Abstract
Rates of protein synthesis in the whole body and tissues ofOctopus vulgaris collected in September 1985 and 1986 from the Bay of Naples were measured following a flooding dose injection of3H phenylalanine. There were stable phenylalanine free pool-specific radioactivities and linear incorporation of radiolabel into arm-tip protein from 10 to 30 min after the injection. In starved individuals there were no significant differences between the fractional rates of protein synthesis of the following tissues: ventricle, brain, branchial heart, arm tip, gill, stomach, arm, renal appendage and mantle. The mean value (± SE) for all the tissues was 3.02 ± 0.17% d−1. In individuals fed varying amounts of crab, resulting in differing growth rates, there was a linear increase in fractional rates of whole-body protein synthesis with growth rate. A standard 148 g octopus growing at 3.0% d−1 synthesised 0.54 g of protein, with 0.43 g of this protein retained as growth. The proportion of the total protein synthesis which was retained as growth increased with increasing growth rate; at a maximum growth rate of 6% d−1, over 90% of the protein synthesised was retained as growth. The ventricle, arm tip, gill, arm and mantle also showed similar patterns of a linear increase in fractional rates of protein synthesis with increased growth rates. The RNA concentrations in the whole body and tissues increased with increasing growth rates, but the major change was an increase in the efficiency of translation. It is concluded that rapid growth rates inO. vulgaris are brought about by high rates of protein synthesis and high efficiencies of retention of synthesised protein and, therefore, little protein degradation.
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Communicated by J. Mauchline, Oban
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Houlihan, D.F., McMillan, D.N., Agnisola, C. et al. Protein synthesis and growth inOctopus vulgaris . Mar. Biol. 106, 251–259 (1990). https://doi.org/10.1007/BF01314808
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DOI: https://doi.org/10.1007/BF01314808