Haptoglobin

NameHaptoglobin
Synonyms
  • Zonulin
Gene NameHP
OrganismHuman
Amino acid sequence
>lcl|BSEQ0008802|Haptoglobin
MSALGAVIALLLWGQLFAVDSGNDVTDIADDGCPKPPEIAHGYVEHSVRYQCKNYYKLRT
EGDGVYTLNDKKQWINKAVGDKLPECEADDGCPKPPEIAHGYVEHSVRYQCKNYYKLRTE
GDGVYTLNNEKQWINKAVGDKLPECEAVCGKPKNPANPVQRILGGHLDAKGSFPWQAKMV
SHHNLTTGATLINEQWLLTTAKNLFLNHSENATAKDIAPTLTLYVGKKQLVEIEKVVLHP
NYSQVDIGLIKLKQKVSVNERVMPICLPSKDYAEVGRVGYVSGWGRNANFKFTDHLKYVM
LPVADQDQCIRHYEGSTVPEKKTPKSPVGVQPILNEHTFCAGMSKYQEDTCYGDAGSAFA
VHDLEEDTWYATGILSFDKSCAVAEYGVYVKVTSIQDWVQKTIAEN
Number of residues406
Molecular Weight45205.065
Theoretical pINot Available
GO Classification
Functions
  • antioxidant activity
  • serine-type endopeptidase activity
  • hemoglobin binding
Processes
  • response to organic substance
  • proteolysis
  • immune system process
  • negative regulation of oxidoreductase activity
  • defense response
  • negative regulation of hydrogen peroxide catabolic process
  • receptor-mediated endocytosis
  • response to hydrogen peroxide
  • acute-phase response
  • defense response to bacterium
  • positive regulation of cell death
  • acute inflammatory response
Components
  • haptoglobin-hemoglobin complex
  • extracellular region
  • extracellular space
  • extracellular exosome
  • blood microparticle
  • endocytic vesicle lumen
General FunctionSerine-type endopeptidase activity
Specific FunctionAs a result of hemolysis, hemoglobin is found to accumulate in the kidney and is secreted in the urine. Haptoglobin captures, and combines with free plasma hemoglobin to allow hepatic recycling of heme iron and to prevent kidney damage. Haptoglobin also acts as an Antimicrobial; Antioxidant, has antibacterial activity and plays a role in modulating many aspects of the acute phase response. Hemoglobin/haptoglobin complexes are rapidely cleared by the macrophage CD163 scavenger receptor expressed on the surface of liver Kupfer cells through an endocytic lysosomal degradation pathway.Uncleaved haptoglogin, also known as zonulin, plays a role in intestinal permeability, allowing intercellular tight junction disassembly, and controlling the equilibrium between tolerance and immunity to non-self antigens.
Pfam Domain Function
Transmembrane RegionsNot Available
GenBank Protein IDNot Available
UniProtKB IDP00738
UniProtKB Entry NameHPT_HUMAN
Cellular LocationSecreted
Gene sequence
>lcl|BSEQ0019669|Haptoglobin (HP)
ATGAGTGCCCTGGGAGCTGTCATTGCCCTCCTGCTCTGGGGACAGCTTTTTGCAGTGGAC
TCAGGCAATGATGTCACGGATATCGCAGATGACGGCTGCCCGAAGCCCCCCGAGATTGCA
CATGGCTATGTGGAGCACTCGGTTCGCTACCAGTGTAAGAACTACTACAAACTGCGCACA
GAAGGAGATGGAGTGTACACCTTAAACAATGAGAAGCAGTGGATAAATAAGGCTGTTGGA
GATAAACTTCCTGAATGTGAAGCAGTATGTGGGAAGCCCAAGAATCCGGCAAACCCAGTG
CAGCGGATCCTGGGTGGACACCTGGATGCCAAAGGCAGCTTTCCCTGGCAGGCTAAGATG
GTTTCCCACCATAATCTCACCACAGGTGCCACGCTGATCAATGAACAATGGCTGCTGACC
ACGGCTAAAAATCTCTTCCTGAACCATTCAGAAAATGCAACAGCGAAAGACATTGCCCCT
ACTTTAACACTCTATGTGGGGAAAAAGCAGCTTGTAGAGATTGAGAAGGTTGTTCTACAC
CCTAACTACTCCCAGGTAGATATTGGGCTCATCAAACTCAAACAGAAGGTGTCTGTTAAT
GAGAGAGTGATGCCCATCTGCCTACCTTCAAAGGATTATGCAGAAGTAGGGCGTGTGGGT
TATGTTTCTGGCTGGGGGCGAAATGCCAATTTTAAATTTACTGACCATCTGAAGTATGTC
ATGCTGCCTGTGGCTGACCAAGACCAATGCATAAGGCATTATGAAGGCAGCACAGTCCCC
GAAAAGAAGACACCGAAGAGCCCTGTAGGGGTGCAGCCCATACTGAATGAACACACCTTC
TGTGCTGGCATGTCTAAGTACCAAGAAGACACCTGCTATGGCGATGCGGGCAGTGCCTTT
GCCGTTCACGACCTGGAGGAGGACACCTGGTATGCGACTGGGATCTTAAGCTTTGATAAG
AGCTGTGCTGTGGCTGAGTATGGTGTGTATGTGAAGGTGACTTCCATCCAGGACTGGGTT
CAGAAGACCATAGCTGAGAACTAA
GenBank Gene IDNot Available
GeneCard IDNot Available
GenAtlas IDNot Available
HGNC IDHGNC:5141
Chromosome Location16
LocusNot Available
References
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