Metaprotein is insoluble in water. But soluble in mild acid and alkali. For example, acid metaprotein, alkaline metaprotein etc.

The protein that is formed under the influence of acid or enzyme is called primary produced protein. The primary proteins produced are:
(i) Proteins: Proteins are formed by the reaction of dilute acids, enzymes and water. It is insoluble in water. Edestin to edestan, myosin to myosin, fibrinogen to fibrin, etc.
(ii) Metaprotein: Metaprotein is insoluble in water. But soluble in mild acid and alkali. For example, acid metaprotein, alkaline metaprotein etc.
(iii) Denatured protein: Denatured protein is produced by the effect of heat or alcohol on the protein. It is insoluble in water. For example, the white part of the coagulated egg.

Proteins that are produced from compound proteins are called produced proteins. All these proteins are produced from natural proteins due to enzymes, acids, alkalis or heat. Proteins produced are of two types. Primary produced proteins and secondary produced proteins.

Proteins that are produced from compound proteins are called produced proteins. All these proteins are produced from natural proteins due to enzymes, acids, alkalis or heat. Proteins produced are of two types. Primary produced proteins and secondary produced proteins.
1. Primary produced protein: The protein that is formed under the influence of acid or enzyme is called primary produced protein. The primary proteins produced are:
(i) Proteins: Proteins are formed by the reaction of dilute acids, enzymes and water. It is insoluble in water. Edestin to edestan, myosin to myosin, fibrinogen to fibrin, etc.
(ii) Metaprotein: Metaprotein is insoluble in water. But soluble in mild acid and alkali. For example, acid metaprotein, alkaline metaprotein etc.
(iii) Denatured protein: Denatured protein is produced by the effect of heat or alcohol on the protein. It is insoluble in water. For example, the white part of the coagulated egg.
2. Secondary produced protein: The protein that is formed by wet analysis of protein is called secondary produced protein. Secondary produced proteins are:
(i) Protease: Protease is formed by the action of pepsin and trypsin. It is insoluble in water. But stored in heat. Albuline produces albumose and globulin produces globulose.
(ii) Peptone: Peptone is formed by the action of mild acid and enzymes. It is insoluble in water. Does not coagulate in heat. Ammonium sulfate does not precipitate in solution.
(iii) Peptides: Peptides consist of a small number of amino acids. Amino acids join together to form dipeptides, tripeptides and polypeptides. It is soluble in water. For example, glycine-alanine, leucine-glutamic acid.
(iv) Infraproteins: These are metalloproteins. eg metaprotein.
(v) Coagulated protein: This protein is produced when blood clots.

The protein that porphyrin is associated with iron or cytochrome is called porphyrin or cytochrome protein. E.g. Cytochrome-b.

The protein which is attached to flavin compound (FAD) is called flavoprotein. Eg- Sulfide reductase, succinate dehydrogenase, NADH-dehydrogenase etc.

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.

Prosthetic group of proteins formed by dyes is called chromoprotein. Eg- Bilirubin, Chlorophyll, Hemoglobin, Carotenoids, Flavoprotein, Rhodopsin, Biliprotein, Myoglobin, Cytochrome, Hemocyanin etc.

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.

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.