| Structural highlights
Function
[CAMP1_HUMAN] Probable microtubule-binding protein that plays a role in the regulation of cell morphology and cytoskeletal organization. Through interaction with spectrin may regulate neurite outgrowth.[1] [2] [3] [TBB5_HUMAN] Tubulin is the major constituent of microtubules. It binds two moles of GTP, one at an exchangeable site on the beta chain and one at a non-exchangeable site on the alpha chain. [TBA1B_HUMAN] Tubulin is the major constituent of microtubules. It binds two moles of GTP, one at an exchangeable site on the beta chain and one at a non-exchangeable site on the alpha chain.
Publication Abstract from PubMed
Heterobimetallic Mn/Fe proteins represent a new cofactor paradigm in bioinorganic chemistry and pose countless outstanding questions. The assembly of the active site defies common chemical convention by contradicting the Irving-Williams series, while the scope of reactivity remains unexplored. In this work, the assembly and C-H bond activation process in the Mn/Fe R2-like ligand-binding oxidase (R2lox) protein is investigated using a suite of biophysical techniques, including time-resolved optical spectroscopy, global kinetic modeling, X-ray crystallography, electron paramagnetic resonance spectroscopy, protein electrochemistry, and mass spectrometry. Selective metal binding is found to be under thermodynamic control, with the binding sites within the apo-protein exhibiting greater Mn(II) affinity than Fe(II) affinity. The comprehensive analysis of structure and reactivity of wild-type R2lox and targeted primary and secondary sphere mutants indicate that the efficiency of C-H bond activation directly correlates with the Mn/Fe cofactor reduction potentials and is inversely related to divalent metal binding affinity. These findings suggest the R2lox active site is precisely tuned for achieving both selective heterobimetallic binding and high levels of reactivity and offer a mechanism to examine the means by which proteins achieve appropriate metal incorporation.
Key Structural Motifs Balance Metal Binding and Oxidative Reactivity in a Heterobimetallic Mn/Fe Protein.,Kisgeropoulos EC, Griese JJ, Smith ZR, Branca RMM, Schneider CR, Hogbom M, Shafaat HS J Am Chem Soc. 2020 Mar 18;142(11):5338-5354. doi: 10.1021/jacs.0c00333. Epub, 2020 Mar 9. PMID:32062969[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Baines AJ, Bignone PA, King MD, Maggs AM, Bennett PM, Pinder JC, Phillips GW. The CKK domain (DUF1781) binds microtubules and defines the CAMSAP/ssp4 family of animal proteins. Mol Biol Evol. 2009 Sep;26(9):2005-14. doi: 10.1093/molbev/msp115. Epub 2009 Jun , 9. PMID:19508979 doi:http://dx.doi.org/10.1093/molbev/msp115
- ↑ Bai SW, Herrera-Abreu MT, Rohn JL, Racine V, Tajadura V, Suryavanshi N, Bechtel S, Wiemann S, Baum B, Ridley AJ. Identification and characterization of a set of conserved and new regulators of cytoskeletal organization, cell morphology and migration. BMC Biol. 2011 Aug 11;9:54. doi: 10.1186/1741-7007-9-54. PMID:21834987 doi:10.1186/1741-7007-9-54
- ↑ King MD, Phillips GW, Bignone PA, Hayes NV, Pinder JC, Baines AJ. A conserved sequence in calmodulin regulated spectrin-associated protein 1 links its interaction with spectrin and calmodulin to neurite outgrowth. J Neurochem. 2014 Feb;128(3):391-402. doi: 10.1111/jnc.12462. Epub 2013 Oct 24. PMID:24117850 doi:http://dx.doi.org/10.1111/jnc.12462
- ↑ Kisgeropoulos EC, Griese JJ, Smith ZR, Branca RMM, Schneider CR, Hogbom M, Shafaat HS. Key Structural Motifs Balance Metal Binding and Oxidative Reactivity in a Heterobimetallic Mn/Fe Protein. J Am Chem Soc. 2020 Mar 18;142(11):5338-5354. doi: 10.1021/jacs.0c00333. Epub, 2020 Mar 9. PMID:32062969 doi:http://dx.doi.org/10.1021/jacs.0c00333
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