scholarly journals Localization of sites for ionic interaction with lipid in the C-terminal third of the bovine myelin basic protein

1977 ◽  
Vol 167 (3) ◽  
pp. 583-591 ◽  
Author(s):  
A J S Jones ◽  
M G Rumsby
Keyword(s):  
Myelin Basic Protein ◽  
Basic Protein ◽  
Protein Molecule ◽  
Molar Ratio ◽  
Tryptophan Residue ◽  
Peptide Fragment ◽  
Neutral Complex ◽  
Chloroform Phase ◽  
Complex Lipids ◽  
Soluble Complexes

The myelin basic protein from bovine brain tissue was purified and the two peptides obtained by cleavage of the polypeptide chain at the single tryptophan residue were isolated. The interaction of these peptides and the intact basic protein with complex lipids was investigated by following the solubilization of lipid-protein complexes into chloroform in a biphasic solvent system. The C-terminal peptide fragment (residues 117-170) and the intact basic protein both formed chloroform-soluble complexes with acidic lipids, but not with neutral complex lipids. The N-terminal fragment (residues 1-115) did not form chloroform-soluble complexes with either acidic or neutral complex lipids. The molar ratio of lipid to protein that caused a 50% loss of protein from the upper phase to the lower chloroform phase was the same for the intact basic protein as for the smaller C-terminal peptide fragment. Phosphatidylserine and phosphatidylinositol were approximately twice as efficient as sulphatide at causing protein redistribution to the chloroform phase. The results are interpreted as indicating that the sites for ionic interactions between lipid and charged groups on the basic protein of myelin are located in the C-terminal region of the protein molecule.

Myelin basic protein binds heme at a specific site near the tryptophan residue

Biochemistry ◽  
1987 ◽  
Vol 26 (8) ◽  
pp. 2175-2182 ◽  
Author(s):  
Stephen J. Morris ◽  
Diane Bradley ◽  
Anthony T. Campagnoni ◽  
Gerald L. Stoner
Keyword(s):  
Myelin Basic Protein ◽  
Basic Protein ◽  
Specific Site ◽  
Tryptophan Residue

N.M.R. studies on myelin basic protein. II. 1H N.M.R. studies of the protein and constituent peptides in aqueous solutions

1978 ◽  
Vol 31 (11) ◽  
pp. 2387 ◽  
Author(s):  
LAT Littlemore
Keyword(s):  
Chemical Shift ◽  
Myelin Basic Protein ◽  
Cathepsin D ◽  
Ring Current ◽  
Basic Protein ◽  
Tertiary Structure ◽  
Pulse Sequence ◽  
Chemical Shift Assignments ◽  
Peptide Fragment ◽  
Line Widths

1H N.M.R. spectra (270 MHz) of myelin basic protein (MBP) at pD 3.7 in D2O were obtained as a function of concentration and compared with computed spectra. Reduced line widths obtained for 0.5-mM samples and use of the convolution difference technique enabled detection of chemical shift heterogeneities for histidine, tyrosine, methionine, threonine, and isoleucine residues in the protein; this is indicative of secondary/tertiary structure. Chemical shift assignments were confirmed by the use of the Carr-Purcell A pulse sequence and selective decoupling as well as by correlation of the MBP spectrum with that of its constituent cathepsin D digest peptides. The methyl resonance from the unique methylated arginine-107 was found, and its chemical shift compared to that of NG-monomethyl-L-arginine and the methylated arginine peak in the peptide fragment, residues 90-170. The absence of ring- current effects on the methyl chemical shift precludes conformations of MBP in which the methylarginine interacts with the phenylalanine pair at residues 89 and 90.

scholarly journals Interaction of the myelin basic protein with the anionic detergent sodium dodecyl sulphate

1978 ◽  
Vol 169 (2) ◽  
pp. 281-285 ◽  
Author(s):  
A J S Jones ◽  
M G Rumsby
Keyword(s):  
Myelin Basic Protein ◽  
Sodium Dodecyl Sulphate ◽  
Basic Protein ◽  
Hydrophobic Interactions ◽  
Rapid Development ◽  
Sodium Dodecyl ◽  
Molecular Size ◽  
Transient Increase ◽  
Tryptophan Residue ◽  
Molar Ratios

The interaction of the myelin basic protein and two peptides derived from it with the anionic detergent SDS (sodium dodecyl sulphate) was studied. At molar ratios of detergent/protein of up to approx. 20:1 the transient increase in turbidity (as measured by increases in A230) is proportional to the ratio. Between ratios of 30:1 and 100:1 the effect of the detergent is constant and maximal. At molar ratios exceeding 100:1 the transient increase in turbidity decreases with increasing amounts of detergent. With increasing ionic strength the rapid development of turbidity is inhibited, whereas the slow decay of turbidity is not affected. Neither of the peptide fragments produced by cleavage of the myelin basic protein at the single tryptophan residue, nor both when mixed, produce measurable turbidity when mixed with SDS. Under similar conditions poly-L-lysine of similar molecular size to the basic protein shows the increase in turbidity but not the decay. The interaction between the protein and SDS is interpreted in molecular terms, which involve the initial ionic interaction of the detergent with protein resulting in aggregation and turbidity in the solution. Within the aggregated complexes molecules rearrange to maximize hydrophobic interactions.

scholarly journals Myelin basic protein enhances axonal regeneration from neural progenitor cells

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhengjian Yan ◽  
Lei Chu ◽  
Xiaojiong Jia ◽  
Lu Lin ◽  
Si Cheng
Keyword(s):  
Myelin Basic Protein ◽  
Neurite Outgrowth ◽  
Progenitor Cells ◽  
Axonal Regeneration ◽  
Neural Progenitor Cells ◽  
Basic Protein ◽  
Neural Progenitor ◽  
Dependent Manner ◽  
Cord Injury

Abstract Introduction Stem cell therapy using neural progenitor cells (NPCs) shows promise in mitigating the debilitating effects of spinal cord injury (SCI). Notably, myelin stimulates axonal regeneration from mammalian NPCs. This led us to hypothesize that myelin-associated proteins may contribute to axonal regeneration from NPCs. Methods We conducted an R-based bioinformatics analysis to identify key gene(s) that may participate in myelin-associated axonal regeneration from murine NPCs, which identified the serine protease myelin basic protein (Mbp). We employed E12 murine NPCs, E14 rat NPCs, and human iPSC-derived Day 1 NPCs (D1 hNPCs) with or without CRISPR/Cas9-mediated Mbp knockout in combination with rescue L1-70 overexpression, constitutively-active VP16-PPARγ2, or the PPARγ agonist ciglitazone. A murine dorsal column crush model of SCI utilizing porous collagen-based scaffolding (PCS)-seeded murine NPCs with or without stable Mbp overexpression was used to assess locomotive recovery and axonal regeneration in vivo. Results Myelin promotes axonal outgrowth from NPCs in an Mbp-dependent manner and that Mbp’s stimulatory effects on NPC neurite outgrowth are mediated by Mbp’s production of L1-70. Furthermore, we determined that Mbp/L1-70’s stimulatory effects on NPC neurite outgrowth are mediated by PPARγ-based repression of neuron differentiation-associated gene expression and PPARγ-based Erk1/2 activation. In vivo, PCS-seeded murine NPCs stably overexpressing Mbp significantly enhanced locomotive recovery and axonal regeneration in post-SCI mice. Conclusions We discovered that Mbp supports axonal regeneration from mammalian NPCs through the novel Mbp/L1cam/Pparγ signaling pathway. This study suggests that bioengineered, NPC-based interventions can promote axonal regeneration and functional recovery post-SCI.

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