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2vee

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{{STRUCTURE_2vee| PDB=2vee | SCENE= }}
{{STRUCTURE_2vee| PDB=2vee | SCENE= }}
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'''STRUCTURE OF PROTOGLOBIN FROM METHANOSARCINA ACETIVORANS C2A'''
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===STRUCTURE OF PROTOGLOBIN FROM METHANOSARCINA ACETIVORANS C2A===
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==Overview==
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The structural adaptability of the globin fold has been highlighted by the recent discovery of the 2-on-2 haemoglobins, of neuroglobin and cytoglobin. Protoglobin from Methanosarcina acetivorans C2A-a strictly anaerobic methanogenic Archaea-is, to the best of our knowledge, the latest entry adding new variability and functional complexity to the haemoglobin (Hb) superfamily. Here, we report the 1.3 A crystal structure of oxygenated M. acetivorans protoglobin, together with the first insight into its ligand-binding properties. We show that, contrary to all known globins, protoglobin-specific loops and an amino-terminal extension completely bury the haem within the protein matrix. Access of O(2), CO and NO to the haem is granted by the protoglobin-specific apolar tunnels reaching the haem distal site from locations at the B/G and B/E helix interfaces. Functionally, M. acetivorans dimeric protoglobin shows a selectivity ratio for O(2)/CO binding to the haem that favours O(2) ligation and anticooperativity in ligand binding. Both properties are exceptional within the Hb superfamily.
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{{ABSTRACT_PUBMED_18188182}}
==About this Structure==
==About this Structure==
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[[Category: Protoglobin]]
[[Category: Protoglobin]]
[[Category: Transport protein]]
[[Category: Transport protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 16:28:00 2008''

Revision as of 13:28, 27 July 2008

Image:2vee.png

Template:STRUCTURE 2vee

STRUCTURE OF PROTOGLOBIN FROM METHANOSARCINA ACETIVORANS C2A

Template:ABSTRACT PUBMED 18188182

About this Structure

2VEE is a Single protein structure of sequence from Methanosarcina acetivorans. Full crystallographic information is available from OCA.

Reference

Archaeal protoglobin structure indicates new ligand diffusion paths and modulation of haem-reactivity., Nardini M, Pesce A, Thijs L, Saito JA, Dewilde S, Alam M, Ascenzi P, Coletta M, Ciaccio C, Moens L, Bolognesi M, EMBO Rep. 2008 Feb;9(2):157-63. Epub 2008 Jan 11. PMID:18188182

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