The X-ray structures of two hemoglobins (Hb) from the sea cucumber Caudina arenicola (an echinoderm) have been determined: a low spin, hemichrome, monomeric Hb-C chain, and a cyanomet-liganded dimeric Hb-D chain. Attempts to obtain crystal structures of the deoxy-liganded and hemichrome forms from the same chain type have not been successful ...
The X-ray structures of two hemoglobins (Hb) from the sea cucumber Caudina arenicola (an echinoderm) have been determined: a low spin, hemichrome, monomeric Hb-C chain, and a cyanomet-liganded dimeric Hb-D chain. Attempts to obtain crystal structures of the deoxy-liganded and hemichrome forms from the same chain type have not been successful. In this work, the Hb-C chain and Hb-D chain structures are compared, and differences observed in tertiary structure related to the different ligand states for hemoglobin chains from this organism. In addition to shifts of the distal histidine and E helix, differences are noted in the position of the heme group within the heme pocket, the hydrogen bonding of the heme group to the protein, and the status of the D helix. These differences are important in understanding the ligand-linked association states of these hemoglobins. The quaternary structure of the Hb-D homodimer is compared with those from two other invertebrate hemoglobins from Scapharca inaequivalvis and Urechis caupo, which also have subunit-subunit interactions that involve the E and E' helices. The dimer interactions of the Caudina and Urechis hemoglobins are quite dissimilar. However, the dimer interface observed in cyanomet Hb-D is strikingly similar to that observed for the carbonmonoxy hemoglobin dimer from the clam, Scapharca, yet many of the key amino acid residues implicated in the cooperative mechanism of the Scapharca hemoglobin are not conserved in the Caudina hemoglobins.
Related Citations:
Amino Acid Sequence of the Coelomic C Globin from the Sea Cucumber Caudina (Molpadia) Arenicola Mcdonald, G.D., Davidson, L., Kitto, G.B. (1992) J Protein Chem 11: 29
Preliminary Crystallographic Data on Monomeric and Dimeric Hemoglobins from the Sea Cucumber, Molpadia Arenicola Carson, W.M., Bowers, T.R., Kitto, G.B., Hackert, M.L. (1979) J Biol Chem 254: 7400
Functional Consequences of Ligand-Linked Dissociation in Hemoglobin from the Sea Cucumber Molpadia Arenicola Bonaventura, C., Bonaventura, J., Kitto, B., Brunori, M., Antonini, E. (1976) Biochim Biophys Acta 428: 779
N-Terminal Substitution of Some Sea Cucumber Hemoglobins Kitto, G.B., Erwin, D., West, R., Omnaas, J. (1976) Comp Biochem Physiol B 55: 105
Organizational Affiliation:
Department of Chemistry and Biochemistry, University of Texas at Austin 78712, USA.
Download Mendeley
