The process of creating protein oligomers, compounds composed of a small number, usually between three and ten, of identical component monomers. Oligomers may be formed by the polymerization of a number of monomers or the depolymerization of a large protein polymer.

The directed movement of beta-alanine, 3-aminopropanoic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of L-alanine, the L-enantiomer of 2-aminopropanoic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of glycine, aminoethanoic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of D-alanine, the D-enantiomer of 2-aminopropanoic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of D-serine, the D-enantiomer of 2-amino-3-hydroxypropanoic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus indicating damage to its DNA from environmental insults or errors during metabolism.

The directed movement of phenylalanine, 2-amino-3-phenylpropanoic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of phenylalanine, 2-amino-3-phenylpropanoic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of tryptophan, 2-amino-3-(1H-indol-3-yl)propanoic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of tyrosine, 2-amino-3-(4-hydroxyphenyl)propanoic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of tyrosine, 2-amino-3-(4-hydroxyphenyl)propanoic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of amino acids, organic acids containing one or more amino substituents, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The chemical reactions and pathways resulting in the formation of beta-alanine (3-aminopropanoic acid), an achiral amino acid and an isomer of alanine. It occurs free (e.g. in brain) and in combination (e.g. in pantothenate) but it is not a constituent of proteins.

The directed movement of a L-arginine into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The chemical reactions and pathways involving arginine, 2-amino-5-(carbamimidamido)pentanoic acid.

The directed movement of amino acids, organic acids containing one or more amino substituents, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of amino acids, organic acids containing one or more amino substituents, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The process in which a solute is transported across a lipid bilayer, from one side of a membrane to the other.

The process in which an amino acid is transported across a membrane.

The directed movement of L-cystine (also known as dicysteine) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

A series of processes that forms an integrated mechanism by which a cell or an organism detects the depletion of primary sulfur sources and then activates genes to scavenge the last traces of the primary sulfur source and to transport and metabolize alternate sulfur sources. The utilization process begins when the cell or organism detects sulfur levels, includes the activation of genes whose products detect, transport or metabolize sulfur-containing compounds, and ends when the sulfur is incorporated into the cell or organism's metabolism.

The chemical reactions and pathways resulting in the formation of methionine (2-amino-4-(methylthio)butanoic acid), a sulfur-containing, essential amino acid found in peptide linkage in proteins.

The directed movement of S-methylmethionine into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The directed movement of leucine from outside of a cell, across the plasma membrane and into the cytosol.

The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.

The component of the plasma membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.

The component of the plasma membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.

The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite.

The irregular network of unit membranes, visible only by electron microscopy, that occurs in the cytoplasm of many eukaryotic cells. The membranes form a complex meshwork of tubular channels, which are often expanded into slitlike cavities called cisternae. The ER takes two forms, rough (or granular), with ribosomes adhering to the outer surface, and smooth (with no ribosomes attached).

The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.

The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.

A compound membranous cytoplasmic organelle of eukaryotic cells, consisting of flattened, ribosome-free vesicles arranged in a more or less regular stack. The Golgi apparatus differs from the endoplasmic reticulum in often having slightly thicker membranes, appearing in sections as a characteristic shallow semicircle so that the convex side (cis or entry face) abuts the endoplasmic reticulum, secretory vesicles emerging from the concave side (trans or exit face). In vertebrate cells there is usually one such organelle, while in invertebrates and plants, where they are known usually as dictyosomes, there may be several scattered in the cytoplasm. The Golgi apparatus processes proteins produced on the ribosomes of the rough endoplasmic reticulum; such processing includes modification of the core oligosaccharides of glycoproteins, and the sorting and packaging of proteins for transport to a variety of cellular locations. Three different regions of the Golgi are now recognized both in terms of structure and function: cis, in the vicinity of the cis face, trans, in the vicinity of the trans face, and medial, lying between the cis and trans regions.

The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.