1t1n

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Image:1t1n.gif

1t1n, resolution 2.2Å

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CRYSTAL STRUCTURE OF CARBONMONOXY HEMOGLOBIN

Overview

As new structural data have become available, somewhat contrasting, explanations of the Root effect in fish haemoglobins (Hb) have been, provided. Hb 1 of the Antarctic fish Trematomus newnesi has a nearly, pH-independent oxygen affinity, in spite of 95 % sequence identity with Hb, 1 of Trematomus (previously named Pagothenia) bernacchii that has a strong, Root effect. Here, the 2.2 A R-state structure of Trematomus newnesi Hb 1, is presented. The structure is similar to that of Root effect fish Hbs, from Spot and T. bernacchii, suggesting that the differences in the pH, dependence cannot be related to the modulation of the R-state. In, comparison to T. bernacchii Hb 1, the role of the three mutations Thr41, (C6)alpha-->Ile, Ala97 (G3)alpha-->Ser and His41 (C7)beta-->Tyr at the, alpha1beta2-interface is discussed.

About this Structure

1T1N is a Protein complex structure of sequences from Trematomus newnesi with ACE, HEM and CMO as ligands. Full crystallographic information is available from OCA.

Reference

Crystal structure of Trematomus newnesi haemoglobin re-opens the root effect question., Mazzarella L, D'Avino R, di Prisco G, Savino C, Vitagliano L, Moody PC, Zagari A, J Mol Biol. 1999 Apr 16;287(5):897-906. PMID:10222199

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