{PDOC00933}
{PS01213; GLOBIN_FAM_2}
{BEGIN}
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* Protozoan/cyanobacterial globins signature *
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Globins are heme-containing  proteins involved in  binding and/or transporting
oxygen [1]. Almost all globins belong to a large family (see <PDOC00793>), the
only exceptions  are  the  following proteins which form a family of their own
[2,3,4]:

 - Monomeric  hemoglobins  from the protozoan Paramecium caudatum, Tetrahymena
   pyriformis and Tetrahymena thermophila.
 - Cyanoglobins  from  the  cyanobacteria Nostoc commune and Synechocystis PCC
   6803.
 - Globins  LI637  and  LI410  from  the chloroplast of the alga Chlamydomonas
   eugametos.
 - Mycobacterium tuberculosis globins glbN and glbO.

These proteins  contain a conserved histidine which could be involved in heme-
binding. As a signature pattern, we use a conserved region that ends with this
residue.

-Consensus pattern: F-[LF]-x(4)-[GE]-G-[PAT]-x(2)-[YW]-x-[GSE]-[KRQAE]-x(1,5)-
                    [LIVM]-x(3)-H
                    [The H may be a heme ligand]
-Sequences known to belong to this class detected by the pattern: ALL.
-Other sequence(s) detected in Swiss-Prot: NONE.
-Last update: April 2006 / Pattern revised.

[ 1] Concise Encyclopedia Biochemistry, Second Edition, Walter de Gruyter,
     Berlin New-York (1988).
[ 2] Takagi T.
     Curr. Opin. Struct. Biol. 3:413-418(1993).
[ 3] Couture M., Chamberland H., St-Pierre B., Lafontaine J., Guertin M.
     "Nuclear genes encoding chloroplast hemoglobins in the unicellular
     green alga Chlamydomonas eugametos."
     Mol. Gen. Genet. 243:185-197(1994).
     PubMed=8177215
[ 4] Couture M., Das T.K., Savard P.Y., Ouellet Y., Wittenberg J.B.,
     Wittenberg B.A., Rousseau D.L., Guertin M.
     "Structural investigations of the hemoglobin of the cyanobacterium
     Synechocystis PCC6803 reveal a unique distal heme pocket."
     Eur. J. Biochem. 267:4770-4780(2000).
     PubMed=10903511

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