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9.A.75.1.1
The MHCII complex of three proteins, DQ alpha-1, DQ beta-1 (which form a heterodimer) and a CD75 homotrimer that together form a nanomer with 3 copies of the MHCII dimer.  It transports antigenic peptides to the cell surface (Wosen et al. 2018).  The structure, topology, and dynamics of membrane-inserted polypeptides and lipids have been examined by solid-state NMR spectroscopy, specifically with respect to the transmembrane domains of the DQ Beta-1 subunit of the MHC II receptor and the COP I protein, p24 (Salnikov et al. 2019).

Accession Number:P01909
Protein Name:HLA class II histocompatibility antigen, DQ alpha 1 chain
Length:254
Molecular Weight:27805.00
Species:Homo sapiens (Human) [9606]
Number of TMSs:1
Location1 / Topology2 / Orientation3: Cell membrane1 / Single-pass type I membrane protein2
Substrate peptide

Cross database links:

Structure:
1JK8   1S9V   2NNA   4GG6   4OZF   4OZG   4OZH   4OZI   5KSA   5KSB   [...more]

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MILNKALMLG ALALTTVMSP CGGEDIVADH VASYGVNLYQ SYGPSGQYTH EFDGDEQFYV 
61:	DLGRKETVWC LPVLRQFRFD PQFALTNIAV LKHNLNSLIK RSNSTAATNE VPEVTVFSKS 
121:	PVTLGQPNIL ICLVDNIFPP VVNITWLSNG HSVTEGVSET SFLSKSDHSF FKISYLTLLP 
181:	SAEESYDCKV EHWGLDKPLL KHWEPEIPAP MSELTETVVC ALGLSVGLVG IVVGTVFIIR 
241:	GLRSVGASRH QGPL