All the proteins that are made up of amino acids and sugars or glucose are called glycoproteins. If these proteins contain fructose instead of glucose, they are called mucoproteins and if they contain galactose, they are called galactoproteins. It is soluble in alkali. Cell membranes, jellyfish and saliva contain this protein. Eg- thyroglobin (thyroid), plasma glycoprotein (liver), immunoglobulin (blood cells), ribonuclease (RNA), deoxyribonuclease (DNA), mucin, peptidoglycan (bacteria), ovoalbumin (ovum).

All the proteins that are made up of amino acids and nucleic acids are called nucleoproteins. All these proteins are located in chromosomes. It is soluble in water. These proteins are found in cell nuclei, viruses and ribosomes. For example, chromatin.

Proteins in which amino acids and other components can be found on wet analysis are called conjugated proteins. A conjugated protein consists of two parts. Protein part and non-protein part. The protein part is called apoenzyme and the non-protein part is called prosthetic group

Proteins in which amino acids and other components can be found on wet analysis are called conjugated proteins. A conjugated protein consists of two parts. Protein part and non-protein part. The protein part is called apoenzyme and the non-protein part is called prosthetic group. Conjugated proteins depending on the prosthetic group are:
1. Nucleoprotein: All the proteins that are made up of amino acids and nucleic acids are called nucleoproteins. All these proteins are located in chromosomes. It is soluble in water. These proteins are found in cell nuclei, viruses and ribosomes. For example, chromatin.
2. Glycoprotein: All the proteins that are made up of amino acids and sugars or glucose are called glycoproteins. If these proteins contain fructose instead of glucose, they are called mucoproteins and if they contain galactose, they are called galactoproteins. It is soluble in alkali. Cell membranes, jellyfish and saliva contain this protein. Eg- thyroglobin (thyroid), plasma glycoprotein (liver), immunoglobulin (blood cells), ribonuclease (RNA), deoxyribonuclease (DNA), mucin, peptidoglycan (bacteria), ovoalbumin (ovum).
3. Lipoprotein: The organic compound formed by the combination of protein and lipid is called lipoprotein. It is soluble in water, but insoluble in organic solvents. It forms the membranes of different types of cells. There are 5 types of lipoproteins. Chylomicrons, VLDL, LDL, IDL and HDL.
4. Phosphoprotein: All proteins that are formed by amino acids and phosphate or phosphorus are called phosphoproteins. It is insoluble in water, but soluble in organic solvents. E.g. Casein (Milk), Ovovitelin (Egg) etc.
5. Chromoprotein: Prosthetic group of proteins formed by dyes is called chromoprotein. Eg- Bilirubin, Chlorophyll, Hemoglobin, Carotenoids, Flavoprotein, Rhodopsin, Biliprotein, Myoglobin, Cytochrome, Hemocyanin etc.
6. Metalloprotein: The prosthetic group of protein which is formed by any metal (Fe, Mn, Mg, Zn, Cu, Co, Mo) is called metalloprotein. Such as siderophyllin, ceruloplasmin, ferridoxine, cytochrome, oxidase, ferritin, nitrogenase, hemoglobin etc.
7. Flavoprotein: The protein which is attached to flavin compound (FAD) is called flavoprotein. Eg- Sulfide reductase, succinate dehydrogenase, NADH-dehydrogenase etc.
8. Porphyrin: The protein that porphyrin is associated with iron or cytochrome is called porphyrin or cytochrome protein. E.g. Cytochrome-b.

This protein is insoluble in water, salt, acid and alkaline solutions. It is called ‘animal skeletal protein’. This protein is not present in the plant body. Lives only in animal bodies. It has no action on enzymes. It is found in animal bones, hair, nails, horns, skin, hoofs etc. Eg- keratin (skin, nails, hair), collagen (skin), tendon (bone), elastin (ligament), fibroin (silk) etc.

Histone protein is composed of several basic amino acids. It is soluble in water, but insoluble in ammonium hydroxide. They do not coagulate in heat. It is located in the nucleus or chromosomes. Chromosomes contain histone proteins H1, H2, H3, H4 etc. Histones play an important role in gene expression. For example, arginine, lysine, nucleohistone, globin etc.

The protein which hydrolyzes to produce large amount of proline and ammonia is called prolamine. It is insoluble in water. But 70-80% soluble in ethyl alcohol. They do not coagulate in heat. It is found only in the seeds of plants. Animals do not contain prolamin. Eg – gliadin (rice/rye/wheat), zein (bhutra), hordin (barley/barley) etc.

Protamine is the smallest protein. It is soluble in water, weak acids and ammonium hydroxide. It does not coagulate in heat. Their molecular weight is 5,000 daltons. This protein is found in the nucleus of some fish sperm. For example, clupine (herring), arginine (rice), salmin (salmon), cyprinine (carp), stearine (sturgeon) etc.

Glutelin is insoluble in water, but soluble in mild acids and alkalis. It does not coagulate in heat. It is present in plant grains. Animals do not contain glutelin. Eg – Glutenin (Wheat/Bhutra), Origenin (Rice) etc.

Globulin is insoluble in water but soluble in weak salt solutions. It coagulates in heat. It is stored as stored food in seeds. However, this protein is also found in animal bodies. Their molecular weight is 3500 daltons. It is present in egg yolk, plasma and semen. Eg- phosvitin (yolk), ovoglobin (egg yolk), tuberin (round potato), lactoglobin (milk), ovoglobin (seed), alphaglobin (blood), serumglobin (blood), myosinogen (muscle), pseudoglobulin (chick/whey). , glycine (soybean), pomelin (orange), erachin (peanut), legumin (pea), edestin (cotton/shaan), crystallin (eye lens) etc.