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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P08397: Variant p.Gln34Pro

Porphobilinogen deaminase
Gene: HMBS
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Variant information Variant position: help 34 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Glutamine (Q) to Proline (P) at position 34 (Q34P, p.Gln34Pro). 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: help Change from medium size and polar (Q) to medium size and hydrophobic (P) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -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: help In AIP; severely decreased hydroxymethylbilane synthase activity. Any additional useful information about the variant.


Sequence information Variant position: help 34 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 361 The length of the canonical sequence.
Location on the sequence: help NSPKMRVIRVGTRKSQLARI Q TDSVVATLKASYPGLQFEII 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences.
Human                         NSPKMRVIRVGTRKSQLARIQTDSVVATLKASYPGLQFEII

Mouse                         NGSKMRVIRVGTRKSQLARIQTDTVVAMLKALYPGIQFEII

Rat                           NGSMMRVIRVGTRKSQLARIQTDTVVAMLKTLYPGIQFEII

Bovine                        DTPKMRVIRVGTRKSQLARIQTDSVVATLKALYPGLQFEII

Slime mold                    SITKRDKVIIGSRKSQLAMLQTEWVRDRIQELNPGIIVEIK

Baker's yeast                 MGPE--TLHIGGRKSKLAVIQSNHVLKLIEEKYPDYDCKVF

Fission yeast                 -MPSCTSFPIGTRKSKLAVIQSEIIREELEKHYPHLEFPII

Sequence annotation in neighborhood: help 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 2 – 361 Porphobilinogen deaminase
Modified residue 15 – 15 Phosphoserine
Mutagenesis 26 – 26 R -> A. Loss of hydroxymethylbilane synthase activity.
Mutagenesis 34 – 34 Q -> A. Loss of hydroxymethylbilane synthase activity.
Helix 29 – 45



Literature citations
Identification and characterization of hydroxymethylbilane synthase mutations causing acute intermittent porphyria: evidence for an ancestral founder of the common G111R mutation.
De Siervi A.; Rossetti M.V.; Parera V.E.; Astrin K.H.; Aizencang G.I.; Glass I.A.; Batlle A.M.C.; Desnick R.J.;
Am. J. Med. Genet. 86:366-375(1999)
Cited for: VARIANTS AIP PRO-34; ARG-111; TRP-173; TRP-201; 329-LEU--GLN-332 DEL AND SER-335; Acute intermittent porphyria in Sweden. Molecular, functional and clinical consequences of some new mutations found in the porphobilinogen deaminase gene.
Floderus Y.; Shoolingin-Jordan P.M.; Harper P.;
Clin. Genet. 62:288-297(2002)
Cited for: VARIANTS AIP CYS-26; HIS-26; VAL-86; PRO-92; GLY-99; ARG-111; THR-113; GLN-173; ASN-178; GLN-225; GLY-225; TYR-256; ASP-260 AND PRO-343;
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.