Biomaterial Database

Snake venom toxins. The amino-acid sequences of three toxins (9B, 11 and 12A) from Hemachatus haemachatus (Ringhals) venom. 1977

F J Joubert

Three toxins (9B, 11 and 12A) were purified from the venom of Hemachtus haemachatus as described previously. Whereas toxin 11 and 12A comprise 61 amino acid residues, toxin 9B contains 63 residues. All three toxins are cross-linked by four intrachain disulphide bridges. The complete amino acid sequences of these toxins have elucidated. The properties of the toxins were compared with those of the cytotoxin group. The toxicities, the sequences and some of the invariant residues of toxin 11 and 12A resemble the corresponding properties of the cytotoxin group. However their immunochemical properties indicate that they are distinct from both the cytotoxin and neurotoxin groups. The sequence of toxin 9B shows that it is related to the cytotoxins, but its toxicity is much lower than those encountered among members of this group.

UI	MeSH Term	Description	Entries
D010446	Peptide Fragments	Partial proteins formed by partial hydrolysis of complete proteins or generated through PROTEIN ENGINEERING techniques.	Peptide Fragment,Fragment, Peptide,Fragments, Peptide
D002918	Chymotrypsin	A serine endopeptidase secreted by the pancreas as its zymogen, CHYMOTRYPSINOGEN and carried in the pancreatic juice to the duodenum where it is activated by TRYPSIN. It selectively cleaves aromatic amino acids on the carboxyl side.	Alpha-Chymotrypsin Choay,Alphacutanée,Avazyme
D004220	Disulfides	Chemical groups containing the covalent disulfide bonds -S-S-. The sulfur atoms can be bound to inorganic or organic moieties.	Disulfide
D005779	Immunodiffusion	Technique involving the diffusion of antigen or antibody through a semisolid medium, usually agar or agarose gel, with the result being a precipitin reaction.	Gel Diffusion Tests,Diffusion Test, Gel,Diffusion Tests, Gel,Gel Diffusion Test,Immunodiffusions,Test, Gel Diffusion,Tests, Gel Diffusion
D000595	Amino Acid Sequence	The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.	Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D000596	Amino Acids	Organic compounds that generally contain an amino (-NH2) and a carboxyl (-COOH) group. Twenty alpha-amino acids are the subunits which are polymerized to form proteins.	Amino Acid,Acid, Amino,Acids, Amino
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D012910	Snake Venoms	Solutions or mixtures of toxic and nontoxic substances elaborated by snake (Ophidia) salivary glands (Duvernoy's gland) for the purpose of killing prey or disabling predators and delivered by grooved or hollow fangs. They usually contain enzymes, toxins, and other factors.	Duvernoy's Gland Secretion,Duvernoy's Secretion,Snake Toxin,Snake Toxins,Snake Venom,Duvernoy Gland Secretion,Duvernoy Secretion,Duvernoys Gland Secretion,Duvernoys Secretion,Secretion, Duvernoy's,Secretion, Duvernoy's Gland,Toxin, Snake,Venom, Snake
D013820	Thermolysin	A thermostable extracellular metalloendopeptidase containing four calcium ions. (Enzyme Nomenclature, 1992) 3.4.24.27.	Thermolysin S
D014357	Trypsin	A serine endopeptidase that is formed from TRYPSINOGEN in the pancreas. It is converted into its active form by ENTEROPEPTIDASE in the small intestine. It catalyzes hydrolysis of the carboxyl group of either arginine or lysine. EC 3.4.21.4.	Tripcellim,Trypure,beta-Trypsin,beta Trypsin