Protein found in or associated with the bacterial cell inner membrane, a selectively permeable membrane which separates the cytoplasm from the periplasm in Gram-negative bacterial cells.

Category: Cellular component · UniProtKB (161,032)

Protein found in or associated with the cell membrane, a selectively permeable membrane which separates the cytoplasm from its surroundings. In most archaea, bacteria, fungi, plants, and algae the cell membrane is enclosed by at least the cell wall. Also used when it is not known if the protein is found in or associated with the inner or outer cell membrane.

Category: Cellular component · UniProtKB (1,007,229)

Protein found in or associated with the bacterial cell outer membrane, a selectively permeable membrane which separates the bacterial periplasm from the Gram-negative bacterial cell surroundings. In most bacteria, the cell membrane is enclosed by at least the cell wall.

Category: Cellular component · UniProtKB (50,286)

Protein found in or associated with a cell protrusion such as pseudopodium, filopodium, lamellipodium, growth cone, flagellum, acrosome or axon, or bacterial comet tail. These membrane-cytoskeleton-coupled processes are involved in many biological functions, such as cell motility, cancer-cell invasion, endocytosis, phagocytosis, exocytosis, pathogen infection, neurite extension and cytokinesis.

Category: Cellular component · UniProtKB (136,998)

Protein found in or associated with a complex and rigid layer surrounding the cell. Cell walls are found in bacteria, archaea, fungi, plants, and algae. The cell wall is surrounded by the outer membrane in gram-negative bacteria, and envelopes the inner or plasma membrane in gram-negative, gram-positive and acid-fast bacteria. Cell walls of bacteria contain peptidoglycan whereas those of archaea do not. Some archaea may contain pseudopeptidoglycan, which is composed of N-acetyltalosaminuronic acid, instead of N-acetyl muramic acid in peptidoglycan. The plant cell wall is made of fibrils of cellulose embedded in a matrix of several other kinds of polymers such as pectin and lignin. Algal cell walls are usually composed of cellulose, glycoproteins, sporopollenin, calcium and various polysaccharides such as manosyl, xylanes, alginic acid. Diatom cell walls (or frustules) contain silica. The cell wall plays a role in cell shape, cell stability and development, and protection against environmental dangers.

Category: Cellular component · UniProtKB (12,498)

Protein which is involved in the formation, organization, maintenance or degradation of the cell wall. The cell wall is an extracellular layer outside the cell membrane which protects the cell against mechanical damage, osmotic strength and which determines the cell shape. It is prominent in most plants, algae, bacteria and fungi.

Category: Biological process · UniProtKB (90,975)

Viral protein involved in the merging of the virus envelope with host plasma membrane during viral penetration into host cell. Virus fusion proteins drive this fusion reaction by undergoing a major conformational change that is triggered by interactions with the target cell. This pathway is used by viruses whose fusion protein is usually pH independent such as most paramyxoviruses, herpesviruses and retroviruses. MHV-JHM coronavirus has been shown to fuse directly with the host plasma membrane.

Category: Biological process · UniProtKB (8,310)

Protein found in or associated with the bacterial host cell inner membrane, the selectively permeable membrane which separates the host cytoplasm from the host periplasm in Gram-negative host bacterial cells. a selectively permeable membrane which separates the cytoplasm from the periplasm in Gram-negative bacterial cells.

Category: Cellular component · UniProtKB (9)

Protein found in or associated with the host cell membrane, the selectively permeable membrane which separates the host cytoplasm from its surroundings.

Category: Cellular component · UniProtKB (177,269)

Protein found in or associated with the bacterial host cell outer membrane, the selectively permeable membrane which separates the bacterial host periplasm from the Gram-negative host bacterial cell surroundings. In most bacteria, the cell membrane is enclosed by at least the cell wall.

Category: Cellular component · UniProtKB (4)

Protein found in or associated with a host cell projection, a host cell protrusion such as pseudopodium, filopodium, lamellipodium, growth cone, flagellum, acrosome, axon, pili or bacterial comet tail. These membrane-cytoskeleton-coupled processes are involved in many biological functions, such as host cell motility, cancer-cell invasion, endocytosis, phagocytosis, exocytosis, pathogen infection, neurite extension and cytokinesis.

Category: Cellular component · UniProtKB (17)

Viral protein involved in interaction with bacterial conjugative F-pili, which are retractile filaments that protrude from gram-negative bacteria and normally mediate horizontal gene transfer. Binding to the pilus is followed by retraction of the pilus, which brings the bacteriophage in contact with the host cell membrane. Examples of bacteriophages which utilize the host-cell pilus as an attachment structure are bacteriophages M13, f1, fd, R17, Qbeta, Pf1, Pf3, phiKMV or phi6.

Category: Biological process · UniProtKB (15)

Viral pore-forming protein, associated with the viral capsid, that induces the formation of a transmembrane pore in the host membrane to allow the viral genome to enter the cytoplasm. This mechanism is used by non-enveloped viruses such as human rhinovirus 2, poliovirus, and some bacteriophages.

Category: Biological process · UniProtKB (8)

Protein characteristic of the postsynaptic membrane. In a chemical synapse, the postsynaptic membrane is the membrane that receives a signal (binds neurotransmitter) from the presynaptic cell and responds via depolarisation or hyperpolarisation. The postsynaptic membrane is separated from the presynaptic membrane by the synaptic cleft.

Category: Cellular component · UniProtKB (6,534)

Protein found in or associated with a target cell membrane, the selectively permeable membrane which separates the target cell cytoplasm from its surroundings. This term is used to describe a toxin located to the cell membrane of a target cell.

Category: Cellular component · UniProtKB (119)