Nutrition Guide

SAP97's protein structure consists of an alternatively-spliced n-terminal domain, three PDZ domains, an SH3 domain, hook domain, I3 domain, and finally an inactive guanylate kinase (GK) domain. Each of these domains has specific interacting partners that help define SAP97's unique function. The n-terminal of SAP97 can be alternatively spliced to contain a double-cysteine/palmitoylation site (?-isoform), or an L27 domain (?-isoform. The L27 domain is involved in SAP97 oligomerization with other SAP97 molecules, CASK, and other L27-domain-containing proteins.[6]. There is also a myosin VI binding site near n-terminal which may be involved in the internalization of AMPAR.[7][8] Each of SAP97's PDZ domains have

SAP97 is a mammalian MAGUK-family member protein that is similar to the Drosophila protein Dlg1 (the protein is alternatively referred to as hDlg1, and the human gene is DLG1). SAP97 is expressed throughout the body in epithelial cells. In the brain it is involved in the trafficking of ionotropic receptors from the Endoplasmic Reticulum to the plasma membrane, and may be involved in the trafficking AMPAR during synaptic plasticity.

The PDZ domain is a common structural domain of 80-90 amino-acids found in the signaling proteins of bacteria, yeast, plants, and animals[1]. PDZ is an acronym combining the first letters of three proteins — post synaptic density protein (PSD95), Drosophila disc large tumor suppressor (DlgA), and zonula occludens-1 protein (zo-1) — which were first discovered to share the domain. PDZ domains are also referred to as DHR (Dlg homologous region) or GLGF (glycine-leucine-glycine-phenylalanine) domains. These domains help anchor transmembrane proteins to the cytoskeleton and hold together signaling complexes[2]. There are roughly 260 human PDZ domains, though since several PDZ domain containing

The main function of crystallins at least in the lens of the eye is probably to increase the refractive index while not obstructing light. However, this is not their only function. It is becoming increasingly clear that crystallins may have a several metabolic and regulatory functions, both within the lens and in other parts of the body [5].

The protein has no known natural ligand[2] and its function is unclear. It is suspected that it acts as a calcium channel in the cell membran

ER-? may have anti-proliferative effects and therefore oppose the actions of ER-? in reproductive tissue.[4] ER-? may also have an important role in adpative function of the lung during pregnancy.[5]

There is a vast array of studies investingating the function of "membrane channels", these frequently combine the patch clamp technique with pharmacology. The process by which membrane channel function is altered by drugs and biochemicals is termed "channel modulation". Functional channelomic studies also includes study of diseases resulting from their mis-function. Such a disease is termed a channelopathy.

The precise function of the prion protein is not known, but there is substantial evidence that it serves as a copper-dependent antioxidant.[

The function of sphingomyelin remained unclear until recently when it was found to have a function in signal transduction. The plasma membrane of cells is highly enriched in sphingomyelin and is considered largely to be found in the exoplasmic leaflet of the cell membrane. However, there is some evidence that there may also be a sphingomyelin pool in the inner leaflet of the membrane [1] [2]. Moreover, neutral sphingomyelinase-2 - an enzyme that breaks down sphingomyelin into ceramide has been found to localise exclusively to the inner leaflet further suggesting that there may be sphingomyelin present there.

SNARE proteins are the key components of the molecular machinery that drives fusion of membranes in exocytosis. Their function however is subject to fine tuning by various regulatory protein collectively referred to as SNARE masters.

Centrin is required for duplication of centrioles.[2] It may also play a role in severing of microtubules by causing calcium-mediated contraction.[3] The majority of centrin in the cell is non-centrosomal whose function is not yet clear.[4]

The key requirement in understanding protein function is to learn to correlate the vast array of potential protein modifications to particular phenotypic settings, and then determine if a particular post-translational modification is required for a function to occur

The function of Thy-1 has not yet been fully elucidated. It has speculated roles in cell-cell and cell-matrix interactions, with implication in neurite outgrowth, nerve regeneration, apoptosis, metastasis, inflammation, and fibrosis.

Functional gum is the name given to types of chewing gum which impart some practical function instead of, or in addition to, the usual enjoyment provided by a traditional chewing gum as a confectionery product. Examples of this include Nicotine gum which is used to aid smoking cessation, so-called "dental gum" made by toothpaste manufacturers that provide some of the benefits of tooth brushing, caffeinated gum to help alertness and even Think Gum which designers say they believe may enhance mental functioning. It could be argued that most gum (at least the mint varieties) provides some function in that they

Recent evidence suggests RRF may accomplish the recycling of ribosomes by splitting ribosomes into subunits, thereby releasing the bound mRNA[5]. Loss of RRF Function: In Bacteria (specifically Escherichia coli), loss of the gene encoding RRF is deleterious [6]. This makes RRF a possible target for new antibacterial drugs. Yeast mitochondrial RRF (mtRRF) is encoded by a gene in the cell nucleus. Loss of function of this gene leads to mitochondrial genome instability and respiratory incompetence [7].

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