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Topic: Ligand

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	Ligand --Biotechnology Encyclopedia
		The charge on the central atom constrains the number of ligands that may be bonded, since each type of ligand donates a characteristic number of electrons and there is a requirement for overall neutrality.
		Ligands which bind to the central atom through more than one site of their own are termed polydentate; a ligand binding through two sites, for example, is bidentate.
		polyhedron, and the corners of that shape were the locations of the ligands.
	www.biotech100.com /biotechnology_encyclopedia/ligand.htm (428 words)

	Protein - Wikipedia, the free encyclopedia
		Receptors and other tight-binding proteins form another major functional class whose primary duties are to transport ligands through the cell and through the body, and to recognize extracellular stimuli and signaling molecules.
		If the ligand is a molecule acted upon in a chemical reaction, it is known as a substrate and its binding site on the protein is an active site.
		Allosteric modulation is a means of regulation by which a ligand, usually a small organic compound, binds to a protein at a binding site located outside the active site and affects the activity of the enzyme, often by inducing a conformational change.
	en.wikipedia.org /wiki/Protein (4470 words)

	ligand - HighBeam Encyclopedia
		LIGAND [ligand], charged or uncharged molecule with one or more unshared pairs of electrons that can attach to a central metallic atom or ion to form an aggregate known as a complex ion (see chemical bond).
		Some common bases that act as ligands are water and ammonia molecules and halide, hydroxide, acetate, cyanide, thiocyanate, and nitrite anions.
		Polyfunctional ligands, which bind to the metal ion with two or more pairs of electrons, are called chelates (see chelating agents).
	www.encyclopedia.com /html/l/ligand.asp (364 words)

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