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J. Biol. Chem., Vol. 276, Issue 2, 1353-1360, January 12, 2001
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From the Departments of Cellular retinol-binding protein, type I (CRBP-I)
and type II (CRBP-II) are the only members of the fatty acid-binding
protein (FABP) family that process intracellular retinol. Heart and
skeletal muscle take up postprandial retinol but express little or no
CRBP-I or CRBP-II. We have identified an intracellular retinol-binding protein in these tissues. The 134-amino acid protein is encoded by a
cDNA that is expressed primarily in heart, muscle and adipose tissue. It shares 57 and 56% sequence identity with CRBP-I and CRBP-II, respectively, but less than 40% with other members of the
FABP family. In situ hybridization demonstrates that the
protein is expressed at least as early as day 10 in developing heart
and muscle tissue of the embryonic mouse. Fluorescence titrations of
purified recombinant protein with retinol isomers indicates binding to
all-trans-, 13-cis-, and
9-cis-retinol, with respective Kd
values of 109, 83, and 130 nM. Retinoic acids
(all-trans-, 13-cis-, and 9-cis-),
retinals (all-trans-, 13-cis-, and
9-cis-), fatty acids (laurate, myristate, palmitate,
oleate, linoleate, arachidonate, and docosahexanoate), or fatty
alcohols (palmityl, petrosenlinyl, and ricinolenyl) fail to bind. The
distinct tissue expression pattern and binding specificity suggest that
we have identified a novel FABP family member, cellular retinol-binding protein, type III.
Characterization of a New Member of the Fatty Acid-binding
Protein Family That Binds All-trans-retinol*
,
,
,
, and
**
Medicine,
§ Urology, and
Microbiology and ** Institute of Human
Nutrition, College of Physicians & Surgeons of Columbia University,
New York, New York, 10032 and ¶ Department of Biological
Sciences, New England College of Optometry,
Boston, Massachusetts 02115
*
This work was supported by National Institutes of Health
Grant R01 DK52444.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.

To whom correspondence should be addressed: Dept. of Medicine,
Columbia University, 701 W 168th St., New York, NY 10032. Tel.: 212-305-5429; Fax: 212-305-5384; E-mail: WSB2@columbia.edu.
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