA, which has an exhaustive structure, is referred to simply as the “sequence,” as it is in DNA.
Proteins are divided into two categories based on their molecular form.
- Fibrous Proteins: A fibre-like structure is generated when polypeptide chains run parallel and are kept together by hydrogen and disulfide bonds. In most cases, these proteins are water-insoluble. These are proteins that aren’t soluble in water.
- Globular Proteins: This structure is formed when polypeptide chains coil around each other to form a spherical shape. These are frequently water-soluble.
Important Concepts
The difference between the primary and secondary structure of the protein
- The main structure consists of linear peptide chains, whereas the secondary structure consists of folded proteins as alpha helices or beta sheets. Only peptide bonds are present in initial protein structure bonds. Created on the basis of the process of translation.
- It’s a simple two-dimensional structure made up entirely of peptide links. Peptide bonds, hydrogen bonds, Vander wall bonds, and other secondary structural bonds exist. The peptide chain’s amines and carboxyl groups interact and fold to generate a secondary structure.
- The primary and secondary structures can then be combined to form tertiary and quaternary structures. Proteins are stable because of the bonds between amino acids in fundamental structure and hydrogen bonding.
- A polypeptide chain is defined as a series of peptide bonds in the amino acid sequence. The polypeptide chain’s amino acids are part of a group of 20 important amino acids.
- A protein’s secondary structure is either a -helix or -sheet that is produced from its basic structure. It is entirely dependent on the creation of hydrogen bonds between amino acid structural components. The backbone of both -helix and -the sheet is made up of regular, repeating patterns.
α-Helix
The -helix is formed by the clockwise coiling of the polypeptide backbone over an imaginary axis. It happens when the oxygen atom in an amino acids carbonyl group (C=O) forms hydrogen bonds with the hydrogen atom in the amine group (NH) of the polypeptide chain’s fourth amino acid.
β-Sheet
Each amino acid’s R-group alternates between pointing above and below the backbone in the -sheet. Hydrogen bonds are formed between adjacent strands that are side-by-side here.
Example of the primary structure of the protein
Haemoglobin is an example of a protein with a primary structure. This protein, which is present in red blood cells, aids in the delivery of oxygen to all of your body’s tissues. The fundamental structure of haemoglobin is critical since even a single amino acid alteration can cause haemoglobin to lose its function. A single amino acid alteration in haemoglobin’s main structure, for example, can induce sickle cell anaemia, a blood disorder characterized by sickle-shaped red blood cells that are defective.
Hexosaminidase, a protein that assists in the regulation of cellular compartments known as lysozymes, is another enzyme with an important fundamental structure.
Significance of protein primary structure in NEET exam
Understudies should have a solid view of the entire liable to complete the NEET evaluation. While each segment is huge, and you should never dismiss any piece of your plan, there is one fair pack that you ought to truly zero in on. Since floating through the NEET evaluation is an especially immense achievement in a student’s life, picking the best survey material is fundamental. The essential target of Infinity Learning is to present confidence in our students. Consequently, we facilitated the science responses to determine every request that a student would present. Since our responses are in pdf configuration, students can get to them at whatever point and from any area.
FAQs
Q. What keeps the structure of proteins stable?
Ans: By retaining the protein in the form created by hydrophobic interactions, hydrogen bonding in the polypeptide chain as well as between amino acid “R” groups helps to preserve protein structure. This type of bonding results in the formation of a disulfide bridge.
Q. What factors influence the structure of proteins?
Ans: The amino acid sequence is related to the main structure of a protein in the polypeptide chain. Peptide bonds are formed during the protein production phase and hold the main structure together. The protein’s primary structure is dictated by the gene that corresponds to it.
Q. What is a protein’s main structure?
Ans: The main structure of a protein is the linear sequence of amino acids that makes up the protein. Proteins are made up of a sequence of only twenty amino acids, and each has a unique side chain. Amino acid side chains are chemically different.
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