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What are Proteins?

What are Proteins?

Antibody Structure

Antibody Structure

Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...

Protein and Protein Structure

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...

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Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...

Antibody Structure

Antibody Structure

Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...

Antibody Structure and Classes

Antibody Structure and Classes

Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.

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Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin

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Molluscan gastrin: concentration and molecular forms.

E Straus, R S Yalow, H Gainer

Science (New York, N.Y.)

|November 14, 1975

Summary

This summary is machine-generated.

Gastrin, a hormone found in mammals, also exists in sea hares and land snails. Its presence and concentration suggest structural similarities between gastrins in mollusks and mammals.

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Area of Science:

Comparative physiology
Endocrinology
Marine biology

Background:

Gastrin is a key hormone regulating gastrointestinal functions in mammals.
Previous research has primarily focused on gastrin within vertebrate systems.

Purpose of the Study:

To investigate the presence and characteristics of gastrin in molluscan species.
To explore potential structural homologies between molluscan and mammalian gastrins.

Main Methods:

Immunohistochemical analysis of gastrin in blood and gastrointestinal tissues.
Quantification of gastrin concentrations using a porcine gastrin standard.

Main Results:

Immunoreactive gastrin was detected in heterogeneous forms within the sea hare (Aplysia californica) and land snail (Otala lactea).
Blood gastrin concentrations in these mollusks were comparable to those observed in mammals like pigs, humans, and dogs.

Conclusions:

Molluscan gastrins share structural similarities with mammalian gastrins, indicating evolutionary conservation.
This study expands our understanding of gastrin's presence beyond vertebrates, suggesting a broader biological role.