UniProt functional annotation for P02753



	UniProt functional annotation for P02753

UniProt code: P02753.

Organism: Homo sapiens (Human).

Taxonomy: Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo.

Function: Retinol-binding protein that mediates retinol transport in blood plasma (PubMed:5541771). Delivers retinol from the liver stores to the peripheral tissues (Probable). Transfers the bound all-trans retinol to STRA6, that then facilitates retinol transport across the cell membrane (PubMed:22665496). {ECO:0000269|PubMed:22665496, ECO:0000305, ECO:0000305|PubMed:5541771}.

Subunit: Interacts with TTR (PubMed:5541771, PubMed:7754382, PubMed:10052934, PubMed:19021760). Interaction with TTR prevents its loss by filtration through the kidney glomeruli (Probable). Interacts with STRA6 (PubMed:22665496, PubMed:25910211). {ECO:0000269|PubMed:10052934, ECO:0000269|PubMed:19021760, ECO:0000269|PubMed:22665496, ECO:0000269|PubMed:25910211, ECO:0000269|PubMed:5541771, ECO:0000269|PubMed:7754382, ECO:0000305}.

Subcellular location: Secreted {ECO:0000269|PubMed:12237133, ECO:0000269|PubMed:2444024, ECO:0000269|PubMed:5541771}.

Tissue specificity: Detected in blood plasma and in urine (at protein level). {ECO:0000269|PubMed:2444024, ECO:0000269|PubMed:5541771}.

Mass spectrometry: [Plasma retinol-binding protein(1-181)]: Mass=21063.46; Mass_error=1.88; Method=Electrospray; Evidence={ECO:0000269|PubMed:7666002};

Mass spectrometry: [Plasma retinol-binding protein(1-179)]: Mass=20534; Method=MALDI; Evidence={ECO:0000269|PubMed:12237133};

Mass spectrometry: [Plasma retinol-binding protein(1-181)]: Mass=20162; Method=MALDI; Evidence={ECO:0000269|PubMed:12237133};

Disease: Retinal dystrophy, iris coloboma, and comedogenic acne syndrome (RDCCAS) [MIM:615147]: A disease characterized by retinal degeneration, ocular colobomas involving both the anterior and posterior segment, impaired night vision and loss of visual acuity. Additional characteristic features include developmental abnormalities and severe acne. {ECO:0000269|PubMed:10232633, ECO:0000269|PubMed:23189188, ECO:0000269|PubMed:9888420}. Note=The disease is caused by variants affecting the gene represented in this entry. Loss of functional RBP4 protein results in serum retinol deficiency. Lack of normal levels of retinol impairs the visual cycle leading to night blindness at early stages; prolonged deficiency may lead to retinal degeneration. Additionally, retinol deficiency may result in dry skin, increased susceptibility to infection and acne (PubMed:23189188). {ECO:0000269|PubMed:23189188}.

Disease: Microphthalmia, isolated, with coloboma, 10 (MCOPCB10) [MIM:616428]: A disorder of eye formation, ranging from small size of a single eye to complete bilateral absence of ocular tissues. Ocular abnormalities like opacities of the cornea and lens, scaring of the retina and choroid, and other abnormalities may also be present. Ocular colobomas are a set of malformations resulting from abnormal morphogenesis of the optic cup and stalk, and the fusion of the fetal fissure (optic fissure). {ECO:0000269|PubMed:25910211}. Note=The disease is caused by variants affecting the gene represented in this entry.

Similarity: Belongs to the calycin superfamily. Lipocalin family. {ECO:0000305}.

Sequence caution: Sequence=AAF69622.1; Type=Erroneous initiation; Note=Truncated N-terminus.; Evidence={ECO:0000305};

Annotations taken from UniProtKB at the EBI.


Organism:		Homo sapiens (Human).
Taxonomy:		Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo.



Function:		Retinol-binding protein that mediates retinol transport in blood plasma (PubMed:5541771). Delivers retinol from the liver stores to the peripheral tissues (Probable). Transfers the bound all-trans retinol to STRA6, that then facilitates retinol transport across the cell membrane (PubMed:22665496). {ECO:0000269\|PubMed:22665496, ECO:0000305, ECO:0000305\|PubMed:5541771}.


Subunit:		Interacts with TTR (PubMed:5541771, PubMed:7754382, PubMed:10052934, PubMed:19021760). Interaction with TTR prevents its loss by filtration through the kidney glomeruli (Probable). Interacts with STRA6 (PubMed:22665496, PubMed:25910211). {ECO:0000269\|PubMed:10052934, ECO:0000269\|PubMed:19021760, ECO:0000269\|PubMed:22665496, ECO:0000269\|PubMed:25910211, ECO:0000269\|PubMed:5541771, ECO:0000269\|PubMed:7754382, ECO:0000305}.
Subcellular location:		Secreted {ECO:0000269\|PubMed:12237133, ECO:0000269\|PubMed:2444024, ECO:0000269\|PubMed:5541771}.
Tissue specificity:		Detected in blood plasma and in urine (at protein level). {ECO:0000269\|PubMed:2444024, ECO:0000269\|PubMed:5541771}.
Mass spectrometry:		[Plasma retinol-binding protein(1-181)]: Mass=21063.46; Mass_error=1.88; Method=Electrospray; Evidence={ECO:0000269\|PubMed:7666002};
Mass spectrometry:		[Plasma retinol-binding protein(1-179)]: Mass=20534; Method=MALDI; Evidence={ECO:0000269\|PubMed:12237133};
Mass spectrometry:		[Plasma retinol-binding protein(1-181)]: Mass=20162; Method=MALDI; Evidence={ECO:0000269\|PubMed:12237133};
Disease:		Retinal dystrophy, iris coloboma, and comedogenic acne syndrome (RDCCAS) [MIM:615147]: A disease characterized by retinal degeneration, ocular colobomas involving both the anterior and posterior segment, impaired night vision and loss of visual acuity. Additional characteristic features include developmental abnormalities and severe acne. {ECO:0000269\|PubMed:10232633, ECO:0000269\|PubMed:23189188, ECO:0000269\|PubMed:9888420}. Note=The disease is caused by variants affecting the gene represented in this entry. Loss of functional RBP4 protein results in serum retinol deficiency. Lack of normal levels of retinol impairs the visual cycle leading to night blindness at early stages; prolonged deficiency may lead to retinal degeneration. Additionally, retinol deficiency may result in dry skin, increased susceptibility to infection and acne (PubMed:23189188). {ECO:0000269\|PubMed:23189188}.
Disease:		Microphthalmia, isolated, with coloboma, 10 (MCOPCB10) [MIM:616428]: A disorder of eye formation, ranging from small size of a single eye to complete bilateral absence of ocular tissues. Ocular abnormalities like opacities of the cornea and lens, scaring of the retina and choroid, and other abnormalities may also be present. Ocular colobomas are a set of malformations resulting from abnormal morphogenesis of the optic cup and stalk, and the fusion of the fetal fissure (optic fissure). {ECO:0000269\|PubMed:25910211}. Note=The disease is caused by variants affecting the gene represented in this entry.
Similarity:		Belongs to the calycin superfamily. Lipocalin family. {ECO:0000305}.
Sequence caution:		Sequence=AAF69622.1; Type=Erroneous initiation; Note=Truncated N-terminus.; Evidence={ECO:0000305};