Amino acid residues in conodont elements

Kemp, A. R. (2002) Amino acid residues in conodont elements. Journal of Paleontology, 76 3: 518-528.


Author Kemp, A. R.
Title Amino acid residues in conodont elements
Journal name Journal of Paleontology   Check publisher's open access policy
ISSN 0022-3360
Publication date 2002-05
Sub-type Article (original research)
DOI 10.1666/0022-3360(2002)076<0518:AARICE>2.0.CO;2
Volume 76
Issue 3
Start page 518
End page 528
Total pages 11
Place of publication Lawrence
Publisher Paleontological Society Inc
Collection year 2002
Language eng
Subject C1
260112 Palaeontology
780105 Biological sciences
780104 Earth sciences
Abstract Thermally unaltered conodont elements, brachiopods. and vertebrates were analyzed with reverse phase high profile liquid chromatography to locate and quantify amino acid remnants of the original organic matrix in the fossils. No consistent similarities in amino acid content were found in conodont taxa. and criteria based on organic residues appear to have no taxonomic significance in the fossils tested from these localities. However, hydroxyproline. an amino acid that is found in the collagen molecules of animals. as well as in the glycoproteins in the cell walls and reproductive tissues of certain plants, is represented in most taxa. The organic matter retained in the impermeable crowns of conodont elements might have been derived originally from a form of collagen. Biochemical analyses. correlated with histochemical tests, demonstrate that organic matter is an integral part of the hyaline tissue of the element crown and not the result of surface contamination. Tests of a range of vertebrate and invertebrate fossil hard tissues produced similar results. The analyses indicate that hyaline tissue in the conodont element crown is not a form of vertebrate enamel. which contains no collagen. Albid tissue. with little or no organic content. is not a form of vertebrate bone or dentine, both based on collagen and low in mineral. Although these results do not help to determine the phylogenetic affinities of conodont animals, they indicate teat conodont elements do not contain hard tissues characteristic of vertebrate animals.
Keyword Paleontology
Proteins
Fossils
Tissues
Matrix
Dentin
Enamel
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Centre for Marine Studies Publications
 
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