Reviewed, UniProtKB/Swiss-Prot P20916 (MAG_HUMAN)

Names and originHide

Protein names

Recommended name:
Myelin-associated glycoprotein

Alternative name(s):
Siglec-4a

Gene names

Name:	MAG
Synonyms:	GMA

Organism

Homo sapiens (Human) [Complete proteome]

Taxonomic identifier

9606 [NCBI]

Taxonomic lineage

Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo

Protein attributesHide

Sequence length	626 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is further processed into a mature form.
Protein existence	Evidence at protein level.

General annotation (Comments)Hide

Function	Adhesion molecule in postnatal neural development that mediates sialic-acid dependent cell-cell interactions between neuronal and myelinating cells. Preferentially binds to alpha-2,3-linked sialic acid By similarity.
Subunit structure	Binds to RTN4R By similarity.
Subcellular location	Membrane; Single-pass type I membrane protein.
Sequence similarities	Belongs to the immunoglobulin superfamily. SIGLEC (sialic acid binding Ig-like lectin) family. Contains 4 Ig-like C2-type (immunoglobulin-like) domains. Contains 1 Ig-like V-type (immunoglobulin-like) domain.

OntologiesHide

Keywords
Biological process	Cell adhesion
Cellular component	Membrane
Coding sequence diversity	Polymorphism
Domain	Immunoglobulin domain Repeat Signal Transmembrane
Ligand	Lectin
PTM	Disulfide bond Glycoprotein Lipoprotein Palmitate
Technical term	Complete proteome
Gene Ontology (GO)
Biological process	cell adhesion Inferred from electronic annotation. Source: UniProtKB-KW negative regulation of axonogenesis Inferred from Experiment. Source: Reactome
Cellular component	integral to membrane Inferred from electronic annotation. Source: UniProtKB-KW plasma membrane Inferred from Experiment. Source: Reactome
Molecular function	sugar binding Inferred from electronic annotation. Source: UniProtKB-KW
Complete GO annotation...

Sequence annotation (Features)Hide

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Signal peptide	1 – 19	19
	Chain	20 – 626	607	Myelin-associated glycoprotein		PRO_0000014856
Regions
	Topological domain	20 – 516	497	Extracellular Potential
	Transmembrane	517 – 536	20	Helical; Potential
	Topological domain	537 – 626	90	Cytoplasmic Potential
	Domain	22 – 120	99	Ig-like V-type
	Domain	139 – 237	99	Ig-like C2-type 1
	Domain	241 – 325	85	Ig-like C2-type 2
	Domain	327 – 412	86	Ig-like C2-type 3
	Domain	413 – 508	96	Ig-like C2-type 4
Sites
	Binding site	118	1	Sialic acid By similarity
	Site	332	1	Not glycosylated
Amino acid modifications
	Lipidation	531	1	S-palmitoyl cysteine By similarity
	Glycosylation	99	1	N-linked (GlcNAc...) Ref.5
	Glycosylation	106	1	N-linked (GlcNAc...); partial Ref.5
	Glycosylation	223	1	N-linked (GlcNAc...) Ref.5
	Glycosylation	246	1	N-linked (GlcNAc...) Ref.5
	Glycosylation	315	1	N-linked (GlcNAc...) Ref.5
	Glycosylation	406	1	N-linked (GlcNAc...) Ref.5
	Glycosylation	450	1	N-linked (GlcNAc...) Ref.5
	Glycosylation	454	1	N-linked (GlcNAc...) Ref.5
	Disulfide bond	37 ↔ 165		By similarity
	Disulfide bond	42 ↔ 100		By similarity
	Disulfide bond	159 ↔ 217		By similarity
	Disulfide bond	261 ↔ 305		By similarity
	Disulfide bond	347 ↔ 392		By similarity
	Disulfide bond	421 ↔ 430		By similarity
	Disulfide bond	432 ↔ 488		By similarity
Natural variations
	Natural variant	202	1	L → M. [dbSNP:rs11084810]		VAR_059399
Experimental info
	Sequence conflict	614	1	T → S Ref.2

SequencesHide

	Sequence		Length	Mass (Da)
	P20916-1 [UniParc]. Last modified February 1, 1991. Version 1. Checksum: ED2D36B24F21CAAA	FASTA	626	69,069
	10 20 30 40 50 60 MIFLTALPLF WIMISASRGG HWGAWMPSSI SAFEGTCVSI PCRFDFPDEL RPAVVHGVWY 70 80 90 100 110 120 FNSPYPKNYP PVVFKSRTQV VHESFQGRSR LLGDLGLRNC TLLLSNVSPE LGGKYYFRGD 130 140 150 160 170 180 LGGYNQYTFS EHSVLDIVNT PNIVVPPEVV AGTEVEVSCM VPDNCPELRP ELSWLGHEGL 190 200 210 220 230 240 GEPAVLGRLR EDEGTWVQVS LLHFVPTREA NGHRLGCQAS FPNTTLQFEG YASMDVKYPP 250 260 270 280 290 300 VIVEMNSSVE AIEGSHVSLL CGADSNPPPL LTWMRDGTVL REAVAESLLL ELEEVTPAED 310 320 330 340 350 360 GVYACLAENA YGQDNRTVGL SVMYAPWKPT VNGTMVAVEG ETVSILCSTQ SNPDPILTIF 370 380 390 400 410 420 KEKQILSTVI YESELQLELP AVSPEDDGEY WCVAENQYGQ RATAFNLSVE FAPVLLLESH 430 440 450 460 470 480 CAAARDTVQC LCVVKSNPEP SVAFELPSRN VTVNESEREF VYSERSGLVL TSILTLRGQA 490 500 510 520 530 540 QAPPRVICTA RNLYGAKSLE LPFQGAHRLM WAKIGPVGAV VAFAILIAIV CYITQTRRKK 550 560 570 580 590 600 NVTESPSFSA GDNPPVLFSS DFRISGAPEK YESERRLGSE RRLLGLRGEP PELDLSYSHS 610 620 DLGKRPTKDS YTLTEELAEY AEIRVK

ReferencesHide

	« Hide 'large scale' referencesShow 'large scale' references »
[1]	"cDNA cloning and amino acid sequence for human myelin-associated glycoprotein." Sato S., Fujita N., Kurihara T., Kuwano R., Sakimura K., Takahashi Y., Miyatake T. Biochem. Biophys. Res. Commun. 163:1473-1480(1989) [PubMed: 2476987] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA].
[2]	"Molecular cloning of human myelin-associated glycoprotein." Spagnol G., Williams M., Srinivasan J., Golier J., Bauer D., Lebo R.V., Latov N. J. Neurosci. Res. 24:137-142(1989) [PubMed: 2479762] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA]. Tissue: Brain.
[3]	"The DNA sequence and biology of human chromosome 19." Grimwood J., Gordon L.A., Olsen A.S., Terry A., Schmutz J., Lamerdin J.E., Hellsten U., Goodstein D., Couronne O., Tran-Gyamfi M., Aerts A., Altherr M., Ashworth L., Bajorek E., Black S., Branscomb E., Caenepeel S., Carrano A.V. , Caoile C., Chan Y.M., Christensen M., Cleland C.A., Copeland A., Dalin E., Dehal P., Denys M., Detter J.C., Escobar J., Flowers D., Fotopulos D., Garcia C., Georgescu A.M., Glavina T., Gomez M., Gonzales E., Groza M., Hammon N., Hawkins T., Haydu L., Ho I., Huang W., Israni S., Jett J., Kadner K., Kimball H., Kobayashi A., Larionov V., Leem S.-H., Lopez F., Lou Y., Lowry S., Malfatti S., Martinez D., McCready P.M., Medina C., Morgan J., Nelson K., Nolan M., Ovcharenko I., Pitluck S., Pollard M., Popkie A.P., Predki P., Quan G., Ramirez L., Rash S., Retterer J., Rodriguez A., Rogers S., Salamov A., Salazar A., She X., Smith D., Slezak T., Solovyev V., Thayer N., Tice H., Tsai M., Ustaszewska A., Vo N., Wagner M., Wheeler J., Wu K., Xie G., Yang J., Dubchak I., Furey T.S., DeJong P., Dickson M., Gordon D., Eichler E.E., Pennacchio L.A., Richardson P., Stubbs L., Rokhsar D.S., Myers R.M., Rubin E.M., Lucas S.M. Nature 428:529-535(2004) [PubMed: 15057824] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
[4]	"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)." The MGC Project Team Genome Res. 14:2121-2127(2004) [PubMed: 15489334] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA]. Tissue: Brain.
[5]	"Identification of the glycosylated sequons of human myelin-associated glycoprotein." Burger D., Pidoux L., Steck A.J. Biochem. Biophys. Res. Commun. 197:457-464(1993) [PubMed: 7505568] [Abstract] Cited for: GLYCOSYLATION AT ASN-99; ASN-106; ASN-223; ASN-246; ASN-315; ASN-406; ASN-450 AND ASN-454, LACK OF GLYCOSYLATION AT ASN-332.
+	Additional computationally mapped references.

Web resourcesHide

Functional Glycomics Gateway - Glycan Binding

Siglec-4

Cross-referencesHide

Sequence databases
EMBL GenBank DDBJ	M29273 mRNA. Translation: AAA59545.1. AC002132 Genomic DNA. Translation: AAB58805.1. BC053347 mRNA. Translation: AAH53347.1.
IPI	IPI00026237.
PIR	A61084.
RefSeq	NP_002352.1. NP_542167.1.
UniGene	Hs.643440
3D structure databases
ModBase	Search...
Protein-protein interaction databases
STRING	P20916.
PTM databases
PhosphoSite	P20916.
Proteomic databases
PRIDE	P20916.
Genome annotation databases
Ensembl	ENST00000262624; ENSP00000262624; ENSG00000105695; Homo sapiens. [Genome view]
GeneID	4099.
KEGG	hsa:4099.
UCSC	uc002nyy.1. human.
Organism-specific databases
CTD	4099.
GeneCards	GC19P040474.
HGNC	HGNC:6783. MAG.
HPA	CAB009345. HPA012499.
MIM	159460. gene.
PharmGKB	PA30541.
GenAtlas	Search...
Phylogenomic databases
eggNOG	prNOG09606.
HOVERGEN	HBG006317.
InParanoid	P20916.
OMA	IINTPNI.
OrthoDB	EOG9P5NVG.
PhylomeDB	P20916.
Enzyme and pathway databases
Pathway_Interaction_DB	p75ntrpathway. p75(NTR)-mediated signaling.
Reactome	REACT_11061. Signalling by NGF. REACT_604. Hemostasis. REACT_6900. Signaling in Immune system.
Gene expression databases
ArrayExpress	P20916.
Bgee	P20916.
CleanEx	HS_MAG.
Genevestigator	P20916.
GermOnline	ENSG00000105695. Homo sapiens.
Family and domain databases
InterPro	IPR013162. CD80_C2-set. IPR007110. Ig-like. IPR013783. Ig-like_fold. IPR013098. Ig_I-set. IPR003599. Ig_sub. IPR003598. Ig_sub2. [Graphical view]
Gene3D	G3DSA:2.60.40.10. Ig-like_fold. 3 hits.
Pfam	PF08205. C2-set_2. 1 hit. PF07679. I-set. 2 hits. [Graphical view]
SMART	SM00409. IG. 1 hit. SM00408. IGc2. 2 hits. [Graphical view]
PROSITE	PS50835. IG_LIKE. 3 hits. [Graphical view]
ProtoNet	Search...
Other Resources
NextBio	16074.
PMAP-CutDB	P20916.
SOURCE	Search...

Entry informationHide

Entry name

MAG_HUMAN

Accession

Primary (citable) accession number: P20916

Entry history

Integrated into UniProtKB/Swiss-Prot:	February 1, 1991
Last sequence update:	February 1, 1991
Last modified:	July 13, 2010
This is version 114 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

HPI (Human Proteome Initiative)

Disclaimer

Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care.