Endoplasmic reticulum mannosyl-oligosaccharide 1,2-alpha-mannosidase

NameEndoplasmic reticulum mannosyl-oligosaccharide 1,2-alpha-mannosidase
Synonyms
  • 3.2.1.113
  • ER alpha-1,2-mannosidase
  • ER mannosidase 1
  • ERMan1
  • Man9GlcNAc2-specific-processing alpha-mannosidase
  • Mannosidase alpha class 1B member 1
Gene NameMAN1B1
OrganismHuman
Amino acid sequence
>lcl|BSEQ0019114|Endoplasmic reticulum mannosyl-oligosaccharide 1,2-alpha-mannosidase
MAACEGRRSGALGSSQSDFLTPPVGGAPWAVATTVVMYPPPPPPPHRDFISVTLSFGENY
DNSKSWRRRSCWRKWKQLSRLQRNMILFLLAFLLFCGLLFYINLADHWKALAFRLEEEQK
MRPEIAGLKPANPPVLPAPQKADTDPENLPEISSQKTQRHIQRGPPHLQIRPPSQDLKDG
TQEEATKRQEAPVDPRPEGDPQRTVISWRGAVIEPEQGTELPSRRAEVPTKPPLPPARTQ
GTPVHLNYRQKGVIDVFLHAWKGYRKFAWGHDELKPVSRSFSEWFGLGLTLIDALDTMWI
LGLRKEFEEARKWVSKKLHFEKDVDVNLFESTIRILGGLLSAYHLSGDSLFLRKAEDFGN
RLMPAFRTPSKIPYSDVNIGTGVAHPPRWTSDSTVAEVTSIQLEFRELSRLTGDKKFQEA
VEKVTQHIHGLSGKKDGLVPMFINTHSGLFTHLGVFTLGARADSYYEYLLKQWIQGGKQE
TQLLEDYVEAIEGVRTHLLRHSEPSKLTFVGELAHGRFSAKMDHLVCFLPGTLALGVYHG
LPASHMELAQELMETCYQMNRQMETGLSPEIVHFNLYPQPGRRDVEVKPADRHNLLRPET
VESLFYLYRVTGDRKYQDWGWEILQSFSRFTRVPSGGYSSINNVQDPQKPEPRDKMESFF
LGETLKYLFLLFSDDPNLLSLDAYVFNTEAHPLPIWTPA
Number of residues699
Molecular Weight79579.18
Theoretical pI7.8
GO Classification
Functions
  • mannosyl-oligosaccharide 1,2-alpha-mannosidase activity
  • calcium ion binding
Processes
  • mannose trimming involved in glycoprotein ERAD pathway
  • protein alpha-1,2-demannosylation
  • protein folding
  • trimming of terminal mannose on B branch
  • cellular protein metabolic process
  • post-translational protein modification
  • protein N-linked glycosylation via asparagine
  • protein N-linked glycosylation
  • ER-associated ubiquitin-dependent protein catabolic process
  • oligosaccharide metabolic process
  • N-glycan processing
  • endoplasmic reticulum mannose trimming
  • glycoprotein ERAD pathway
Components
  • endoplasmic reticulum membrane
  • Golgi apparatus
  • integral component of membrane
  • extracellular vesicle
  • endoplasmic reticulum quality control compartment
  • membrane
  • endoplasmic reticulum
General FunctionMannosyl-oligosaccharide 1,2-alpha-mannosidase activity
Specific FunctionInvolved in glycoprotein quality control targeting of misfolded glycoproteins for degradation. It primarily trims a single alpha-1,2-linked mannose residue from Man(9)GlcNAc(2) to produce Man(8)GlcNAc(2), but at high enzyme concentrations, as found in the ER quality control compartment (ERQC), it further trims the carbohydrates to Man(5-6)GlcNAc(2).
Pfam Domain Function
Transmembrane Regions85-105
GenBank Protein ID6066222
UniProtKB IDQ9UKM7
UniProtKB Entry NameMA1B1_HUMAN
Cellular LocationEndoplasmic reticulum membrane
Gene sequence
>lcl|BSEQ0019115|Endoplasmic reticulum mannosyl-oligosaccharide 1,2-alpha-mannosidase (MAN1B1)
ATGGCTGCCTGCGAGGGCAGGAGAAGCGGAGCTCTCGGTTCCTCTCAGTCGGACTTCCTG
ACGCCGCCAGTGGGCGGGGCCCCTTGGGCCGTCGCCACCACTGTAGTCATGTACCCACCG
CCGCCGCCGCCGCCTCATCGGGACTTCATCTCGGTGACGCTGAGCTTTGGCGAGAACTAT
GACAACAGCAAGAGTTGGCGGCGGCGCTCGTGCTGGAGGAAATGGAAGCAACTGTCGAGA
TTGCAGCGGAATATGATTCTCTTCCTCCTTGCCTTTCTGCTTTTCTGTGGACTCCTCTTC
TACATCAACTTGGCTGACCATTGGAAAGCTCTGGCTTTCAGGCTAGAGGAAGAGCAGAAG
ATGAGGCCAGAAATTGCTGGGTTAAAACCAGCAAATCCACCCGTCTTACCAGCTCCTCAG
AAGGCGGACACCGACCCTGAGAACTTACCTGAGATTTCGTCACAGAAGACACAAAGACAC
ATCCAGCGGGGACCACCTCACCTGCAGATTAGACCCCCAAGCCAAGACCTGAAGGATGGG
ACCCAGGAGGAGGCCACAAAAAGGCAAGAAGCCCCTGTGGATCCCCGCCCGGAAGGAGAT
CCGCAGAGGACAGTCATCAGCTGGAGGGGAGCGGTGATCGAGCCTGAGCAGGGCACCGAG
CTCCCTTCAAGAAGAGCAGAAGTGCCCACCAAGCCTCCCCTGCCACCGGCCAGGACACAG
GGCACACCAGTGCATCTGAACTATCGCCAGAAGGGCGTGATTGACGTCTTCCTGCATGCA
TGGAAAGGATACCGCAAGTTTGCATGGGGCCATGACGAGCTGAAGCCTGTGTCCAGGTCC
TTCAGTGAGTGGTTTGGCCTCGGTCTCACACTGATCGACGCGCTGGACACCATGTGGATC
TTGGGTCTGAGGAAAGAATTTGAGGAAGCCAGGAAGTGGGTGTCGAAGAAGTTACACTTT
GAAAAGGACGTGGACGTCAACCTGTTTGAGAGCACGATCCGCATCCTGGGGGGGCTCCTG
AGTGCCTACCACCTGTCTGGGGACAGCCTCTTCCTGAGGAAAGCTGAGGATTTTGGAAAT
CGGCTAATGCCTGCCTTCAGAACACCATCCAAGATTCCTTACTCGGATGTGAACATCGGT
ACTGGAGTTGCCCACCCGCCACGGTGGACCTCCGACAGCACTGTGGCCGAGGTGACCAGC
ATTCAGCTGGAGTTCCGGGAGCTCTCCCGTCTCACAGGGGATAAGAAGTTTCAGGAGGCA
GTGGAGAAGGTGACACAGCACATCCACGGCCTGTCTGGGAAGAAGGATGGGCTGGTGCCC
ATGTTCATCAATACCCACAGTGGCCTCTTCACCCACCTGGGCGTATTCACGCTGGGCGCC
AGGGCCGACAGCTACTATGAGTACCTGCTGAAGCAGTGGATCCAGGGCGGGAAGCAGGAG
ACACAGCTGCTGGAAGACTACGTGGAAGCCATCGAGGGTGTCAGAACGCACCTGCTGCGG
CACTCCGAGCCCAGTAAGCTCACCTTTGTGGGGGAGCTTGCCCACGGCCGCTTCAGTGCC
AAGATGGACCACCTGGTGTGCTTCCTGCCAGGGACGCTGGCTCTGGGCGTCTACCACGGC
CTGCCCGCCAGCCACATGGAGCTGGCCCAGGAGCTCATGGAGACTTGTTACCAGATGAAC
CGGCAGATGGAGACGGGGCTGAGTCCCGAGATCGTGCACTTCAACCTTTACCCCCAGCCG
GGCCGTCGGGACGTGGAGGTCAAGCCAGCAGACAGGCACAACCTGCTGCGGCCAGAGACC
GTGGAGAGCCTGTTCTACCTGTACCGCGTCACAGGGGACCGCAAATACCAGGACTGGGGC
TGGGAGATTCTGCAGAGCTTCAGCCGATTCACACGGGTCCCCTCGGGTGGCTATTCTTCC
ATCAACAATGTCCAGGATCCTCAGAAGCCCGAGCCTAGGGACAAGATGGAGAGCTTCTTC
CTGGGGGAGACGCTCAAGTATCTGTTCTTGCTCTTCTCCGATGACCCAAACCTGCTCAGC
CTGGATGCCTACGTGTTCAACACCGAAGCCCACCCTCTGCCTATCTGGACCCCTGCCTAG
GenBank Gene IDAF148509
GeneCard IDNot Available
GenAtlas IDMAN1B1
HGNC IDHGNC:6823
Chromosome Location9
Locus9q34
References
  1. Tremblay LO, Herscovics A: Cloning and expression of a specific human alpha 1,2-mannosidase that trims Man9GlcNAc2 to Man8GlcNAc2 isomer B during N-glycan biosynthesis. Glycobiology. 1999 Oct;9(10):1073-8. 10521544
  2. Gonzalez DS, Karaveg K, Vandersall-Nairn AS, Lal A, Moremen KW: Identification, expression, and characterization of a cDNA encoding human endoplasmic reticulum mannosidase I, the enzyme that catalyzes the first mannose trimming step in mammalian Asn-linked oligosaccharide biosynthesis. J Biol Chem. 1999 Jul 23;274(30):21375-86. 10409699
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