Myelin basic protein

Last updated
MBP
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases MBP , myelin basic protein
External IDs OMIM: 159430 MGI: 96925 HomoloGene: 1788 GeneCards: MBP
Orthologs
SpeciesHumanMouse
Entrez

4155

17196

Ensembl

ENSG00000197971

ENSMUSG00000041607

UniProt

P02686

P04370

RefSeq (mRNA)
RefSeq (protein)
Location (UCSC) Chr 18: 76.98 – 77.13 Mb Chr 18: 82.49 – 82.6 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse
Myelin_MBP
Identifiers
SymbolMyelin_MBP
Pfam PF01669
InterPro IPR000548
PROSITE PDOC00492
SCOP2 1bx2 / SCOPe / SUPFAM
OPM superfamily 274
OPM protein 2lug
Available protein structures:
Pfam   structures / ECOD  
PDB RCSB PDB; PDBe; PDBj
PDBsum structure summary

Myelin basic protein (MBP) is a protein believed to be important in the process of myelination of nerves in the nervous system. The myelin sheath is a multi-layered membrane, unique to the nervous system, that functions as an insulator to greatly increase the velocity of axonal impulse conduction. [5] MBP maintains the correct structure of myelin, interacting with the lipids in the myelin membrane. [6] [7]

Contents

MBP was initially sequenced in 1971 after isolation from bovine myelin membranes. [8] MBP knockout mice called shiverer mice were subsequently developed and characterized in the early 1980s. Shiverer mice exhibit decreased amounts of CNS myelination and a progressive disorder characterized by tremors, seizures, and early death. The human gene for MBP is on chromosome 18; [9] the protein localizes to the CNS and to various cells of the hematopoietic lineage.

The pool of MBP in the central nervous system is very diverse, with several splice variants being expressed and a large number of post-translational modifications on the protein, which include phosphorylation, methylation, deamidation, and citrullination. These forms differ by the presence or the absence of short (10 to 20 residues) peptides in various internal locations in the sequence. In general, the major form of MBP is a protein of about 18.5 Kd (170 residues).

In melanocytic cell types, MBP gene expression may be regulated by MITF. [10]

Gene expression

The protein encoded by the classic MBP gene is a major constituent of the myelin sheath of oligodendrocytes and Schwann cells in the nervous system. However, MBP-related transcripts are also present in the bone marrow and the immune system. These mRNAs arise from the long MBP gene (otherwise called "Golli-MBP") that contains three additional exons located upstream of the classic MBP exons. Alternative splicing from the Golli and the MBP transcription start sites gives rise to two sets of MBP-related transcripts and gene products. The Golli mRNAs contain three exons unique to Golli-MBP, spliced in-frame to one or more MBP exons. They encode hybrid proteins that have an N-terminal Golli amino acid sequence linked to the MBP amino acid sequence. The second family of transcripts contains only MBP exons and produces the well-characterized myelin basic proteins. This complex gene structure is conserved among species, suggesting that the MBP transcription unit is an integral part of the Golli transcription unit and that this arrangement is important for the function and/or regulation of these genes. [11] At protein level, the concentration of MBP in the CNS is tenfold higher in sections of white matter compared with cerebral cortex. [12]

Structure

MBP charge and citrullination MBP Charge and Citrullination.png
MBP charge and citrullination

Myelin basic protein has been classified as an intrinsically disordered protein that has no stable secondary structure in solution. [13] Like most IDPs, it has a high net charge and a low mean hydrophobicity, minimizing the hydrophobic effect that drives traditional protein folding. It does contain some exceptions to normal IDP amino acid content. For example, MBP has more arginine and less glutamic acid than most IDPs. However, this is likely because those changes are necessary for MBP to be sufficiently basic and positively charged to correctly interact with the membrane. [14] Notably, MBP has been shown to adopt a more stable secondary structure on interaction with lipids. [15] [16] NMR and Cys-specific spin labeling experiments have predicted this structure to contain beta sheet and regions of amphipathic helix. [17]

As implied by its name, myelin basic protein is significantly basic, with an isoelectric point of 10. It is thought to associate with the cell membrane through electrostatic interactions between its positive charges and negatively charged phospholipid heads of the plasma membrane. [18] It can undergo a large variety of post-translational modifications, creating various charge isomers known as C1-C6 or C8. [19] These modifications include phosphorylation, methylation, deamidation, citrullination, ADP-ribosylation, and N-terminal acylation . C1 is the least modified, while C8 is the most distinct, containing 6-11 additional citrullinations. Since each of these decreases its positive charge, C8 has the smallest net positive charge of the isomers. Alternations in these post-translational modifications have been associated with demyelinating diseases. Notably, MBP isolated from individuals with multiple sclerosis have had a higher degree of citrullination and a smaller positive charge. In a rare, severe form of MS known as Marburg's syndrome, the citrullination was even more extensive. [18]

Role in disease

Interest in MBP has centered on its role in demyelinating diseases, in particular, multiple sclerosis (MS). The target antigen of the autoimmune response in MS has not yet been identified. However, several studies have shown a role for antibodies against MBP in the pathogenesis of MS. [20] Some studies have linked a genetic predisposition to MS to the MBP gene, though a majority have not.

A "molecular mimicry" hypothesis of multiple sclerosis has been suggested, in which T cells are, in essence, confusing MBP with human herpesvirus-6. Researchers in the United States created a synthetic peptide with a sequence identical to that of an HHV-6 peptide. Elevated levels of MBP have been found in the cerebrospinal fluid of patients with HIV infections and signs of encephalopathy, and although MBP does not seem to be a sensitive diagnostic marker of HIV encephalopathy, it has been suggested that it may serve a role as a prognostic indicator of disease progression. [21] It is able to show that T cells were activated by this peptide. These activated T cells also recognized and initiated an immune response against a synthetically created peptide sequence that is identical to part of human MBP. During their research, they found that the levels of these cross-reactive T cells are significantly elevated in multiple sclerosis patients. [22]

HIV-induced autoimmun-antiMyelin Antibodies against human nerve tissue (FITC-Stain).jpg

Some research has shown that inoculating an animal with MBP to generate an MBP-specific immune response against it increases blood–brain barrier permeability. Permeability is enhanced when the animal is inoculated against non-specific proteins. [23]

A targeted immune response to MBP has been implicated in lethal rabies infection. The inoculation of MBP generates increases the permeability of the blood–brain barrier (BBB), allowing immune cells to enter the brain, the primary site of rabies virus replication. In a study of mice infected with Silver-haired bat rabies virus (SHBRV), the mortality rate of mice treated with MBP improved 20%-30% over the untreated control group. It is significant to note that healthy uninfected mice treated with MBP showed an increase in mortality rate between 0% and 40%. [24]

Interactions

Myelin basic protein has been shown to interact in vivo with proteolipid protein 1, [25] [26] and in vitro with calmodulin, actin, tropomyosin, tubulin, clathrin, 2',3'-cyclic-nucleotide 3'-phosphodiesterase and multiple molecules of the immune system. [27]

Related Research Articles

<span class="mw-page-title-main">Myelin</span> Fatty substance that surrounds nerve cell axons to insulate them and increase transmission speed

Myelin is a lipid-rich material that surrounds nerve cell axons to insulate them and increase the rate at which electrical impulses pass along the axon. The myelinated axon can be likened to an electrical wire with insulating material (myelin) around it. However, unlike the plastic covering on an electrical wire, myelin does not form a single long sheath over the entire length of the axon. Rather, myelin ensheaths the axon segmentally: in general, each axon is encased in multiple long sheaths with short gaps between, called nodes of Ranvier. At the nodes of Ranvier, which are approximately one thousandth of a mm in length, the axon's membrane is bare of myelin.

<span class="mw-page-title-main">Peripherin</span> Protein-coding gene in the species Homo sapiens

Peripherin is a type III intermediate filament protein expressed mainly in neurons of the peripheral nervous system. It is also found in neurons of the central nervous system that have projections toward peripheral structures, such as spinal motor neurons. Its size, structure, and sequence/location of protein motifs is similar to other type III intermediate filament proteins such as desmin, vimentin and glial fibrillary acidic protein. Like these proteins, peripherin can self-assemble to form homopolymeric filamentous networks, but it can also heteropolymerize with neurofilaments in several neuronal types. This protein in humans is encoded by the PRPH gene. Peripherin is thought to play a role in neurite elongation during development and axonal regeneration after injury, but its exact function is unknown. It is also associated with some of the major neuropathologies that characterize amyotropic lateral sclerosis (ALS), but despite extensive research into how neurofilaments and peripherin contribute to ALS, their role in this disease is still unidentified.

Experimental autoimmune encephalomyelitis, sometimes experimental allergic encephalomyelitis (EAE), is an animal model of brain inflammation. It is an inflammatory demyelinating disease of the central nervous system (CNS). It is mostly used with rodents and is widely studied as an animal model of the human CNS demyelinating diseases, including multiple sclerosis (MS) and acute disseminated encephalomyelitis (ADEM). EAE is also the prototype for T-cell-mediated autoimmune disease in general.

<span class="mw-page-title-main">Citrullination</span> Biological process

Citrullination or deimination is the conversion of the amino acid arginine in a protein into the amino acid citrulline. Citrulline is not one of the 20 standard amino acids encoded by DNA in the genetic code. Instead, it is the result of a post-translational modification. Citrullination is distinct from the formation of the free amino acid citrulline as part of the urea cycle or as a byproduct of enzymes of the nitric oxide synthase family.

Molecular mimicry is the theoretical possibility that sequence similarities between foreign and self-peptides are enough to result in the cross-activation of autoreactive T or B cells by pathogen-derived peptides. Despite the prevalence of several peptide sequences which can be both foreign and self in nature, just a few crucial residues can activate a single antibody or TCR. This highlights the importance of structural homology in the theory of molecular mimicry. Upon activation, these "peptide mimic" specific T or B cells can cross-react with self-epitopes, thus leading to tissue pathology (autoimmunity). Molecular mimicry is one of several ways in which autoimmunity can be evoked. A molecular mimicking event is more than an epiphenomenon despite its low probability, and these events have serious implications in the onset of many human autoimmune disorders.

<span class="mw-page-title-main">CCL7</span> Mammalian protein found in Homo sapiens

Chemokine ligand 7 (CCL7) is a small cytokine that was previously called monocyte-chemotactic protein 3 (MCP3). CCL7 is a small protein that belongs to the CC chemokine family and is most closely related to CCL2.

<span class="mw-page-title-main">Natriuretic peptide</span> Hormone used in regulating the cardiovascular system

A natriuretic peptide is a hormone molecule that plays a crucial role in the regulation of the cardiovascular system. These hormones were first discovered in the 1980s and were found to have very strong diuretic, natriuretic, and vasodilatory effects. There are three main types of natriuretic peptides: atrial natriuretic peptide (ANP), brain natriuretic peptide (BNP), and C-type natriuretic peptide (CNP). Two minor hormones include Urodilatin (URO) which is processed in the kidney and encoded by the same gene as ANP, and Dendroaspis NP (DNP) that was discovered through isolation of the venom from the green mamba snake. Since they are activated during heart failure, they are important for the protection of the heart and its tissues.

<span class="mw-page-title-main">Ketogenic amino acid</span> Type of amino acid

A ketogenic amino acid is an amino acid that can be degraded directly into acetyl-CoA, which is the precursor of ketone bodies and myelin, particularly during early childhood, when the developing brain requires high rates of myelin synthesis. This is in contrast to the glucogenic amino acids, which are converted into glucose. Ketogenic amino acids are unable to be converted to glucose as both carbon atoms in the ketone body are ultimately degraded to carbon dioxide in the citric acid cycle.

<span class="mw-page-title-main">Proteolipid protein 1</span> Type of myelin-associated protein

Proteolipid protein 1 (PLP1) is a form of myelin proteolipid protein (PLP). Mutations in PLP1 are associated with Pelizaeus–Merzbacher disease. It is a 4 transmembrane domain protein which is proposed to bind other copies of itself on the extracellular side of the membrane. In a myelin sheath, as the layers of myelin wraps come together, PLP will bind itself and tightly hold the cellular membranes together.

<span class="mw-page-title-main">Myelin protein zero</span> Protein-coding gene in the species Homo sapiens

Myelin protein zero is a single membrane glycoprotein which in humans is encoded by the MPZ gene. P0 is a major structural component of the myelin sheath in the peripheral nervous system (PNS). Myelin protein zero is expressed by Schwann cells and accounts for over 50% of all proteins in the peripheral nervous system, making it the most common protein expressed in the PNS. Mutations in myelin protein zero can cause myelin deficiency and are associated with neuropathies like Charcot–Marie–Tooth disease and Dejerine–Sottas disease.

<span class="mw-page-title-main">Carboxypeptidase E</span> Enzyme found in humans

Carboxypeptidase E (CPE), also known as carboxypeptidase H (CPH) and enkephalin convertase, is an enzyme that in humans is encoded by the CPE gene. This enzyme catalyzes the release of C-terminal arginine or lysine residues from polypeptides.

<span class="mw-page-title-main">Dirucotide</span> Chemical compound

Dirucotide (also known as MBP8298) was developed by two research scientists (Dr. Kenneth G. Warren, MD, FRCP(C) & Ingrid Catz, Senior Scientist) at the University of Alberta for the treatment of Multiple Sclerosis (MS). Dirucotide is a synthetic peptide that consists of 17 amino acids linked in a sequence identical to that of a portion of human myelin basic protein (MBP). The sequence of these 17 amino acids is

<span class="mw-page-title-main">Formyl peptide receptor 2</span> Protein-coding gene in the species Homo sapiens

N-formyl peptide receptor 2 (FPR2) is a G-protein coupled receptor (GPCR) located on the surface of many cell types of various animal species. The human receptor protein is encoded by the FPR2 gene and is activated to regulate cell function by binding any one of a wide variety of ligands including not only certain N-Formylmethionine-containing oligopeptides such as N-Formylmethionine-leucyl-phenylalanine (FMLP) but also the polyunsaturated fatty acid metabolite of arachidonic acid, lipoxin A4 (LXA4). Because of its interaction with lipoxin A4, FPR2 is also commonly named the ALX/FPR2 or just ALX receptor.

<span class="mw-page-title-main">Corticotropin-releasing hormone receptor 2</span> Protein found in humans

Corticotropin-releasing hormone receptor 2 (CRHR2) is a protein, also known by the IUPHAR-recommended name CRF2, that is encoded by the CRHR2 gene and occurs on the surfaces of some mammalian cells. CRF2 receptors are type 2 G protein-coupled receptors for corticotropin-releasing hormone (CRH) that are resident in the plasma membranes of hormone-sensitive cells. CRH, a peptide of 41 amino acids synthesized in the hypothalamus, is the principal neuroregulator of the hypothalamic-pituitary-adrenal axis, signaling via guanine nucleotide-binding proteins (G proteins) and downstream effectors such as adenylate cyclase. The CRF2 receptor is a multi-pass membrane protein with a transmembrane domain composed of seven helices arranged in a V-shape. CRF2 receptors are activated by two structurally similar peptides, urocortin II, and urocortin III, as well as CRH.

<span class="mw-page-title-main">Hydroxycarboxylic acid receptor 2</span> Protein-coding gene in the species Homo sapiens

Hydroxycarboxylic acid receptor 2 (HCA2), also known as GPR109A and niacin receptor 1 (NIACR1), is a protein which in humans is encoded (its formation is directed) by the HCAR2 gene and in rodents by the Hcar2 gene. The human HCAR2 gene is located on the long (i.e., "q") arm of chromosome 12 at position 24.31 (notated as 12q24.31). Like the two other hydroxycarboxylic acid receptors, HCA1 and HCA3, HCA2 is a G protein-coupled receptor (GPCR) located on the surface membrane of cells. HCA2 binds and thereby is activated by D-β-hydroxybutyric acid (hereafter termed β-hydroxybutyric acid), butyric acid, and niacin (also known as nicotinic acid). β-Hydroxybutyric and butyric acids are regarded as the endogenous agents that activate HCA2. Under normal conditions, niacin's blood levels are too low to do so: it is given as a drug in high doses in order to reach levels that activate HCA2.

<span class="mw-page-title-main">MMP28</span> Protein-coding gene in the species Homo sapiens

Matrix metalloproteinase 28 also known as epilysin is an enzyme that in humans is encoded by the MMP28 gene.

<span class="mw-page-title-main">2',3'-Cyclic-nucleotide 3'-phosphodiesterase</span> Protein-coding gene in the species Homo sapiens

2′,3′-Cyclic-nucleotide 3'-phosphodiesterase is an enzyme that in humans is encoded by the CNP gene.

<span class="mw-page-title-main">Cecropin</span>

Cecropins are antimicrobial peptides. They were first isolated from the hemolymph of Hyalophora cecropia, whence the term cecropin was derived. Cecropins lyse bacterial cell membranes; they also inhibit proline uptake and cause leaky membranes.

<span class="mw-page-title-main">Myelin regulatory factor</span> Mammalian protein found in Homo sapiens

Myelin regulatory factor, also known as myelin gene regulatory factor (MRF), is a protein that in humans is encoded by the MYRF gene.

<span class="mw-page-title-main">Formyl peptide receptor 1</span> Protein-coding gene in the species Homo sapiens

Formyl peptide receptor 1 is a cell surface receptor protein that in humans is encoded by the formyl peptide receptor 1 (FPR1) gene. This gene encodes a G protein-coupled receptor cell surface protein that binds and is activated by N-Formylmethionine-containing oligopeptides, particularly N-Formylmethionine-leucyl-phenylalanine (FMLP). FPR1 is prominently expressed by mammalian phagocytic and blood leukocyte cells where it functions to mediate these cells' responses to the N-formylmethionine-containing oligopeptides which are released by invading microorganisms and injured tissues. FPR1 directs these cells to sites of invading pathogens or disrupted tissues and then stimulates these cells to kill the pathogens or to remove tissue debris; as such, it is an important component of the innate immune system that operates in host defense and damage control.

References

  1. 1 2 3 GRCh38: Ensembl release 89: ENSG00000197971 – Ensembl, May 2017
  2. 1 2 3 GRCm38: Ensembl release 89: ENSMUSG00000041607 – Ensembl, May 2017
  3. ↑ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ↑ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ↑ Sakamoto Y, Kitamura K, Yoshimura K, Nishijima T, Uyemura K (March 1987). "Complete amino acid sequence of PO protein in bovine peripheral nerve myelin". The Journal of Biological Chemistry. 262 (9): 4208–4214. doi: 10.1016/S0021-9258(18)61334-1 . PMID   2435734.
  6. ↑ Deber CM, Reynolds SJ (April 1991). "Central nervous system myelin: structure, function, and pathology". Clinical Biochemistry. 24 (2): 113–134. doi:10.1016/0009-9120(91)90421-a. PMC   7130177 . PMID   1710177.
  7. ↑ Inouye H, Kirschner DA (January 1991). "Folding and function of the myelin proteins from primary sequence data". Journal of Neuroscience Research. 28 (1): 1–17. doi:10.1002/jnr.490280102. PMID   1710279. S2CID   8598890.
  8. ↑ Eylar EH, Brostoff S, Hashim G, Caccam J, Burnett P (September 1971). "Basic A1 protein of the myelin membrane. The complete amino acid sequence". The Journal of Biological Chemistry. 246 (18): 5770–5784. doi: 10.1016/S0021-9258(18)61872-1 . PMID   5096093.
  9. ↑ Saxe DF, Takahashi N, Hood L, Simon MI (1985). "Localization of the human myelin basic protein gene (MBP) to region 18q22----qter by in situ hybridization". Cytogenetics and Cell Genetics. 39 (4): 246–249. doi:10.1159/000132152. PMID   2414074.
  10. ↑ Hoek KS, Schlegel NC, Eichhoff OM, Widmer DS, Praetorius C, Einarsson SO, et al. (December 2008). "Novel MITF targets identified using a two-step DNA microarray strategy". Pigment Cell & Melanoma Research. 21 (6): 665–676. doi: 10.1111/j.1755-148X.2008.00505.x . PMID   19067971. S2CID   24698373.
  11. ↑ "Entrez Gene: myelin basic protein".
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  14. ↑ Harauz G, Ishiyama N, Hill CM, Bates IR, Libich DS, Farès C (May 2004). "Myelin basic protein-diverse conformational states of an intrinsically unstructured protein and its roles in myelin assembly and multiple sclerosis". Micron. 35 (7): 503–542. doi:10.1016/s0968-4328(04)00096-4. PMID   15219899.
  15. ↑ Moroi K, Sato T (August 1975). "Comparison between procaine and isocarboxazid metabolism in vitro by a liver microsomal amidase-esterase". Biochemical Pharmacology. 24 (16): 1517–1521. doi:10.1016/0006-2952(75)90029-5. PMID   8.
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  17. ↑ Bates IR, Feix JB, Boggs JM, Harauz G (February 2004). "An immunodominant epitope of myelin basic protein is an amphipathic alpha-helix". The Journal of Biological Chemistry. 279 (7): 5757–5764. doi: 10.1074/jbc.m311504200 . PMID   14630913.
  18. 1 2 Boggs JM (September 2006). "Myelin basic protein: a multifunctional protein". Cellular and Molecular Life Sciences. 63 (17): 1945–1961. doi:10.1007/s00018-006-6094-7. PMID   16794783. S2CID   1076002.
  19. ↑ Zand R, Li MX, Jin X, Lubman D (February 1998). "Determination of the sites of posttranslational modifications in the charge isomers of bovine myelin basic protein by capillary electrophoresis-mass spectroscopy". Biochemistry. 37 (8): 2441–2449. doi:10.1021/bi972347t. PMID   9485392.
  20. ↑ Berger T, Rubner P, Schautzer F, Egg R, Ulmer H, Mayringer I, et al. (July 2003). "Antimyelin antibodies as a predictor of clinically definite multiple sclerosis after a first demyelinating event". The New England Journal of Medicine. 349 (2): 139–145. doi: 10.1056/NEJMoa022328 . PMID   12853586.
  21. ↑ Pfister HW, Einhäupl KM, Wick M, Fateh-Moghadam A, Huber M, Schielke E, et al. (July 1989). "Myelin basic protein in the cerebrospinal fluid of patients infected with HIV". Journal of Neurology. 236 (5): 288–291. doi:10.1007/bf00314458. PMID   2474637. S2CID   12178626.
  22. ↑ Tejada-Simon MV, Zang YC, Hong J, Rivera VM, Zhang JZ (February 2003). "Cross-reactivity with myelin basic protein and human herpesvirus-6 in multiple sclerosis". Annals of Neurology. 53 (2): 189–197. doi:10.1002/ana.10425. PMID   12557285. S2CID   43317994.
  23. ↑ Namer IJ, Steibel J, Poulet P, Armspach JP, Mohr M, Mauss Y, Chambron J (February 1993). "Blood-brain barrier breakdown in MBP-specific T cell induced experimental allergic encephalomyelitis. A quantitative in vivo MRI study". Brain. 116 ( Pt 1) (1): 147–159. doi:10.1093/brain/116.1.147. PMID   7680933.
  24. ↑ Roy A, Hooper DC (August 2007). "Lethal silver-haired bat rabies virus infection can be prevented by opening the blood-brain barrier". Journal of Virology. 81 (15): 7993–7998. doi:10.1128/JVI.00710-07. PMC   1951307 . PMID   17507463.
  25. ↑ Wood DD, Vella GJ, Moscarello MA (October 1984). "Interaction between human myelin basic protein and lipophilin". Neurochemical Research. 9 (10): 1523–1531. doi:10.1007/BF00964678. PMID   6083474. S2CID   9751765.
  26. ↑ Edwards AM, Ross NW, Ulmer JB, Braun PE (January 1989). "Interaction of myelin basic protein and proteolipid protein". Journal of Neuroscience Research. 22 (1): 97–102. doi:10.1002/jnr.490220113. PMID   2467009. S2CID   33666906.
  27. ↑ Harauz G, Ishiyama N, Hill CM, Bates IR, Libich DS, Farès C (2004). "Myelin basic protein-diverse conformational states of an intrinsically unstructured protein and its roles in myelin assembly and multiple sclerosis". Micron. 35 (7): 503–542. doi:10.1016/j.micron.2004.04.005. PMID   15219899.

Further reading

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