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Publication Abstract from PubMed

Coelomic cells from the sea cucumber Caudina (Molpadia) arenicola contain four major globins, A, B, C and D. The hemoglobins from this organism show unusual ligand-linked dissociation properties. The complete amino acid sequence of the D globin has been established. It is N-acetylated, consists of 158 residues and has a 10 amino acid N-terminal extension similar to that found in some other invertebrate globins. The C. arenicola D globin has an equal sequence identity (28%) with both alpha and beta human globins and as anticipated, is more closely related to these vertebrate proteins than are molluscan globins. The C. arenicola D globin shows a 59% identity with the globin I from the sea cucumber Paracaudina chilensis. The availability of the C. arenicola D globin sequence will aid the X-ray analysis of this protein and facilitate an understanding of the changes in subunit interactions that occur with cooperative ligand binding.

Amino acid sequence of a globin from the sea cucumber Caudina (Molpadia) arenicola.,Mauri F, Omnaas J, Davidson L, Whitfill C, Kitto GB Biochim Biophys Acta. 1991 May 30;1078(1):63-7. PMID:2049384^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.