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Inhibin-beta Subunits definition: They are glycopeptides and subunits in INHIBINS and ACTIVINS. Inhibins and activins belong to the transforming growth factor beta superfamily.
Protein Subunits definition: Single chains of amino acids that are the units of multimeric PROTEINS. Multimeric proteins can be composed of identical or non-identical subunits. One or more monomeric subunits may compose a protomer which itself is a subunit structure of a larger assembly.
Catalytic Domain definition: The region of an enzyme that interacts with its substrate to cause the enzymatic reaction.
Adaptor Protein Complex Subunits definition: The subunits that make up the large, medium and small chains of adaptor proteins.
Integrin alpha Chains definition: The alpha subunits of integrin heterodimers (INTEGRINS), which mediate ligand specificity. There are approximately 18 different alpha chains, exhibiting great sequence diversity; several chains are also spliced into alternative isoforms. They possess a long extracellular portion (1200 amino acids) containing a MIDAS (metal ion-dependent adhesion site) motif, and seven 60-amino acid tandem repeats, the last 4 of which form EF HAND MOTIFS. The intracellular portion is short with the exception of INTEGRIN ALPHA4.
Integrin beta Chains definition: Integrin beta chains combine with integrin alpha chains to form heterodimeric cell surface receptors. Integrins have traditionally been classified into functional groups based on the identity of one of three beta chains present in the heterodimer. The beta chain is necessary and sufficient for integrin-dependent signaling. Its short cytoplasmic tail contains sequences critical for inside-out signaling.
large ribosomal subunit definition: The larger of the two subunits of a ribosome. Two sites on the ribosomal large subunit are involved in translation, namely the aminoacyl site (A site) and peptidyl site (P site). [ISBN:0198506732 "Oxford Dictionary of Biochemistry and Molecular Biology"]
Ribosome Subunits, Large definition: The largest ribonucleoprotein component of RIBOSOMES. It contains the domains which catalyze formation of the peptide bond and translocation of the ribosome along the MESSENGER RNA during GENETIC TRANSLATION.
small ribosomal subunit definition: The smaller of the two subunits of a ribosome. [GOC:mah]
Ribosome Subunits, Small definition: The small ribonucleoprotein component of RIBOSOMES. It contains the MESSENGER RNA binding site and two TRANSFER RNA binding sites - one for the incoming AMINO ACYL TRNA (A site) and the other (P site) for the peptidyl tRNA carrying the elongating peptide chain.
Immunoglobulin Subunits definition: The PROTEIN SUBUNITS of the multimeric IMMUNOGLOBULIN proteins, such as IGA; IGD; IGE; IGG; and IGM. Included are the heavy and light chains which contain the specific ANTIGEN binding domains, as well as the accessory proteins that are part of the the secreted forms of IGM and IGA; (SECRETORY IGA).
Large-Conductance Calcium-Activated Potassium Channel beta Subunits definition: The regulatory subunits of large-conductance calcium-activated potassium channels.
Ribosome Subunits, Large, Eukaryotic definition: The large subunit of the 80s ribosome of eukaryotes. It is composed of the 28S RIBOSOMAL RNA, the 5.8S RIBOSOMAL RNA, the 5S RIBOSOMAL RNA, and about 50 different RIBOSOMAL PROTEINS.
Ribosome Subunits, Small, Eukaryotic definition: The small subunit of the 80s ribosome of eukaryotes. It is composed of the 18S RIBOSOMAL RNA and 32 different RIBOSOMAL PROTEINS.
Ribosome Subunits definition: The two dissimilar sized ribonucleoprotein complexes that comprise a RIBOSOME - the large ribosomal subunit and the small ribosomal subunit. The eukaryotic 80S ribosome is composed of a 60S large subunit and a 40S small subunit. The bacterial 70S ribosome is composed of a 50S large subunit and a 30S small subunit.
ribosomal subunit definition: Either of the two ribonucleoprotein complexes that associate to form a ribosome. [GOC:mah]
Ribosome Subunits, Small, Bacterial definition: The small subunit of eubacterial RIBOSOMES. It is composed of the 16S RIBOSOMAL RNA and about 23 different RIBOSOMAL PROTEINS.
Ribosome Subunits, Large, Bacterial definition: The large subunit of the eubacterial 70s ribosome. It is composed of the 23S RIBOSOMAL RNA, the 5S RIBOSOMAL RNA, and about 37 different RIBOSOMAL PROTEINS.
Ribosome Subunits, Large, Archaeal definition: The large subunit of the archaeal 70s ribosome. It is composed of the 23S RIBOSOMAL RNA, the 5S RIBOSOMAL RNA, and about 40 different RIBOSOMAL PROTEINS.
Ribosome Subunits, Small, Archaeal definition: The small subunit of archaeal RIBOSOMES. It is composed of the 16S RIBOSOMAL RNA and about 28 different RIBOSOMAL PROTEINS.
Cyclic AMP-Dependent Protein Kinase Catalytic Subunits definition: Specific enzyme subunits that form the active sites of the type I and type II cyclic-AMP protein kinases. Each molecule of enzyme contains two catalytic subunits.
Hemoglobin Subunits definition: The PROTEIN SUBUNITS that comprise multimeric HEMOGLOBINS.