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UniProtKB/Swiss-Prot Q92521: Variant p.Ala388Pro

GPI mannosyltransferase 3
Gene: PIGB
Variant information

Variant position:  388
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  LP/P [Disclaimer]
The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance

Residue change:  From Alanine (A) to Proline (P) at position 388 (A388P, p.Ala388Pro).
Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.

Physico-chemical properties:  Change from small size and hydrophobic (A) to medium size and hydrophobic (P)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -1
The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Variant description:  In DEE80; decreased protein levels; decreased cell surface presence of GPI-anchored proteins.
Any additional useful information about the variant.



Sequence information

Variant position:  388
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  554
The length of the canonical sequence.

Location on the sequence:   PFCMVFCGYSLTHLKTWKKP  A LSFLFLSNLFLALYTGLVHQ
The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.

Residue conservation: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         PFCMVFCGYSLTHLKT-------WKKPALSFLFLSNLFLALYTGLVHQ

Mouse                         PFCMVFCGYSLAHLKT-------WRKAALSFLLLSNVPLAF

Bovine                        PFCMVFCGYSLNNLKT-------WKKPALSFLFLSNMLLAL

Xenopus laevis                PVCMVFCGFSFSNLKR-------WKKAAVGFLVLSNLFPAL

Zebrafish                     PFCMIFCGLSLAKLQA-------WRKAAAGALLLFNLCPAL

Drosophila                    PLCLYVITDALSRWSIRASSTMLWTTALV--ILVGNVMPAW

Sequence annotation in neighborhood:  
The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.

TypePositionsDescription
Chain 1 – 554 GPI mannosyltransferase 3
Transmembrane 387 – 407 Helical


Literature citations

Mutations in PIGB Cause an Inherited GPI Biosynthesis Defect with an Axonal Neuropathy and Metabolic Abnormality in Severe Cases.
Murakami Y.; Nguyen T.T.M.; Baratang N.; Raju P.K.; Knaus A.; Ellard S.; Jones G.; Lace B.; Rousseau J.; Ajeawung N.F.; Kamei A.; Minase G.; Akasaka M.; Araya N.; Koshimizu E.; van den Ende J.; Erger F.; Altmueller J.; Krumina Z.; Strautmanis J.; Inashkina I.; Stavusis J.; El-Gharbawy A.; Sebastian J.; Puri R.D.; Kulshrestha S.; Verma I.C.; Maier E.M.; Haack T.B.; Israni A.; Baptista J.; Gunning A.; Rosenfeld J.A.; Liu P.; Joosten M.; Rocha M.E.; Hashem M.O.; Aldhalaan H.M.; Alkuraya F.S.; Miyatake S.; Matsumoto N.; Krawitz P.M.; Rossignol E.; Kinoshita T.; Campeau P.M.;
Am. J. Hum. Genet. 105:384-394(2019)
Cited for: VARIANTS DEE80 GLN-71; PRO-90; 131-LEU--PHE-554 DEL; HIS-155; HIS-232; ARG-CYS-GLN-TRP-282 INS; LEU-286; PRO-388; ARG-407 AND MET-537; CHARACTERIZATION OF VARIANTS DEE80 GLN-71; HIS-232; ARG-CYS-GLN-TRP-282 INS; LEU-286; PRO-388 AND ARG-407;

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