Biomaterial Database

Effect of lysine residue modification of ovine luteinizing hormone by heterobifunctional crosslinking reagent SPDP on subunit-subunit association, receptor binding and biological activity. 1992

V Singh, and A K Mavila, and A Alam

Institute of Self Organising Systems and Biophysics, North-Eastern Hill University, Shillong, India.

The increasing use of heterobifunctional crosslinking agent in the design of hormone-carrier conjugates for selective targeting or inducing immune response against the hormone has prompted us to study the effect of epsilon-NH2 group modification of oLH-subunit, their recombination, immunoreactivity, receptor binding and biological activity. The epsilon-NH2 groups of oLH alpha and oLH beta subunits were modified by using SPDP. The SPDP modified oLH alpha derivatives hybridize to native OLH beta as judged by RP-HPLC analysis. The sequential modification of alpha and beta subunits led to progressive reduction in immunoreactivity and receptor binding activities. The steroidogenic potential of oLH beta.SPDP.alpha oLH recombinant was relatively comparable. The modification of six or more epsilon-NH2 groups in oLH alpha although recombine fully with native oLH beta but failed to react to anti-oLH antibody. Moreover, steroidogenic activity was also abolished. Introduction up to four SPDP groups in oLH alpha compromised immunological and biological activities but further addition of two more SPDP groups completely abolished antibody reactivity, receptor binding and steroidogenic activity indicating the importance of later two -NH2 groups in the receptor recognition and steroidogenic potential.

UI	MeSH Term	Description	Entries
D007986	Luteinizing Hormone	A major gonadotropin secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). Luteinizing hormone regulates steroid production by the interstitial cells of the TESTIS and the OVARY. The preovulatory LUTEINIZING HORMONE surge in females induces OVULATION, and subsequent LUTEINIZATION of the follicle. LUTEINIZING HORMONE consists of two noncovalently linked subunits, alpha and beta. Within a species, the alpha subunit is common in the three pituitary glycoprotein hormones (TSH, LH and FSH), but the beta subunit is unique and confers its biological specificity.	ICSH (Interstitial Cell Stimulating Hormone),Interstitial Cell-Stimulating Hormone,LH (Luteinizing Hormone),Lutropin,Luteoziman,Luteozyman,Hormone, Interstitial Cell-Stimulating,Hormone, Luteinizing,Interstitial Cell Stimulating Hormone
D008297	Male		Males
D010902	Pituitary Gland	A small, unpaired gland situated in the SELLA TURCICA. It is connected to the HYPOTHALAMUS by a short stalk which is called the INFUNDIBULUM.	Hypophysis,Hypothalamus, Infundibular,Infundibular Stalk,Infundibular Stem,Infundibulum (Hypophysis),Infundibulum, Hypophyseal,Pituitary Stalk,Hypophyseal Infundibulum,Hypophyseal Stalk,Hypophysis Cerebri,Infundibulum,Cerebri, Hypophysis,Cerebrus, Hypophysis,Gland, Pituitary,Glands, Pituitary,Hypophyseal Stalks,Hypophyses,Hypophysis Cerebrus,Infundibular Hypothalamus,Infundibular Stalks,Infundibulums,Pituitary Glands,Pituitary Stalks,Stalk, Hypophyseal,Stalk, Infundibular,Stalks, Hypophyseal,Stalks, Infundibular
D011869	Radioligand Assay	Quantitative determination of receptor (binding) proteins in body fluids or tissue using radioactively labeled binding reagents (e.g., antibodies, intracellular receptors, plasma binders).	Protein-Binding Radioassay,Radioreceptor Assay,Assay, Radioligand,Assay, Radioreceptor,Assays, Radioligand,Assays, Radioreceptor,Protein Binding Radioassay,Protein-Binding Radioassays,Radioassay, Protein-Binding,Radioassays, Protein-Binding,Radioligand Assays,Radioreceptor Assays
D011974	Receptors, LH	Those protein complexes or molecular sites on the surfaces and cytoplasm of gonadal cells that bind luteinizing or chorionic gonadotropic hormones and thereby cause the gonadal cells to synthesize and secrete sex steroids. The hormone-receptor complex is internalized from the plasma membrane and initiates steroid synthesis.	Chorionic Gonadotropin Receptors,Human Chorionic Gonadotropin Receptors,ICSH Receptors,LH Receptors,LH-hCG Receptor,LH-hCG Receptors,Luteinizing Hormone Receptors,Lutropin Receptor,Lutropin Receptors,Receptors, Chorionic Gonadotropin,Receptors, Human Chorionic Gonadotropin,Receptors, Interstitial Cell-Stimulating Hormone,Receptors, Luteinizing Hormone,hCG Receptors,Chorionic Gonadotropin Receptor,Human Chorionic Gonadotropin Receptor,LH Receptor,Luteinizing Hormone Receptor,Receptors, ICSH,Receptors, Interstitial Cell Stimulating Hormone,Receptors, LH-hCG,Receptors, Lutropin,Receptors, hCG,hCG Receptor,Gonadotropin Receptor, Chorionic,Gonadotropin Receptors, Chorionic,Hormone Receptor, Luteinizing,Hormone Receptors, Luteinizing,LH hCG Receptor,LH hCG Receptors,Receptor, Chorionic Gonadotropin,Receptor, LH,Receptor, LH-hCG,Receptor, Luteinizing Hormone,Receptor, Lutropin,Receptor, hCG,Receptors, LH hCG
D003432	Cross-Linking Reagents	Reagents with two reactive groups, usually at opposite ends of the molecule, that are capable of reacting with and thereby forming bridges between side chains of amino acids in proteins; the locations of naturally reactive areas within proteins can thereby be identified; may also be used for other macromolecules, like glycoproteins, nucleic acids, or other.	Bifunctional Reagent,Bifunctional Reagents,Cross Linking Reagent,Crosslinking Reagent,Cross Linking Reagents,Crosslinking Reagents,Linking Reagent, Cross,Linking Reagents, Cross,Reagent, Bifunctional,Reagent, Cross Linking,Reagent, Crosslinking,Reagents, Bifunctional,Reagents, Cross Linking,Reagents, Cross-Linking,Reagents, Crosslinking
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
D012756	Sheep	Any of the ruminant mammals with curved horns in the genus Ovis, family Bovidae. They possess lachrymal grooves and interdigital glands, which are absent in GOATS.	Ovis,Sheep, Dall,Dall Sheep,Ovis dalli
D013053	Spectrophotometry	The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.
D013388	Succinimides	A subclass of IMIDES with the general structure of pyrrolidinedione. They are prepared by the distillation of ammonium succinate. They are sweet-tasting compounds that are used as chemical intermediates and plant growth stimulants.	Butanimides,Pyrrolidinediones