NDLI: Measurement of the rate of protein turnover and synthesis in the marsupial Honey possum (Tarsipes rostratus)

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Measurement of the rate of protein turnover and synthesis in the marsupial Honey possum (Tarsipes rostratus)

Content Provider	Springer Nature Link
Author	Bradshaw, S. D. Bradshaw, F. J.
Copyright Year	2008
Abstract	Rates of protein turnover and synthesis were measured in wild-caught Honey possums (Tarsipes rostratus) in the southwest of Western Australia and compared between males and females with and without pouch young. Possums were injected with 50 μg of 15N-glycine and ammonia collected within 24 h was used as the nitrogen end-product in a single-injection protocol. The overall mean rate of protein synthesis measured was 7.7 ± 0.5 g kg−0.75 day−1, which falls within the range of values reported for other marsupial species. Whole body rates of nitrogen flux and protein synthesis did not vary significantly between males and females with and without young, but females with pouch young showed significantly lower rates of protein synthesis when expressed in relation to metabolic body size. This difference was no longer apparent, however, if the mass of the females was corrected for the estimated mass of the young in the pouch averaging 9.3 ± 1.6 g kg−0.75 day−1 and suggesting that the young should not be considered as part of the metabolic body pool. Whole body rates of protein degradation were significantly reduced in females carrying pouch young, suggesting that protein may be being diverted from the pool to milk production. Calculations indicate that the daily fraction of the female’s nitrogen synthesis rate that needs to be diverted to pouch young to sustain their growth is less than 5%, and may not be detectable with the current methodology.
Starting Page	183
Ending Page	192
Page Count	10
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	179
Issue Number	2
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-09-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Honey possum Marsupial Protein synthesis Nitrogen Reproduction Nectarivore Turnover Animal Physiology Biomedicine general Zoology Human Physiology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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